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Manual Compaq RS-232C

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  • Compaq RS-232C - page 1

    COM- 2(PC)F RS-232C (2ch) Serial I/O Board User ’ s Guide ...

  • Compaq RS-232C - page 2

    COM-2(PC)F i Copyright Copyright 1996 CONTEC Co., LTD. ALL RIGHTS RESERVED No part of this document may be copied or reproduced in any form by any means without prior written consent of CONTEC Co., LTD. CONTEC Co., LTD. makes no commitment to update or keep current the information contained in this document. The information in this document is subj ...

  • Compaq RS-232C - page 3

    COM-2(PC)F ii Product Configuration - COM - 2 (PC) F Board …1 - Sample Program Diskette (3.5inch/1.44MB) …1 - User's Guide ( T his B ooklet)…1 Unpacking: This board is specially packed in an anti-static bag to prevent damage in shipping. Check the contents to make sure that you have everything listed above. If you do not have all the ite ...

  • Compaq RS-232C - page 4

    COM-2(PC)F iii Table of Contents Copyright ............................................................................ i Trademarks ........................................................................ i Product Configuration ..................................................... ii 1. Introduction ............................................... ...

  • Compaq RS-232C - page 5

    COM-2(PC)F iv Mounting Method ............................................................ 28 Connecting the External Devices ................................... 31 Connecting the Cable ...................................................... 32 4. System Reference .................................................... 33 Specifications ............... ...

  • Compaq RS-232C - page 6

    COM-2(PC)F v List of Figures Figure 3.1. Names of Board Components and Default Factory Settings ..................................................................... 23 Figure 3.2. I/O Address DIP Switch ............................................ 25 Figure 3.3. Interrupt Level Settings ............................................. 26 Figure 3.4. ...

  • Compaq RS-232C - page 7

    COM-2(PC)F vi Figure 6.11. Flowchart of Sample Program 9 ................................ 53 Figure 6.12. Flowchart of Sample Program10 ............................... 54 Figure 6.13. Flowchart of Sample Program 11 .............................. 55 Figure 6.14. IVR Bit Function in Enhanced Mode ........................ 61 Figure 6.15. Difference in ...

  • Compaq RS-232C - page 8

    COM-2(PC)F vii List of Tables Table 2.1. COM Port Support for V arious Programming Languages ................................................................. 21 Table 3.1. I/O Address Settings ................................................. 25 Table 3.2. Example Compatible Mode Settings ......................... 27 Table 4.1. Specifications .... ...

  • Compaq RS-232C - page 9

    COM-2(PC)F viii ...

  • Compaq RS-232C - page 10

    Introduction COM-2(PC)F 1 1. Introduction About the COM- 2(PC)F Board The COM- 2(PC)F is an IBM PC/ A T ISA-Bus add-on interface board for multi-channel RS-232C asynchronous communications. It features two serial communication ports and a programmable communication rate ranging from 50 to 115,200 bps for communication or modem control. Support Soft ...

  • Compaq RS-232C - page 11

    Introduction COM-2(PC)F 2 Limited Three- Y ear Warranty CONTEC Interface boards are warranted by CONTEC Co., LTD to be free from defects in material and workmanship for up to three years from the date of purchase by the original purchaser. Repair will be free of charge only when this device is returned freight prepaid with a copy of the original in ...

  • Compaq RS-232C - page 12

    Introduction COM-2(PC)F 3 About the Manual This manual consists of the following chapters : Chapter 1 Introduction Chapter 2 How to Use the Board Chapter 3 Hardware Setup Chapter 4 I/O Ports and Registers Chapter 5 System Reference Chapter 6 Troubleshooting Chapter 7 Index ...

  • Compaq RS-232C - page 13

    Introduction COM-2(PC)F 4 ...

  • Compaq RS-232C - page 14

    How to Use the Board COM-2(PC)F 5 2. How to Use the Board Compatible Mode and Enhanced Mode The COM- 2(PC)F supports Compatible mode and Enhanced mode. In Compatible mode, the board channels operate as standard PC serial ports. In Enhanced mode, the board operates under CONTEC's proprietary control procedures. Give full consideration to the fe ...

  • Compaq RS-232C - page 15

    How to Use the Board COM-2(PC)F 6 Operating under Windows Me/98 This section describes the procedure for using the board under Windows Me/98 and lists a number of points to note. Procedure When using the board under Windows Me/98, the OS must be set to recognize the I/O address and interrupt level used by the COM- 2(PC)F. In Windows Me/98, this is ...

  • Compaq RS-232C - page 16

    How to Use the Board COM-2(PC)F 7 Compatible Mode Installation Procedure 1 1. Set the operation mode (I/O address) and interrupt level for the COM- 2(PC)F. Set the COM- 2(PC)F switch and jumpers as described in Hardware Setup. Set an interrupt level that is not currently used by the computer. 2. Insert the COM- 2(PC)F in an expansion slot and turn ...

  • Compaq RS-232C - page 17

    How to Use the Board COM-2(PC)F 8 Compatible Mode Installation Procedure 2 1. Turn on the power to the PC without inserting the COM- 2(PC)F in an expansion slot. 2. After Windows Me/98 starts, select [Control Panel] from [My Computer] and start the [Add New Hardware]. 3. Clic k [Next >] in response to [To begin installing your new hardware, clic ...

  • Compaq RS-232C - page 18

    How to Use the Board COM-2(PC)F 9 Enhanced Mode Installation Procedure When it is used with Enhanced Mode, API- PAC(W32) of the option is necessar y . Refer to Help "HWINSTE.HLP" of the way of registering the hardware being attached to API- PAC(W32) for the way of installing it. Check Resources Always check the PC resources (I/O address a ...

  • Compaq RS-232C - page 19

    How to Use the Board COM-2(PC)F 10 Operating under Windows 95 This section describes the procedure for using the board under Windows 95 and lists a number of points to note. Procedure When using the board under Windows 95, the OS must be set to recognize the I/O address and interrupt level used by the COM- 2(PC)F. In Windows 95, this is called hard ...

  • Compaq RS-232C - page 20

    How to Use the Board COM-2(PC)F 11 Compatible Mode Installation Procedure 1 1. Set the operation mode (I/O address) and interrupt level for the COM- 2(PC)F. Set the COM- 2(PC)F switch and jumpers as described in Hardware Setup. Set an interrupt level that is not currently used by the computer. 2. Insert the COM- 2(PC)F in an expansion slot and turn ...

  • Compaq RS-232C - page 21

    How to Use the Board COM-2(PC)F 12 Compatible Mode Installation Procedure 2 1. Turn on the power to the PC without inserting the COM- 2(PC)F in an expansion slot. 2. After Windows 95 starts, select [Control Panel] from [My Computer] and start the [Add New Hardware]. 3. Click [Next >] in response to [To begin installing your new hardware, click N ...

  • Compaq RS-232C - page 22

    How to Use the Board COM-2(PC)F 13 Enhanced Mode Installation Procedure When it is used with Enhanced Mode, API- PAC(W32) of the option is necessar y . Refer to Help "HWINSTE.HLP" of the way of registering the hardware being attached to API- PAC(W32) for the way of installing it. Check Resources Always check the PC resources (I/O address ...

  • Compaq RS-232C - page 23

    How to Use the Board COM-2(PC)F 14 Operating under Windows 2000 This section describes the procedure for using the board under Windows 2000 and lists a number of points to note. Procedure When using the board under Windows 2000, the OS must be set to recognize the I/O address and interrupt level used by the COM- 2(PC)F. In Windows 2000, this is cal ...

  • Compaq RS-232C - page 24

    How to Use the Board COM-2(PC)F 15 Compatible Mode Installation Procedure 1 It can ’ t be used with Compatible Mode when API- SIO(98/PC)NT of packing together is used for API-PAC(W32). 1. Set the operation mode (I/O address) and i nterrupt level for the COM- 2(PC)F. Set the COM- 2(PC)F switch and jumpers as described in Hardware Setup. Set an int ...

  • Compaq RS-232C - page 25

    How to Use the Board COM-2(PC)F 16 Compatible Mode Installation Procedure 2 It can ’ t be used with Compatible Mode when API- SIO(98/PC)NT of packing together is used for API-PAC(W32). 1. Turn on the power to the PC without inserting the COM- 2(PC)F in an expansion slot. 2. After Windows 2000 starts, select [Control Panel] from [My Computer] and ...

  • Compaq RS-232C - page 26

    How to Use the Board COM-2(PC)F 17 Enhanced Mode Installation Procedure When it is used with Enhanced Mode, API- PAC(W32) of the option is necessar y . Refer to Help "HWINSTE.HLP" of the way of registering the hardware being attached to API- PAC(W32) for the way of installing it. Check Resources Always check the PC resources (I/O address ...

  • Compaq RS-232C - page 27

    How to Use the Board COM-2(PC)F 18 Operating under Windows NT This section describes the procedure for using the board under Windows NT and lists a number of points to note. Procedure First, set the operation mode (I/O address) and interrupt level for the COM- 2(PC)F. Set the COM- 2(PC)F switch and jumpers as described in Hardware Setup. When using ...

  • Compaq RS-232C - page 28

    How to Use the Board COM-2(PC)F 19 Operating under Windows 3.1 This section describes the procedure for using the board under Windows 3.1 and lists a number of points to note. Procedure First, set the operation mode (I/O address) and interrupt level for the COM- 2(PC)F. Set the COM- 2(PC)F switch and jumpers as described in Hardware Setup. When usi ...

  • Compaq RS-232C - page 29

    How to Use the Board COM-2(PC)F 20 Operating under MS-DOS This section describes the procedure for using the board under MS-DOS and lists a number of points to note. Procedure First, set the operation mode (I/O address) and interrupt level for the COM- 2(PC)F. Set the COM- 2(PC)F switch and jumpers as described in Hardware Setup. When using the boa ...

  • Compaq RS-232C - page 30

    How to Use the Board COM-2(PC)F 21 Note! When used in Compatible mode, COM3 and COM4 are not supported by some programming languages. Check the specifications of the language you are using. T able 2.1. lists the COM ports supported by a number of common programming languages. Table 2.1. COM Port Support for V arious Programming Languages Language C ...

  • Compaq RS-232C - page 31

    How to Use the Board COM-2(PC)F 22 ...

  • Compaq RS-232C - page 32

    Hardware Setup COM-2(PC)F 23 3. Hardware Setup Names of Board Components Figure 3.1. shows the names of various board components. The switch and jumper settings shown in the figure are the default factory settings. Figure 3.1. Names of Board Components and Default Factory Settings ...

  • Compaq RS-232C - page 33

    Hardware Setup COM-2(PC)F 24 I/O Address Setting The board is an I/O device controlled by I/O instructions from the PC. I/O devices include expansion boards and devices inside the PC. The various devices are identified by their I/O addresses. I/O addresses are represented as four digit hexadecimal values (e.g. 02A0H) and act as the ID number for ea ...

  • Compaq RS-232C - page 34

    Hardware Setup COM-2(PC)F 25 Setting Procedure The I/O address is set using a DIP switch (SW1) on the board. S W 1 1 2 3 4 O F F M OD E 1 2 3 4 Figure 3.2. I/O Address DIP Switch Table 3.1. I/O Address Settings SW1 Interrupt Vector Bit 1 Bit 2 Register Address ON Enhanced 1A0~1A7 1BF OFF Enhanced 2A0~2A7 2BF ON COM3 3E8~3EF --- OFF COM1 3F8~3FF --- ...

  • Compaq RS-232C - page 35

    Hardware Setup COM-2(PC)F 26 Interrupt Level Setting The signal from the LSI (NS16550 equivalent) on the board can be used as an interrupt request signal based on the JP1, JP2, and JP3 settings. Note! When using interrupts, set an interrupt level that is not used by any other device. Setting Procedure When not Using Interrupts Place a short connect ...

  • Compaq RS-232C - page 36

    Hardware Setup COM-2(PC)F 27 Table 3.2. lists the I/O address and standard interrupt level settings for COM1 to COM4 (Compatible mode). Table 3.2. Example Compatible Mode Settings Port I/O Address COM1 3F8~3FF IRQ4 COM2 2F8~2FF IRQ3 COM3 3E8~3EF IRQ4 *1 *1 On the IBM PS/55Z and similar, COM4 2E8~2EF IRQ3 COM3 uses IRQ3. Interrupt Level Note! If usi ...

  • Compaq RS-232C - page 37

    Hardware Setup COM-2(PC)F 28 Mounting Method There are many kinds of boards that can be mounted in a computer's extension slots, however the mounting method is identical for any slot. Before starting (1) Set the Power switch to OFF. (2) Unplug the power cable from the AC outlet. Mounting the board (1) Remove the screws from the rear of the com ...

  • Compaq RS-232C - page 38

    Hardware Setup COM-2(PC)F 29 (3) Remove th e screw retaining the cover of the slot where the board is to be mounted, and remove the cover from the rear panel. Figure 3.6. Expansion Slot Cover Caution! T o prevent a discharge of static electricity from damaging the board, it is important to ground yourself. Hold the packaged board in one hand and to ...

  • Compaq RS-232C - page 39

    Hardware Setup COM-2(PC)F 30 (7) Ancho r the board with the scre w . Use the screw set aside in step 3. Tighten so that the board is held in place. Figure 3.7. Anchoring the COM- 2(PC)F (8) Replace the computer cover. (9) Connect the power cord. ...

  • Compaq RS-232C - page 40

    Hardware Setup COM-2(PC)F 31 Connecting the External Devices Connecting the COM- 2(PC)F board to external devices is via two 9-pin D-SUB connector (male) on the board. C N 1 C N 2 5 9 1 6 5 1 9 6 O n - b o a r d C o n n e c t o r : D E L C - J9 P A F - 20 L 9 ( M a l e ) [ m f d . b y J AE ] A pp li c a t i o n C o nn e c t o r : 17J E - 13090 - 02 ...

  • Compaq RS-232C - page 41

    Hardware Setup COM-2(PC)F 32 Connecting the Cable The RS-232C interface requires that you use a different type of cable depending on the type of device being connected. For example, modem connections and computer (PC) connections require different cables. Accordingl y , check the specifications of the external device to which you are connecting and ...

  • Compaq RS-232C - page 42

    System Reference COM-2(PC)F 33 4. System Reference Specifications Table 4.1. Specifications Item Specification Number of Channels 2 Input Type RS-232C External connectors Two 9-pin D-SUB connector (Male) Transfer Method Asychronous serial transfer Baud Rate 50~115,200bps *1 5, 6, 7, 8 bits 1, 1.5, 2 stop bits *1 Parity heck Even, Odd, Non-parity *1 ...

  • Compaq RS-232C - page 43

    System Reference COM-2(PC)F 34 Circuitry Diagrams T X D , R T S , D T R R X D , C T S , D S R S N 7 5188 S N 751 89 15 p F Figure 4.1. Circuitry Diagrams Block Diagram The following is a block diagram of the COM- 2(PC)F interface board. A DD R E SS D EC OD ER D A T A B U FF ER D a t a B u s ( D 7 ~ D 0 ) I B M - P C / A T B U S C N T R O L B U FF E ...

  • Compaq RS-232C - page 44

    Troubleshooting COM-2(PC)F 35 5. Troubleshooting If you are having trouble with your board or program, answer the following questions to see if you can find the problem. QUESTIONS: STEPS TO TAKE Is the pilot light on? The system must be turned on and the power supply must be working. Check the main power switch and the power suppl y. Did the system ...

  • Compaq RS-232C - page 45

    Troubleshooting COM-2(PC)F 36 Does the sample program work? Check the following: - Signals are connected to the correct pins. - Pin connections on the I/O cables are secure. - Signals are present at the e xternal connectors. - Try using the COM- 2(PC)F board with other non-essential boards removed. Remove other boards one by one, checking the COM- ...

  • Compaq RS-232C - page 46

    Troubleshooting COM-2(PC)F 37 3. DOS Version. 4. Name of the CONTEC board that you are using. 5. N ames of other boards in the computer. 6. I/O addresses for the CONTEC board and all other boards. 7. Interrupt levels for the CONTEC board and all other boards. 8. DMA channels for the CONTEC board and all other boards (if applicable). 9. The programm ...

  • Compaq RS-232C - page 47

    Troubleshooting COM-2(PC)F 38 10. Different I/O addresses you have tried. 11. Are you using your own program or a CONTEC sample program. 12. List AUTOEXEC.B AT. 13. List CONFIG.SYS. ...

  • Compaq RS-232C - page 48

    Appendix COM-2(PC)F 39 6. Appendix A. Sample Programs (for MS-DOS) This section covers the sample programs that are supplied on the floppy disk included with this board. COM- 2(PC)F Diskette CONTEC supplies a sample program diskette with each COM- 2(PC)F board. This diskette contains sample programs to help you get started. Use the DOS DIR command ...

  • Compaq RS-232C - page 49

    Appendix COM-2(PC)F 40 Sample Programs The programs are written in GW-BASIC and Microsoft C. The sample programs transmit data entered from the keyboard and display received data on the screen. Table 6.1. lists the communications data format. The sample programs listed in Figure 6.1. are included on the floppy disk. Table 6.1. Data Format Parameter ...

  • Compaq RS-232C - page 50

    Appendix COM-2(PC)F 41 Notes! - All the sample programs must be run on a PC operating under MS-DOS. - Sample programs 3, 4, 6, and 10 cannot be used on a PC that already has COM1 and COM2 ports. Similarly, sample programs 11 cannot be used on a PC that already has COM3 and COM4 ports. - As sample programs 8 and 9 use half-duplex mode, they can only ...

  • Compaq RS-232C - page 51

    Appendix COM-2(PC)F 42 Switch and Jumper Settings Table 6.2. Switch and Jumper Settings of Sample Program 1, 2, and 5 I t e m I / O A dd r e ss ( S W 1 ) I n t e rr u p t L e v e l ( J P 1 , J P 2 , J P 3 ) 1 2 3 4 O F F S W 1 J P 1 J P 2 J P 3 9 3 4 5 6 7 1 0 11 1 2 1 4 1 5 N C 9 3 4 5 6 7 1 0 11 1 2 1 4 1 5 N C 9 3 4 5 6 7 1 0 11 1 2 1 4 1 5 N C ...

  • Compaq RS-232C - page 52

    Appendix COM-2(PC)F 43 Table 6.4. Switch and Jumper Settings of Sample Program 7 I t e m I / O A dd r e ss ( S W 1 ) I n t e rr u p t L e v e l ( J P 1 , J P 2 , J P 3 ) 1 2 3 4 O F F S W 1 J P 1 J P 2 J P 3 9 3 4 5 6 7 1 0 11 1 2 1 4 1 5 N C 9 3 4 5 6 7 1 0 11 1 2 1 4 1 5 N C 9 3 4 5 6 7 1 0 11 1 2 1 4 1 5 N C S e tt i n g s Table 6.5. Switch and ...

  • Compaq RS-232C - page 53

    Appendix COM-2(PC)F 44 Cable Connection When running the sample programs 1 to 11 (except 8 and 9), use the interconnection cable as shown in Figure 6.2. for connection with the mating device in the Compatible mode. For use in the Enhanced mode, on the other hand, use the cross cable or the interconnection configuration diagram in Figure 6.2. P i n ...

  • Compaq RS-232C - page 54

    Appendix COM-2(PC)F 45 Sample Program 1 This GW-BASIC sample program demonstrates the transmit-data capability of COM- 2(PC)F in Enhanced mode. First, it initializes the Asynchronous Communication Element (ACE) , then it transmits the data input from the keyboard to the external device through channel 1 (CN1). N o n e K e y I n K e y N o L i n e S ...

  • Compaq RS-232C - page 55

    Appendix COM-2(PC)F 46 Sample Program 2 This GW-BASIC sample program demonstrates the receive-data capability of COM- 2(PC)F in Enhanced mode. First, it initializes the ACE , then it transmits the data input from the external device to CRT through CN1. S e t B a u d R a t e G e n e r a t o r 1 S e t M o d e m C o n t r o l O u t p u t R e a d L i n ...

  • Compaq RS-232C - page 56

    Appendix COM-2(PC)F 47 Sample Program 3 This GW-BASIC sample program demonstrates the transmit-data capability of COM- 2(PC)F in Compatible mode. Using this [OPEN " COM1 : 9600, N, 8, 2, DS" AS #1] command opens the RS-232C communication file (COM1). It then writes the data input from the keyboard to COM1 through CN1. N o n e K e y I n K ...

  • Compaq RS-232C - page 57

    Appendix COM-2(PC)F 48 Sample Program 4 This GW-BASIC sample program demonstrates the receive-data capability of COM- 2(PC)F in Compatible mode. Using this [OPEN " COM1 : 9600, N, 8, 2, DS" AS #1] command opens the RS-232C communication file (COM1). It then reads the data from COM1 and outputs to CRT through CN1. Y e s N o S e t C o mm un ...

  • Compaq RS-232C - page 58

    Appendix COM-2(PC)F 49 Sample Program 5 This GW-BASIC sample program demonstrates the receive/transmit-data capability of COM- 2(PC)F in Enhanced mode. First, it initializes the ACE , it then receives the data input from the keyboard through CN1. Finally it outputs the data to C RT through CN2. Figure 6.7. Flowchart of Sample Program 5 1 1 S e t B ...

  • Compaq RS-232C - page 59

    Appendix COM-2(PC)F 50 Sample Program 6 This GW-BASIC sample program demonstrates the receive/transmit-data capability of COM- 2(PC)F in Compatible mode. Using the [OPEN " COM1 : 9600, N, 8, 2, DS" AS #1] command and the [OPEN "COM2 : 9600, N, 8, 2, DS" AS #2] command opens two RS-232C communication files (COM1 and COM2). The pr ...

  • Compaq RS-232C - page 60

    Appendix COM-2(PC)F 51 Sample Program 7 This GW-BASIC sample program demonstrates the receive/transmit-data capability of COM- 2(PC)F in Enhanced mode with interrupt input. It calls a machine language program to register and handle interrupt input. One channel's receive/transit- data routine is processed in the interrupt handler. The received ...

  • Compaq RS-232C - page 61

    Appendix COM-2(PC)F 52 Sample Program 8 [Half-duplex data transmission (Enhanced mode)] The sample program 8 enables initialization on ACE, data transmission in the transmission mode, and waits for the receive data in the receive mode. 1 N o t e : W a i t T i m e = ( s e c ) D a t a L e n g t h B a u d R a t e N o Y e s 1 L i n e S t a t u s D 6 b ...

  • Compaq RS-232C - page 62

    Appendix COM-2(PC)F 53 Sample Program 9 [Half-duplex data reception (Enhanced mode)] The sample program 9 enables initialization on ACE, receives 5-byte data; after transmission, the program enters the transmission mode for data transmission. N o Y e s 1 L i n e S t a t u s D 0 b i t = 1 S e t B a u d R a t e G e n e r a t o r 1 S e t I n t e rr u ...

  • Compaq RS-232C - page 63

    Appendix COM-2(PC)F 54 Sample Program 10 [Data transmission and reception (COM1, COM2 mode)] Sample program 10 uses the bios_serialcom ( ) function for MS-C. It first receives the data transmitted from COM1, and then receives the data at COM1 transmitted from COM2. Received data is displayed on the C RT. 1 C O M 1 I n i t i a l i z a t i o n 1 C O ...

  • Compaq RS-232C - page 64

    Appendix COM-2(PC)F 55 Sample Program 11 [Data transmission and reception (COM3, COM4 mode)] Sample program 11 uses the bios_serialcom ( ) function for MS-C. It first receives the data transmitted from COM3, and then receives the data at COM3 transmitted from COM4. Received data is displayed on the C RT. 1 C O M 3 I n i t i a li z a t i o n 1 C O M ...

  • Compaq RS-232C - page 65

    Appendix COM-2(PC)F 56 B. Notes on Developing Driver Software Internal Registers COM- 2(PC)F uses the NS16550 (National Semiconductor) as the Asynchronous Communication Element (ACE). Within the address range of each channel, the offset addresses 0 through 7 furnish access to the internal registers of each of the two ACE's. Table 6.6. shows ho ...

  • Compaq RS-232C - page 66

    Appendix COM-2(PC)F 57 Baud Rate Selection The COM- 2(PC)F board has one programmable baud rate generator for each of the two ACEs. The ACEs use a 1.8432MHz crystal oscillator as clock input. The baud rate generator takes the 1.8432MHz clock and divides it by a divisor from 1 to (2 16 - 1). The output frequency of the baud rate generator equals 16 ...

  • Compaq RS-232C - page 67

    Appendix COM-2(PC)F 58 LSI Recovery Time Due to the ever higher CPU clock rates used in PCs, restrictions apply when controlling a peripheral LSI device by software. Table 6.8. lists the LSIs used on CONTEC boards which require special consideration when accessing. Take note of the following point when accessing these LSIs. In PCs using i386 or ear ...

  • Compaq RS-232C - page 68

    Appendix COM-2(PC)F 59 Example program (for accessing an i8254 or equivalent) - Microsoft Macro Assembler OUT DX, AL ; Access to the i8254 IN AL, 2EFH ; Execute IN AL, 2EFH once to provide the recovery time - Microsoft C/C++ outp(port, byte); /* Access to the i8254 */ rt =inp(0x2ef); /* Execute rt=inp(0x2ef); once to provide the recovery time */ ...

  • Compaq RS-232C - page 69

    Appendix COM-2(PC)F 60 V arious Aspects of Interrupt Handling in Enhanced Mode and Compatible Mode Enhanced Mode When in Enhanced mode, two channels of the COM- 2(PC)F share the same interrupt request line. The interrupt levels can be set from IRQ3~IRQ7, IRQ9~IRQ12, IRQ14, and IRQ15 by setting JP1 before installing this board. Each channel's i ...

  • Compaq RS-232C - page 70

    Appendix COM-2(PC)F 61 O u t p u t P o r t 2 B F / 1 B F D 7 N o t U s e d G l o ba l I n t e rr u p t 0 : D i s ab l e 1 : E n a b l e D 6 D 5 D 4 D 3 D 2 D 1 D 0 I n p u t P o r t 2 B F / 1 B F D 7 N o t U s e d C H 1 I n t e r r u p t 0 : O cc u rr e d 1 : N o t O c c u rr e d D 6 D 5 D 4 D 3 D 2 D 1 D 0 C H 2 I n t e r r u p t 0 : O cc u rr e d ...

  • Compaq RS-232C - page 71

    Appendix COM-2(PC)F 62 C. The Details on NS16550 Table 6.9. NS16550's Register (Short from National Semiconductor's data book) < 1 / 2 > Register 0 DLAB = 0 0 DLAB = 0 1 DLAB = 0 2 2 3 Bit Receiver Transmitter Interrupt Interrupt FIFO Line No. Buffer Holding Enable Ident. Control Control Register Register Register Register Register ...

  • Compaq RS-232C - page 72

    Appendix COM-2(PC)F 63 Table 6.9. NS16550's Register (Short from National Semiconductor's data book) < 2 / 2 > Register 4 5 6 7 0 DLAB = 1 1 DLAB =1 Bit MODEM Line MODEM Scratch Divisor Divisor No. Control Status Status Register Latch Latch Register Register Register (LS) (MS) MCR LSR MSR SCR DLL DLM 0 Data Data Delta Bit 0 Bit 0 Bi ...

  • Compaq RS-232C - page 73

    Appendix COM-2(PC)F 64 D. Difference Between the COM- 2(PC)F and COM-2(PC)V The COM- 2(PC)F is an upgrade of the previous COM-2(PC)V board and is upwardly compatible. Therefore, the board can generally be used in the same way as the COM- 2(PC) V. However, as the bus specification has changed from the XT bus to the A T bus and the board sizes are di ...

  • Compaq RS-232C - page 74

    Index COM-2(PC)F 65 7. Index B Baud Rate, 57 Block Diagram, 34 Board Setup, 25 C Circuitry Diagrams, 34 Compatible Mode, 5 Connectors, 31 E Enhanced Mode, 5 External Connection, 31 F Features, 1 I I/O Address, 24 Internal Registers, 56 Interrupt Level, 26 L Liabilit y , 2 LSI Recovery Time, 58 M Mounting Method, 28 MS-DOS, 20 N NS16550's Regis ...

  • Compaq RS-232C - page 75

    Index COM- 2(PC)F 66 W W arrant y , 2 Windows 2000, 14 Windows 3.1, 19 Windows 95, 10 Windows Me/ 98, 6 Windows NT, 18 ...

  • Compaq RS-232C - page 76

    A-41-606 LZU2821 021025 [961015 ] ...

  • Compaq RS-232C - page 77

    A-46-368 Ver. 2001. 02. 06 CONTEC Group JAPAN : Headquarters CONTEC C o ., LTD. 3-9-31, Himesato, Nishiyodogawa-ku, Osaka 555-0025, Japan Tel : +81 (6) 6 477-5219 Fax : +81 (6) 6 477-1692 E-mail : intsales@osaka.contec.co. jp U.S.A. : CONTEC MICROELECTRONICS U.S.A. INC. 744 S outh Hillview Dr ive, Milpitas, CA 95035 U.S.A. Tel : +1 (408) 719-8200 F ...

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- Compaq product data sheets
- information booklets
- or energy labels Compaq RS-232C
All of them are important, but the most important information from the point of view of use of the device are in the user manual Compaq RS-232C.

A group of documents referred to as user manuals is also divided into more specific types, such as: Installation manuals Compaq RS-232C, service manual, brief instructions and user manuals Compaq RS-232C. Depending on your needs, you should look for the document you need. In our website you can view the most popular manual of the product Compaq RS-232C.

Similar manuals

A complete manual for the device Compaq RS-232C, how should it look like?
A manual, also referred to as a user manual, or simply "instructions" is a technical document designed to assist in the use Compaq RS-232C by users. Manuals are usually written by a technical writer, but in a language understandable to all users of Compaq RS-232C.

A complete Compaq manual, should contain several basic components. Some of them are less important, such as: cover / title page or copyright page. However, the remaining part should provide us with information that is important from the point of view of the user.

1. Preface and tips on how to use the manual Compaq RS-232C - At the beginning of each manual we should find clues about how to use the guidelines. It should include information about the location of the Contents of the Compaq RS-232C, FAQ or common problems, i.e. places that are most often searched by users in each manual
2. Contents - index of all tips concerning the Compaq RS-232C, that we can find in the current document
3. Tips how to use the basic functions of the device Compaq RS-232C - which should help us in our first steps of using Compaq RS-232C
4. Troubleshooting - systematic sequence of activities that will help us diagnose and subsequently solve the most important problems with Compaq RS-232C
5. FAQ - Frequently Asked Questions
6. Contact detailsInformation about where to look for contact to the manufacturer/service of Compaq RS-232C in a specific country, if it was not possible to solve the problem on our own.

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