Compaq COM-2-PC-F, RS-232C User Manual

COM-2(PC)F

RS-232C (2ch) Serial I/O Board

User’s Guide

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 subject to change without notice.

All relevant issues have been considered in the preparation of this document. Should you notice an omission or any questionable item in this document, please feel free to notify CONTEC Co., LTD.

Regardless of the foregoing statement, CONTEC assumes no responsibility for any errors that may appear in this document nor for results obtained by the user as a result of using this product.

Trademarks

MS, Microsoft, MS-DOS, Windows and Windows NT are trademarks of Microsoft Corporation. Other brand and product names are trademarks of their respective holder.

COM-2(PC)F i

Product Configuration

- COM-2(PC)F Board…1

- Sample Program Diskette (3.5inch/1.44MB)…1

- User's Guide (This Booklet)…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 items, contact your distributor or CONTEC group office where you purchased.

Note!

Do not remove the board from its protective packaging until the computer case is open and ready for installation. Electrical static can cause damage to electrical components.

COM-2(PC)Fii

Table of Contents

Trademarks ........................................................................i

Product Configuration ..................................................... ii

1. Introduction .............................................................1

About the COM-2(PC)F Board.....................................1

Support Software of Option..........................................1

Features.........................................................................1

Limited Three-Year Warranty......................................2

How to Obtain Service..................................................2

Liability.........................................................................2

About the Manual.........................................................3

2. How to Use the Board ............................................... 5

Compatible Mode and Enhanced Mode ...........................5

Compatible Mode..........................................................5

Enhanced Mode.............................................................5

Operating under Windows Me/98.....................................6

Procedure.......................................................................6

Operating under Windows 95.........................................10

Procedure.....................................................................10

Operating under Windows 2000.....................................14

Procedure.....................................................................14

Operating under Windows NT .......................................18

Procedure.....................................................................18

Operating under Windows 3.1........................................19

Procedure.....................................................................19

Operating under MS-DOS..............................................20

Procedure.....................................................................20

3. Hardware Setup ..................................................... 23

Names of Board Components.........................................23

I/O Address Setting.........................................................24

Setting Procedure .......................................................25

Interrupt Level Setting...................................................26

Setting Procedure .......................................................26

COM-2(PC)F iii

Mounting Method............................................................28

Connecting the External Devices...................................31

Connecting the Cable......................................................32

4. System Reference .................................................... 33

Specifications...................................................................33

Circuitry Diagrams.........................................................34

Block Diagram.................................................................34

5. Troubleshooting...................................................... 35

QUESTIONS:..................................................................35

Is the pilot light on?....................................................35

Did the system boot up? .............................................35

Does your program work?...........................................35

Does the sample program work? ................................36

Is the input data accurate?.........................................36

Still have a probrem?..................................................36

6. Appendix................................................................ 39

A. Sample Programs (for MS-DOS)................................39

COM-2(PC)F Diskette ................................................39

Sample Programs........................................................40

Switch and Jumper Settings......................................42

Cable Connection........................................................44

B. Notes on Developing Driver Software.......................56

Internal Registers.......................................................56

Baud Rate Selection....................................................57

LSI Recovery Time......................................................58

Various Aspects of Interrupt Handling in Enhanced

Mode and Compatible Mode.......................................60

C. The Details on NS16550 ............................................62

D. Difference Between the COM-2(PC)F

and COM-2(PC)V.......................................................64

7. Index ..................................................................... 65

COM-2(PC)Fiv

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. Rear Panel of IBM-PC/AT......................................... 28

Figure 3.5. Removing the Cover.................................................. 28

Figure 3.6. Expansion Slot Cover................................................ 29

Figure 3.7. Anchoring the COM-2(PC)F..................................... 30

Figure 3.8. Interface Connectors (CN1 and CN2)........................ 31

Figure 3.9. CN1 and CN2 Pin Assignments................................ 31

Figure 3.10. Example Connection to a Modem ............................. 32

Figure 3.11.Example Connection to a PC..................................... 32

Figure 3.12. Example Connection to a Device............................... 32

Figure 4.1. Circuitry Diagrams.................................................... 34

Figure 4.2. COM-2(PC)F Block Diagram.................................... 34

Figure 6.1. Floppy Disk Files...................................................... 40

Figure 6.2. 9-pin Connector Diagram.......................................... 44

Figure 6.3. Flowchart of Sample Program 1................................ 45

Figure 6.4. Flowchart of Sample Program 2................................ 46

Figure 6.5. Flowchart of Sample Program 3................................ 47

Figure 6.6. Flowchart of Sample Program 4................................ 48

Figure 6.7. Flowchart of Sample Program 5................................ 49

Figure 6.8. Flowchart of Sample Program 6................................ 50

Figure 6.9. Flowchart of Sample Program 7................................ 51

Figure 6.10. Flowchart of Sample Program 8................................ 52

COM-2(PC)F v

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 Jumpers (JP1~JP3)............................... 64

COM-2(PC)Fvi

List of Tables

Table 2.1. COM Port Support for Various Programming

Languages................................................................. 21

Table 3.1. I/O Address Settings................................................. 25

Table 3.2. Example Compatible Mode Settings......................... 27

Table 4.1. Specifications............................................................ 33

Table 6.1. Data Format.............................................................. 40

Table 6.2. Switch and Jumper Settings of Sample Program 1, 2,

and 5......................................................................... 42

Table 6.3. Switch and Jumper Settings of Sample Program 3, 4, 6,

and 10....................................................................... 42

Table 6.4. Switch and Jumper Settings of Sample Program 7 .... 43

Table 6.5. Switch and Jumper Settings of Sample Program 11... 43

Table 6.6. Function Selection through Internal Registers........... 56

Table 6.7. Baud Rate and Divisors............................................. 57

Table 6.8. Number of Times the IN Instruction Must be Executed

for the 2EFh Port after Accessing the LSI................. 58

Table 6.9. NS16550's Register (Short from National

Semiconductor's data book) < 1 / 2 > .................... 62

Table 6.9. NS16550's Register (Short from National

Semiconductor's data book) < 2 / 2 > .................... 63

Table 6.10. Specifications Differences....................................... 64

COM-2(PC)F vii

COM-2(PC)Fviii

1. Introduction

About the COM-2(PC)F Board

The COM-2(PC)F is an IBM PC/AT 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 Software of Option

- For Windows API-PAC(W32)

- For Windows 3.1 API-SIO(PC)WIN

- For MS-DOS SUPPORT-PAC(PC)103

Features

- 2-channel asynchronous communication

- Supports RS-232C protocol

- Programmable communication rate from 50 to 115,200 bits per second

- Two operational modes : Enhanced and Compatible (COM1, COM2, COM3, and COM4)

Introduction

For more information, see System Reference.

COM-2(PC)F 1

Introduction

Limited Three-Year 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 invoice and a Return Merchandise Authorization to the distributor or the CONTEC group office, from which it was purchased.

This warranty is not applicable for scratches or normal wear, but only for the electronic circuitry and original boards. The warranty is not applicable if the device has been tampered with or damaged through abuse, mistreatment, neglect, or unreasonable use, or if the original invoice is not included, in which case repairs will be considered beyond the warranty policy.

How to Obtain Service

For replacement or repair, return the device freight prepaid, with a copy of the original invoice. Please obtain a Return Merchandise Authorization Number (RMA) from the CONTEC group office where you purchased before returning any product.

*No product will be accepted by CONTEC group without the

RMA number.

Liability

The obligation of the warrantor is solely to repair or replace the product. In no event will the warrantor be liable for any incidental or consequential damages due to such defect or consequences that arise from inexperienced usage, misuse, or malfunction of this device.

COM-2(PC)F2

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

Introduction

COM-2(PC)F 3

Introduction

COM-2(PC)F4

How to Use the Board

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 features of each mode when selecting which mode to use in your system.

Compatible Mode

The two channels of the COM-2(PC)F can be used as standard PC serial ports. Channel CN1 of the COM-2(PC)F can be assigned as COM1 or COM3, and channel CN2 can be assigned as COM2 or COM4.

In Compatible mode, each channel uses one interrupt level. Therefore, your PC must have at least two interrupt levels available. The COM-2(PC)F uses the I/O addresses assigned to the standard serial ports.

As the COM-2(PC)F channels operate as standard serial ports, the board can be accessed using either the CONTEC driver software (purchased separately) or some other driver software that supports standard serial ports.

Enhanced Mode

The COM-2(PC)F operates under CONTEC's proprietary control procedures.

In Enhanced mode, a single interrupt level is used to control both channels. Therefore, the board can be used even if your PC has only one free interrupt level available. The I/O address used is specified by CONTEC.

As the board operates under CONTEC's proprietary control procedures, you must use the CONTEC driver software (purchased separately) or develop your own driver software. Programming for Enhanced mode is different to programming for Compatible mode.

COM-2(PC)F 5

How to Use the Board

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 called hardware installation. Use the following installation procedure.

Check the Current Settings

First, check the current settings. Check which interrupt levels are available. If using in Compatible mode, also check which COM ports (COM1 to COM4) are already set. The COM-2(PC)F cannot be assigned to a COM port that is already set. The procedure for checking is as follows.

- Check the interrupt level

1. Select [System] from [Control Panel] and open [Device

Manager].

2. Select the [Computer] folder and click [Properties].

3. Display the [Interrupt request(IRQ)] list and check which

interrupt levels are available.

- Check the ports

1. Select [System] from [Control Panel] and open [Device

Manager].

2. Double click on the [Ports (COM & LPT)], [Infrared], [Modem]

folder and check which ports are already set.

COM-2(PC)F6

How to Use the Board

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 on the

power to the PC.

3. After Windows Me/98 starts, select [Control Panel] from

[My Computer] and start the [Add New Hardware].

4. Click [Next >] in response to [To begin installing your new

hardware, click Next] in the Add New Hardware Wizard.

5. Select [Yes (Recommended)] in response to [Do you want

Windows to search for your new hardware ?].

6. After following the instructions and completing detection, use

[Details...] to check that the standard serial ports have been detected.

7. Next, click [Finish] and restart your computer.

(When Windows Me is used, it doesn’t need to restart.)

8. After rebooting, use the procedure described in the "Check

Resources" section below to check the interrupt level assigned to the COM-2(PC)F. If the value is different to the level set on the jumper, correct the setting in the OS.

9. When installing by this method, the COM-2(PC)F channels are

installed as standard serial ports (COM*).

COM-2(PC)F 7

How to Use the Board

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. Click [Next >] in response to [To begin installing your new

hardware, click Next] in the Add New Hardware Wizard.

4. Select [No] in response to [Do you want Windows to search for

your new hardware ?].

5. Select the [Ports (COM & LPT)] folder from the [Hardware

types:] screen.

6. Select [Communication Port] from [Models:] and click on [Have

Disk...] in the screen.

7. When the [Install From Disk] screen appears, place the floppy

disk in the drive, enter the drive name in [Copy manufacturer's file from:], then click [OK].

8. The next screen displays the board type. Select [CONTEC Co.,

Ltd. - COM-2(PC)F, V, H Compatible] from [Models:].

9. Next, the resource items and settings are displayed. Take a

note of the displayed I/O address and interrupt level.

10.End the operation as instructed. This completes the installation

of one port. When using both ports in Compatible mode, repeat the procedure from step 2. If the interrupt level used by a COM-2(PC)F port is already used on the PC, change the interrupt level to an available level.

11. Turn off the power, then set the operation mode (I/O address)

and interrupt level on the COM-2(PC)F to the values set in steps 9 and 10 above. Set the COM-2(PC)F switch and jumpers as described in Hardware Setup.

COM-2(PC)F8

How to Use the Board

Enhanced Mode Installation Procedure

When it is used with Enhanced Mode, API-PAC(W32) of the option is necessary. 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 and interrupt level) assigned to the COM-2(PC)F before actually using the board. Use the following procedure to check the resources managed by the OS.

1. Select [System] from [Control Panel] and click [Hardware]

property sheet, then open [Device Manager].

2. For Compatible mode, double click on the [Ports (COM &

LPT)] folder. For Enhanced mode, double click on the [Multi-function adapters] folder.

3. Double click on the [CONTEC Co., Ltd. - COM-2(PC)F] or

[COM*] folder to display the properties screen.

4. Select [Resources]. Check the resource items and settings, and

look for any conflicts.

5. Disable [Use automatic settings] first if changing the settings.

If changing an I/O address, change the Basic configuration from the [Setting based on:]. To change an interrupt level, click on [Change setting...]. After checking the resources, check again that the interrupt level value on the COM-2(PC)F board match the settings in the OS.

COM-2(PC)F 9

How to Use the Board

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 hardware installation. Use the following installation procedure.

Check the Current Settings

- Check the interrupt level

1. Select [System] from [Control Panel] and open [Device

Manager].

2. Select the [Computer] folder and click [Properties].

3. Display the [Interrupt request(IRQ)] list and check which

interrupt levels are available.

- Check the ports

1. Select [System] from [Control Panel] and open [Device

Manager].

2. Double click on the [Ports (COM & LPT)] folder and check

which ports are already set.

COM-2(PC)F10

How to Use the Board

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 on the

power to the PC.

3. After Windows 95 starts, select [Control Panel] from

[My Computer] and start the [Add New Hardware].

4. Click [Next >] in response to [To begin installing your new

hardware, click Next] in the Add New Hardware Wizard.

5. Select [Yes (Recommended)] in response to [Do you want

Windows to search for your new hardware ?].

6. After following the instructions and completing detection, use

[Details...] to check that the standard serial ports have been detected.

7. Next, click [Finish] and restart your computer.

8. After rebooting, use the procedure described in the "Check

Resources" section below to check the interrupt level assigned to the COM-2(PC)F. If the value is different to the level set on the jumper, correct the setting in the OS.

9. When installing by this method, the COM-2(PC)F channels are

installed as standard serial ports (COM*).

COM-2(PC)F 11

How to Use the Board

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 Next] in the Add New Hardware Wizard.

4. Select [No] in response to [Do you want Windows to search for

your new hardware ?].

5. Select the [Ports (COM & LPT)] folder from the [Hardware

types:] screen.

6. Select [Communication Port] from [Models:] and click on [Have

Disk...] in the screen.

7. When the [Install From Disk] screen appears, place the floppy

disk in the drive, enter the drive name in [Copy manufacturer's file from:], then click [OK].

8. The next screen displays the board type. Select [CONTEC Co.,

Ltd. - COM-2(PC)F, V, H Compatible] from [Models:].

9. Next, the resource items and settings are displayed. Take a

note of the displayed I/O address and interrupt level.

10.End the operation as instructed. This completes the installation

11. Turn off the power, then set the operation mode (I/O address)

and interrupt level on the COM-2(PC)F to the values set in steps 9 and 10 above. Set the COM-2(PC)F switch and jumpers as described in Hardware Setup.

COM-2(PC)F12

How to Use the Board

Enhanced Mode Installation Procedure

Check Resources

Always check the PC resources (I/O address and interrupt level) assigned to the COM-2(PC)F before actually using the board. Use the following procedure to check the resources managed by the OS.

1. Select [System] from [Control Panel] and open [Device

Manager].

2. For Compatible mode, double click on the [Ports (COM &

LPT)] folder. For Enhanced mode, double click on the [Multi-function adapters] folder.

3. Double click on the [CONTEC Co., Ltd. - COM-2(PC)F] or

[COM*] folder to display the properties screen.

4. Select [Resources]. Check the resource items and settings, and

look for any conflicts.

5. Disable [Use automatic settings] first if changing the settings.

COM-2(PC)F 13

How to Use the Board

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 called hardware installation. Use the following installation procedure.

Check the Current Settings

- Check the interrupt level

1. Select [System] from [Control Panel] and click [Hardware]

property sheet, then open [Device Manager].

2. Select the [View] and click [Resource by type].

3. Display the [Interrupt request(IRQ)] list and check which

interrupt levels are available.

- Check the ports

1. Select [System] from [Control Panel] and click [Hardware]

property sheet, then open [Device Manager].

2. Double click on the [Ports (COM & LPT)] [Infrared], [Modem]

folder and check which ports are already set.

COM-2(PC)F14

How to Use the Board

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 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 on the

power to the PC.

3. After Windows 2000 starts, select [Control Panel] from

[My Computer] and start the [Add/Remove Hardware].

4. Click [Next >] in response to [Welcome to the Add/Remove

Hardware Wizard] in the Add/Remove Hardware Wizard.

5. Select [Add/Troubleshoot a device] in response to [Choose a

Hardware Task].

6. The next, select [Add a New Device] and click [Next].

7. Select [Yes] in response to [Do you want Windows to search for

your new hardware ?], and click [Next].

8. It confirms that two [Install Communications Port] sentences are

indicated on the [Detected Hardware], and click [Next].

9. After rebooting, use the procedure described in the "Check

Resources" section below to check the interrupt level assigned to the COM-2(PC)F. If the value is different to the level set on the jumper, correct the setting in the OS.

10.When installing by this method, the COM-2(PC)F channels are

installed as standard serial ports (COM*).

COM-2(PC)F 15

How to Use the Board

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 start the [Add/Remove Hardware].

3. Click [Next >] in response to [Welcome to the Add/Remove

Hardware Wizard] in the Add/Remove Hardware Wizard.

4. Select [Add/Troubleshoot a device] in response to [Choose a

Hardware Task].

5. The next, select [Add a New Device] and click [Next].

6. Select [No] in response to [Do you want Windows to search for

your new hardware ?], and click [Next].

7. Select the [Ports (COM & LPT)] folder from the [Hardware

types:] screen.

8. Click [Hard Disk], and the [Install From Disk] screen appears,

place the floppy disk in the drive, enter the drive name in [Copy manufacturer's file from:], then click [OK].

9. The next screen displays the board type. Select [CONTEC Co.,

Ltd. - COM-2(PC)F, V, H Compatible] from [Models:].

10.Next, the resource items and settings are displayed. Take a

note of the displayed I/O address and interrupt level.

11. End the operation as instructed. This completes the installation

12.Turn off the power, then set the operation mode (I/O address)

and interrupt level on the COM-2(PC)F to the values set in steps 10 and 11 above. Set the COM-2(PC)F switch and jumpers as described in Hardware Setup.

COM-2(PC)F16

How to Use the Board

Enhanced Mode Installation Procedure

Check Resources

Always check the PC resources (I/O address and interrupt level) assigned to the COM-2(PC)F before actually using the board. Use the following procedure to check the resources managed by the OS.

1. Select [System] from [Control Panel] and click [Hardware]

property sheet, then open [Device Manager].

2. For Compatible mode, double click on the [Ports (COM &

LPT)] folder. For Enhanced mode, double click on the [Multi-function adapters] folder.

3. Double click on the [CONTEC Co., Ltd. - COM-2(PC)F] or

[COM*] folder to display the properties screen.

4. Select [Resources]. Check the resource items and settings, and

look for any conflicts.

5. Disable [Use automatic settings] first if changing the settings.

COM-2(PC)F 17

How to Use the Board

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 the board in compatible mode, the OS must be set to recognize the I/O address and interrupt level used by the COM-2(PC)F. Use the Ports icon in Control Panel to set the I/O address and interrupt level.

The I/O address and interrupt level used by the COM-2(PC)F do not need to be set for the OS when using the board in enhanced mode.

COM-2(PC)F18

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 using the board in Compatible mode, the OS must be set to recognize the I/O address and interrupt level used by the COM-2(PC)F. Use the Ports icon in Control Panel to set the I/O address and interrupt level.

The I/O address and interrupt level used by the COM-2(PC)F do not need to be set for the OS when using the board in Enhanced mode.

How to Use the Board

COM-2(PC)F 19

How to Use the Board

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 board in Compatible mode, the system area of the PC must be set to recognize the I/O address used by the COM-2(PC)F. If a system configuration program or the MODE.COM command is available on the PC, use the program to set the I/O addresses for the standard serial ports. If neither a system configuration program nor the MODE.COM command is available, use the SETCOM.EXE program provided on the floppy disk to set the I/O addresses for the standard serial ports as shown below. Set the I/O address to "NONE" for unused serial ports.

C>SETCOM [COM1 I/O address] [COM2 I/O address]

Example:

C>SETCOM 3F8 2F8 NONE NONE COM-2(PC) series compatible mode setting software by CONTEC

[COM3 I/O address] [COM4 I/O address]

I/O address data: COM1:[3F8] COM2:[2F8] COM3:[NONE] COM4:[NONE] C>

The I/O addresses used by the COM-2(PC)F do not need to be set for the system area of the PC when using the board in Enhanced mode.

COM-2(PC)F20

Note!

How to Use the Board

When used in Compatible mode, COM3 and COM4 are not supported by some programming languages. Check the specifications of the language you are using. Table 2.1. lists the COM ports supported by a number of common programming languages.

Table 2.1. COM Port Support for Various Programming

Languages

Language COM1 COM2 COM3 COM4

Microsoft C O O O O

Quick BASIC O O × ×

GW-BASIC O O × ×

Turbo Pascal O O O O

If writing your own driver software, see "Appendix B : Notes on Developing Driver Software".

COM-2(PC)F 21

How to Use the Board

COM-2(PC)F22

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.

Hardware Setup

Figure 3.1. Names of Board Components and Default

Factory Settings

COM-2(PC)F 23

Hardware Setup

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 each I/O device.

Most expansion boards are controlled via a range of consecutive I/O addresses. The address of the first I/O address in the range is called the base I/O address.

When using Enhanced mode, either 1A0H or 2A0H is selected as the base I/O address. In Compatible mode, the fixed address for the PC system is used.

Notes!

1. When using more than one expansion board, set each board so

that their I/O addresses do not overlap.

2. If the PC already has COM1 to COM4 ports, those ports cannot

be set for the board.

COM-2(PC)F24

Setting Procedure

The I/O address is set using a DIP switch (SW1) on the board.

123

SW1

MODE

Figure 3.2. I/O Address DIP Switch Table 3.1. I/O Address Settings

C N 1

OFF

123

SW1 Interrupt Vector

Bit 1 Bit 2 Register Address

ON Enhanced 1A0~1A7 1BF

OFF Enhanced 2A0~2A7 2BF

ON COM3 3E8~3EF ---

OFF

OFF COM1 3F8~3FF ---

I/O AddressFunction

Hardware Setup

SW1 Interrupt Vector

Bit 3 Bit 4 Register Address

ON Enhanced 1A8~1AF 1BF

C N 2

OFF Enhanced 2A8~2AF 2BF

ON COM4 2E8~2EF ---

OFF

OFF COM2 2F8~2FF ---

Function I/O Address

Figure 3.2 shows the CN1 bace I/O address set to 2A0H and the CN2 bace I/O address set to 2A8H.

COM-2(PC)F 25

Hardware Setup

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 connector on the NC pin of each jumper (JP1, JP2, and JP3).

When Using Interrupts

Connect the interrupt level using the short connector on each jumper (JP1, JP2, and JP3). Available interrupt levels are IRQ3 to 7, 9 to 12, 14, and 15.

JP1

Enhanced

3 4 567 10 11

121415NC

Note!

JP2

COM CN1

COM CN2

3 4 5 6 7 10 11 121415NC

JP3

3 4 567 10 111214

Figure 3.3. Interrupt Level Settings

If SW1 selects Enhanced mode, the settings in Figure 3.3. specify that CN1 and CN2 both use IRQ5. If Compatible mode is set, the settings specify that CN1 uses IRQ4 and CN2 uses IRQ3.

Jumper of the mode which isn’t used is to connect a short connector to the NC pin.

COM-2(PC)F26

Note!

Hardware Setup

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

If using the PC's RS-232C ports as COM 1 and COM 2 at the same time as using the CONTEC board as COM3 and COM4, COM3 and COM4 must be set to interrupt levels other than IRQ3 and IRQ4 because COM1 uses IRQ4 and COM2 uses IRQ3.

COM-2(PC)F 27

Hardware Setup

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 computer. When

removing screws, use a screwdriver that matches the screw heads.

Cover mounting screws

Cover mounting screw

Figure 3.4. Rear Panel of IBM-PC/AT

(2) Hold the left and right sides of the front cover and remove it

from the computer's chassis by sliding it to the front.

Figure 3.5. Removing the Cover

COM-2(PC)F28

Caution!

Hardware Setup

(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

To prevent a discharge of static electricity from damaging the board, it is important to ground yourself. Hold the packaged board in one hand and touch an unpainted, grounded metal surface with the other hand. Then, hold the non-conductive part of the board and remove it from the bag. Don't touch the underside side of the board with the exposed pins and solder. Place the board on a clean, non-conductive surface.

(4) Remove the board from the anti-static packaging. (5) Inspect the board. Check the board for any visible damage or

loose parts. If you notice any problems with the board, contact CONTEC. Don't attempt to fix the board yourself. CONTEC does not warranty boards damaged or worked-on by the customers.

(6) Insert the board into the expansion slot and press in firmly.

Make sure the board is fully seated in the support bracket.

COM-2(PC)F 29

Hardware Setup

(7) Anchor the board with the screw. Use the screw set aside in

Figure 3.7. Anchoring the COM-2(PC)F

(8) Replace the computer cover. (9) Connect the power cord.

step 3. Tighten so that the board is held in place.

COM-2(PC)F30

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.

Hardware Setup

CN1

1 5

CN2

On-board Connector : DELC-J9PAF-20L9 (Male) [mfd. by JAE] Application Connector : 17JE-13090-02 (D8C) (Female) [mfd. by DDK]

Figure 3.8. Interface Connectors (CN1 and CN2)

(Signal Ground) SG

(Data Terminal Ready) DTR

(Transmit Data) TXD

(Receive Data) RXD

(Data Carrier Detect) DCD

CN1/CN2

RI (Ring Indicator) CTS (Clear to Send) RTS (Request to Send) DSR (Data Set Ready)

Figure 3.9. CN1 and CN2 Pin Assignments

COM-2(PC)F 31

Hardware Setup

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. Accordingly, check the specifications of the external device to which you are connecting and select the appropriate type of cable. The two types of cable are "straightthrough" and "crossed". Also, if the signal lines require conditioning in the connector, provide conditioning in accordance with the specifications.

TXD RXD

RTS CTS DTR

DSR SG

Board

(Transmit Data)

TXD

(Receive Data)

RXD

RTS

(Request to Send) (Clear to Send)

CTS

(Data Terminal Ready)

DTR

(Data Set Ready)

DSR

(Signal Ground)

External Device

Figure 3.10. Example Connection to a Modem

TXD RXD RTS CTS DTR DSR SG

Board

TXD RXD RTS CTS DTR DSR

External Device

Figure 3.11. Example Connection to a PC

TXD RXD

RTS CTS

DTR DSR SG

Board

TXD RXD

RTS CTS

DTR DSR

External Device

Figure 3.12. Example Connection to a Device

COM-2(PC)F32

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

Data Length

Parity heck Even, Odd, Non-parity *1 Controller Chip NS16550 or equivalent Distance 15m Max.

Interrupt Requests

I/O Address 8 bits x 16 ports

Power Consumption +12VDC, 60mA Max.

Operating Temperature 0~50°C Storage Temperature -20~60°C Relative Humidity 20~90% non-condensing

Dimensions

Weight 130g

*1 : Software programmable.

For details, see "Appendix B Notes on Developing Driver Software" or refer to the data sheet of the NS16550 or the equivalent chip.

5, 6, 7, 8 bits 1, 1.5, 2 stop bits *1

Enhanced mode : 1 level Compatible mode : 2 levels

+5VDC, 420mA Max.

-12VDC, 50mA Max.

160.0 x 107.0 x 18.5mm (6.3inch x 4.2inch x 0.7inch)

System Reference

Board Dimensions

160.0

107.0

[mm]

COM-2(PC)F 33

System Reference

Circuitry Diagrams

SN75188

TXD, RTS, DTR

SN75189

15pF

Figure 4.1. Circuitry Diagrams

Block Diagram

The following is a block diagram of the COM-2(PC)F interface board.

Addr. Bus

(A9~A3)

AEN

Addr. Bus

(A2~A0)

IOR

IOW

RESET

Data Bus

(D7~D0)

IBM-PC/AT BUS

RXD, CTS, DSR

ADDRESS

DECODER

CNTROL BUFFER

DATA

BUFFER

INTERRUPT

VECTOR

CLOCK

NS16550

RS-232C

DRIVER &

RECEIVER

RS-232C

DRIVER &

RECEIVER

CN1 Serial Port

CN2 Serial Port

IRQ3~7, IRQ9~12, IRQ14, 15

INTERRUPT

JUMPER

Figure 4.2. COM-2(PC)F Block Diagram

COM-2(PC)F34

COM-2(PC)F

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 supply.

Did the system boot up?

If the board has been installed and the system did not boot, check the following:

- Make sure the board has been inserted firmly. Pull it out and try to reboot. If your system reboots, then re-insert the board and try to boot again.

- Check that cables attached to your other boards fit tightly.

Troubleshooting

Does your program work?

If the system booted and your program does not work, check the following:

- DIP switches have been set correctly for the desired base address.

- Selected base address doesn't conflict with another peripheral device or card installed in the computer.

- Selected interrupt levels don't conflict with interrupts required by other devices or cards.

- Try one of the sample programs provided on the disk and see if it works.

COM-2(PC)F 35

Troubleshooting

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 external connectors.

- Try using the COM-2(PC)F board with other non-essential boards removed. Remove other boards one by one, checking the COM-2(PC)F for successful operation after each board is removed.

Is the input data accurate?

If you believe something is wrong with either the input data or the output data, check the following:

- Environmental noise. Move the equipment and cables away from sources of electrical noise. Try an isolated power source.

- Dirty connector edge. Clean the edge.

- External connectors fit tightly. Separate and reattach external cables.

Still have a probrem?

Contact CONTEC group office where you purchased as shown in the last page of this manual.

Note!

Before you call, make a list of the following information. Our technical representatives will need the following information to help you.

1. Your name, company, and phone number.

2. The brand and type of computer you are using (e.g. IBM-AT,

Compaq 386).

COM-2(PC)F36

Troubleshooting

3. DOS Version.

4. Name of the CONTEC board that you are using.

5. Names 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 programming language that you are using

(and the version number).

COM-2(PC)F 37

Troubleshooting

10.Different I/O addresses you have tried.

11. Are you using your own program or a CONTEC sample

12.List AUTOEXEC.BAT.

13.List CONFIG.SYS.

program.

COM-2(PC)F38

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 to see a list of files on the COM-2(PC)F diskette.

A> dir

Backup Copy

Make a backup of the COM-2(PC)F diskette before use. This will protect you if the original copy becomes damaged or destroyed. Use the DOS DISKCOPY command.

A> diskcopy a: b:

Keep the original in a safe place and use the backup copy for the following procedures.

Appendix

Copy Files to Hard Disk

If a hard disk drive is available on your PC, then installing and executing the sample programs from the hard disk drive will be faster than using a floppy drive. To run sample programs from the hard drive, create a subdirectory named COM2F on your C drive and copy the files from A: to C: with the following commands.

A:> c: C:> md com2f C:> xcopy A:¥*.* c:¥com2f /s

COM-2(PC)F 39

Appendix

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 Data Format

Data bits 8 bits Stop bits 2 bits

Parity None

BAS

(1) H103HD01.BAS Data transmission (Enhanced mode) (2) H103HD02.BAS Data reception (Enhanced mode) (3) H103HD03.BAS Data transmission (COM1 mode) (4) H103HD04.BAS Data reception (COM1 mode) (5) H103HD05.BAS Data transmission and reception (Enhanced mode) (6) H103HD06.BAS Data transmission and reception (COM1, COM2 mode) (7) H103HD07.BAS Interrupt-driven data transmission and reception

H103HD.ASM

H103HD.BIN (8) H103HD08.BAS Half-duplex data transmission (Enhanced mode) (9) H103HD09.BAS Half-duplex data reception (Enhanced mode) (10)COM21_1.C Data transmission and reception (COM1, COM2 mode)

MSC

COM2V

COM21_1.EXE

(11)COM34_1.C Data transmission and reception (COM3, COM4 mode)

COM34_1.EXE SETCOM.EXE (Address setting file for Compatible mode)

Figure 6.1. Floppy Disk Files

COM-2(PC)F40

Notes!

Appendix

- 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 be used with the COM-2PD(PC) board.

COM-2(PC)F 41

Appendix

Switch and Jumper Settings

Table 6.2. Switch and Jumper Settings of Sample Program 1,

2, and 5

Item

I/O Address (SW1)

Interrupt Level (JP1, JP2, JP3)

JP1

JP2

JP3

Settings

SW1

123

OFF

9 3 4 5 6 7 10 1112 1415 NC

Table 6.3. Switch and Jumper Settings of Sample Program 3,

4, 6, and 10

Item

I/O Address (SW1)

Interrupt Level (JP1, JP2, JP3)

JP1

JP2

JP3

Settings

SW1

123

OFF

9 3 4 5 6 7 10 1112 1415 NC

COM-2(PC)F42

Appendix

Table 6.4. Switch and Jumper Settings of Sample Program 7

Item

I/O Address (SW1)

Interrupt Level (JP1, JP2, JP3)

JP1

JP2

JP3

Settings

SW1

123

OFF

9 3 4 5 6 7 10 1112 14 15 N C

Table 6.5. Switch and Jumper Settings of Sample Program 11

Item

I/O Address (SW1)

Interrupt Level (JP1, JP2, JP3)

JP1

JP2

JP3

Settings

SW1

123

OFF

9 3 4 5 6 7 10 1112 1415 NC

COM-2(PC)F 43

Appendix

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.

Signal

Pin No.

TXD

RXD

DTR

DSR

DCD

RTS

CTS

CH1 External device or CH2

Pin No. Signal

RXD TXD

3 6

DSR

DTR SG

RTS

7 8

CTS DCD

Figure 6.2. 9-pin Connector Diagram

COM-2(PC)F44

Appendix

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).

START

Set Baud Rate

Generator

Interrupt Enable Register

Set Transmission Format

Set

(Line Control Register)

Wait Time

(After Initialization)

Set Modem Control

Output

Read

Line Status Register

Read

Received Data Register

Note:

Modem Status Register

None Key

Wait Time =

Read

Interrupt ID Register

Read

A$=INKEY$

In Key

Line Status

D5 bit = 1

Yes

Data Transmission

Data Length

Baud Rate

Figure 6.3. Flowchart of Sample Program 1

(sec)

COM-2(PC)F 45

Appendix

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.

START

Set Baud Rate

Generator

Interrupt Enable Register

Set Transmission Format

Set

(Line Control Register)

Wait Time

(After Initialization)

Set Modem Control

Output

Read

Line Status Register

Read

Received Data Register

Note:

Modem Status Register

Display Receiver Buffer's

Wait Time =

Read

Interrupt ID Register

Read

Line Status

D0 bit = 1

Yes

Data On CRT

Data Length

Baud Rate

Figure 6.4. Flowchart of Sample Program 2

(sec)

COM-2(PC)F46

Appendix

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.

START

Set

Communication File

None Key

A$=INKEY$

In Key

Data Transmission

Figure 6.5. Flowchart of Sample Program 3

COM-2(PC)F 47

Appendix

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.

START

Set

Communication File

Yes

File Buffer = 0

Display File Buffer's

Data On CRT

Figure 6.6. Flowchart of Sample Program 4

COM-2(PC)F48

Appendix

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 CRT through CN2.

START

Channel 1

Set Baud Rate

Generator

Interrupt Enable Register

Set Transmission Format

Set

(Line Control Register)

Wait Time

(After Initialization)

Set Modem Control

Output

Read

Line Status Register

Read

Received Data Register

Read

Interrupt ID Register

Read

Modem Status Register

Channel 2

Interrupt Enable Register

Set Transmission Format

(Line Control Register)

Received Data Register

Modem Status Register

Set Baud Rate

Generator

Set

Wait Time

(After Initialization)

Set Modem Control

Output

Read

Line Status Register

Read

Interrupt ID Register

Read

Note:

Figure 6.7. Flowchart of Sample Program 5

None Key

Wait Time =

A$=INKEY$

Line Status

D5 bit = 1

Data Transmission

Line Status D0 bit = 1

Display File Buffer's Data

On CRT

Data Length

Baud Rate

In Key

Yes

(sec)

COM-2(PC)F 49

Appendix

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 program sends the keyboard input data from COM1 to COM2 and displays the data received from COM2 to CRT.

START

Set COM1

Set COM2

None Key

A$=INKEY$

In Key

Data Transmission

File Buffer = 0

Yes

Display File Buffer's Data

On CRT

Figure 6.8. Flowchart of Sample Program 6

COM-2(PC)F50

Appendix

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/transitdata routine is processed in the interrupt handler. The received data is stored in the data buffer. Data to be transmitted is read from the data buffer.

START

Machine Language Area

Set Segment

Load Interrupt

Handling Program

Set Baud Rate

Generator

Interrupt Enable Register

Set Transmission Format

Set

(Line Control Register)

Wait Time

(After Initialization)

Set Modem Control

Output

Read

Line Status Register

Read

Received Data Register

Read

Interrupt ID Register

Read

Modem Status Register

Interrupt Control Port

D7 bit ON

Note:

Data Transmission

Wait Time =

A$=INKEY$

In Key

Line Status

D5 bit = 1

Yes

Line Status

D0 bit = 1

Yes

Receive Data

Data Length

Baud Rate

None Key

(sec)

Figure 6.9. Flowchart of Sample Program 7

COM-2(PC)F 51

Appendix

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.

START

Set Baud Rate

Note:

Generator

Set Interrupt Enable

Set Transmission Format

(Line Control Register)

WAIT Time

(After Initialization)

Set Modem

Control Output

Read

Line Status Register

Read

Received Data Register

Read

Interrupt ID Register

Read

Modem Status register

Modem Control

RTS to LOW

Wait Time =

Data Length

Baud Rate

(sec)

Line Status

D6 bit = 1

Data Transmission

5 bytes Tramsmit

Transmit end

Modem Control

RTS to High

Line Status

D0 bit = 1

Display Receiver Buffer's

Data 0n CRT

5 bytes Receive

END

Figure 6.10. Flowchart of Sample Program 8

Yes

COM-2(PC)F52

Appendix

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.

Note:

START

Set Baud Rate

Generator

Set Interrupt Enable

Set Transmission Format

(Line Control Register)

WAIT Time

(After Initialization)

Set Modem

Control Output

Line Status Register

Received Data Register

Interrupt ID Register

Modem Status Register

Wait Time =

Read

Data Length

Baud Rate

(sec)

Line Status

D0 bit = 1

Display Receiver Buffer's

Yes

Data 0n CRT

5 bytes Receive

Yes

Modem Control

RTS to LOW

Line Status

D6 bit = 1

Yes

Data Transmittion

5 bytes Transmit

Yes

Transmit end

Yes

Modem Control

RTS to High

END

Figure 6.11. Flowchart of Sample Program 9

COM-2(PC)F 53

Appendix

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 CRT.

START

COM1

Initialization

COM2

Initialization

Transmit 1-byte

Data from COM1

COM2 status check

ready to receive?

COM2

Data Reception

Data reception A to K

from COM1 completed?

Yes

from COM2 completed?

Yes

COM1

Initialization

COM2

Initialization

Transmit 1-byte

Data from COM2

COM1 status check

ready to receive?

Yes

COM1

Data Reception

Data reception a to k

Yes

END

Figure 6.12. Flowchart of Sample Program10

COM-2(PC)F54

Appendix

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 CRT.

START

COM3

Initialization

COM4

Initialization

Transmit 1-byte

Data from COM3

COM4 status check

ready to receive?

COM4

Data Reception

Data reception A to K

from COM3 completed?

Yes

from COM4 completed?

Yes

COM3

Initialization

COM4

Initialization

Transmit 1-byte

Data from COM4

COM3 status check

ready to receive?

Yes

COM3

Data Reception

Data reception a to k

Yes

END

Figure 6.13. Flowchart of Sample Program 11

COM-2(PC)F 55

Appendix

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 how functions relate to the internal registers. To access the baud rate generator (defined on the next page), the DLAB signal must be set high. For more details on NS16550, refer to the National Semiconductor Data Book.

Table 6.6. Function Selection through Internal Registers

I/O Port Address DLAB *1 ACE Register (NS16550) Note *2 "Base Address" +0H 0 Receiver (Buffer register) R "Base Address" +0H 0 Transmitter (Holding register) W "Base Address" +1H 0 Interrupt Enable Register "Base Address" +2H x Interrupt ID R "Base Address" +2H x FIFO Control W "Base Address" +3H x Line Control "Base Address" +4H x Modem Control "Base Address" +5H x Line Status "Base Address" +6H x Modem Status "Base Address" +7H x Scratchpad Register "Base Address" +0H 1 Baud Rate Divider Register LSB "Base Address" +1H 1 Baud Rate Divider Register MSB

*1 DLAB: Divisor Latch Access Bit in the Modem Status Register. *2 R=Read only; W=Write only.

COM-2(PC)F56

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 (216 - 1). The output frequency of the baud rate generator equals 16 times the baud rate. Based on the originating clock frequency, the baud rate is derived as:

Divisor = clock frequency/(baud rate x 16)

Two eight-bit divisor registers on the ACEs store the divisor in a 16-bit binary format. These divisors must be loaded during initialization into Divider registers (see Table 6.6.). Table 6.7. provides frequently used baud rates and their divisors. The percent error is the difference between actual and desired value.

Table 6.7. Baud Rate and Divisors

Desired Baud Rate Divisor Percent Error

50 2304 --75 1536 ---

110 1047 0.026

134.5 857 0.058 150 768 --300 384 --600 192 ---

1200 96 --1800 64 --2000 58 0.680 2400 48 --3600 32 --4800 24 --7200 16 ---

9600 12 --19200 6 --38400 3 --57600 2 ---

115200 1 ---

Appendix

COM-2(PC)F 57

Appendix

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 earlier CPUs, software waits (JMP $+2) can be used to provide a recovery time when accessing the LSI. However, software waits cannot be used to provide a recovery time in PCs with a i486 or later CPU because of the CPU cache memory function.

The following describes one method of providing the recovery time when using an i486 or later CPU.

In the PC/AT and compatible computers, executing an IN instruction for the port at I/O address 2EFh (COM4 scratch register) takes a minimum of 0.5µs. As this time does not depend on the CPU type or clock rate, the time can be used to provide the recovery time. After accessing any of the devices listed in Table 6.8., execute the IN instruction for the 2EFh port the required number of times to provide the recovery time.

Table 6.8. Number of Times the IN Instruction Must be

Executed for the 2EFh Port after Accessing the LSI

LSI Device Output Input i8237 or equivalent None None i8254 or equivalent Once Once i8255 or equivalent Once Once i8259 or equivalent Once Once NS16550 or equivalent Once Once

PD7210C Once None

COM-2(PC)F58

Appendix

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 */

COM-2(PC)F 59

Appendix

Various 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 interrupt signal will be latched in the Interrupt Vector Register (IVR).

Therefore, when the CPU receives an interrupt requirement, the interrupt service routine can check the IVR to determine which channel is requesting interrupt service. After finishing the interrupt service process, the interrupt service routine has to check IVR again to see if a Pending interrupt request has occurred.

ACE (Asynchronous Communication Element) has its own internal register for enabling interrupts and identifying the interrupt service requesting channel. Refer to National Semiconductor's data book for additional details on NS16550 and its operation.

When turning on the PC's main power, the ACE's master reset function sets OUT1 to "High". This status automatically enables the interrupt. If one of the two channels is not allowed to generate the interrupt, set the OUT1 bit to "Low".

In addition to being able to enable/disable interrupt by channel, the board also has a global interrupt enable function. This global interrupt enable function determines whether the IRQ line is active or not. When turning on the power, this function sets to the disable status. To enable the PC bus to accept an interrupt, this function has to be programmed to enable status. To enable this function, write "1" to IVR's D7 bit; to disable this function, write "0" to IVR's D7 bit.

Figure 6.14. describes the bit function of IVR in Enhanced mode. The I/O address of IVR is either 2BF or 1BF.

COM-2(PC)F60

Appendix

Output Port

2BF/1BF

Input Port

2BF/1BF

D6 D5 D4 D3 D2 D1 D0

Not Used

D6 D5 D4 D3 D2 D1 D0

Not Used

Global Interrupt

0: Disable 1: Enable

CH1 Interrupt

0: Occurred 1: Not Occurred

CH2 Interrupt

0: Occurred 1: Not Occurred

Global Interrupt

0: Enable 1: Disable

Figure 6.14. IVR Bit Function in Enhanced Mode

Compatible Mode

When in the Compatible mode, CN1 of the interface board is compatible with COM1 or COM3 and CN2 is compatible with COM2 or COM4. By using JP2 and JP3, interrupt levels can be selected from IRQ3~IRQ7, IRQ9~IRQ12, IRQ14, and IRQ15 for CN1 and CN2. Normally, COM1/COM3 uses IRQ4 and COM2/COM4 uses IRQ3.

COM-2(PC)F 61

Appendix

C. The Details on NS16550

Table 6.9. NS16550's Register

(Short from National Semiconductor's data book)

< 1 / 2 >

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

(Read Only) (Write Only) (Read Only) (Write Only)

RBR THR IER IIR FCR LCR

0 Data Bit 0 Data Bit 0 Enable "0" if FIFO Word

Received Interrupt Enable Length

Data Pending Select Available Bit 0 Interrupt (WLS0)

(ERBFI)

1 Data Bit 1 Data Bit 1 Enable Interrupt RCVR Word

Transmitter ID FIFO Length

Holding Bit (0) Reset Select Register Bit 1

Empty (WLS1)

Interrupt

(ETBEI)

2 Data Bit 2 Data Bit 2 Enable Interrupt XMIT Number of

Receiver ID FIFO Stop Bits

Line Status Bit (1) Reset (STB)

Interrupt

(ELSI)

3 Data Bit 3 Data Bit 3 Enable Interrupt DMA Parity

MODEM ID Mode Enable

Status Bit (2) Select (PEN)

Interrupt

(EDSSI)

4 Data Bit 4 Data Bit 4 0 0 Reserved Even

5 Data Bit 5 Data Bit 5 0 0 Reserved Stick

Parity Select (EPS)

Parity

6 Data Bit 6 Data Bit 6 0 FIFOs RCVR Set

7 Data Bit 7 Data Bit 7 0 FIFOs RCVR Divisor

Enabled Trigger Break

(LSB)

Enabled Trigger Latch

(MSB) Access Bit

(DLAB)

COM-2(PC)F62

Table 6.9. NS16550's Register

(Short from National Semiconductor's data book)

< 2 / 2 >

4 5 6 7 0 DLAB = 1 1 DLAB =1 Bit MODEM Line MODEM Scratch Divisor Divisor No. Control Status Status Register Latch Latch

MCR LSR MSR SCR DLL DLM

0 Data Data Delta Bit 0 Bit 0 Bit 8

Terminal Ready Clear

Ready (DR) to Send (DTR) (DCTS)

1 Request Overrun Delta Bit 1 Bit 1 Bit 9

to Send Error Data

(RTS) (OE) Set Ready

(DDSR)

Appendix

2 Out 1 Parity Trailing Bit 2 Bit 2 Bit 10

3 Out 2 Framing Delta Bit 3 Bit 3 Bit 11

4 Loop Break Clear Bit 4 Bit 4 Bit 12

5 0 Transmitter Data Bit 5 Bit 5 Bit 13

6 0 Transmitter Ring Bit 6 Bit 6 Bit 14

7 0 Error in Data Bit 7 Bit 7 Bit 15

Error Edge Ring

(PE) Indicator

(TERI)

Error Data

(FE) Carrier

Detect

(DDCD)

Interrupt to Send

(BI) (CTS)

Holding Set

(THRE) (DSR)

Empty Indicator

(TEMT) (RI)

RCVR Carrier

FIFO Detect

(DCD)

COM-2(PC)F 63

Appendix

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 AT bus and the board sizes are different, the COM-2(PC)F may not fit in some PCs. Check the size of board that can be mounted in your PC before selecting the COM-2(PC)F. The two boards also differ in their specifications and hardware setup. The differences are described below.

Table 6.10. Specifications Differences

COM-2(PC)V COM-2(PC)F Bus XT Bus AT Bus Baud Rate 50~38,400bps 50~115,200bps Interrupt Level IRQ3~7, 9 IRQ3~7, 9~12, 14, 15

(Jumper Selectable) (Jumper Selectable)

Dimensions 120.0 x 107.0 x 18.5mm 160.0 x 107.0 x 18.5mm

Interrupt

setting

COM-2(PC)V

JP1~JP3

4 5 6

2 3 (Jumper Selectable)

COM-2(PC)F

JP1~JP3

(Jumper Selectable)

Figure 6.15. Difference in Jumpers (JP1~JP3)

COM-2(PC)F64

NC9 3 4 567 1011 121415

7. Index

Index

Baud Rate, 57 Block Diagram, 34 Board Setup, 25

Circuitry Diagrams, 34 Compatible Mode, 5 Connectors, 31

Enhanced Mode, 5 External Connection, 31

Features, 1

Mounting Method, 28 MS-DOS, 20

NS16550's Register, 62

Obtain Service, 2

Sample Programs, 39 Setup, 23 Specifications, 33 Support Software of Option, 1 System Reference, 33

I/O Address, 24 Internal Registers, 56 Interrupt Level, 26

Liability, 2 LSI Recovery Time, 58

Troubleshooting, 35

COM-2(PC)F 65

Index

Warranty, 2 Windows 2000, 14 Windows 3.1, 19 Windows 95, 10 Windows Me/98, 6 Windows NT, 18

COM-2(PC)F66

A-41-606

021025 [961015]

LZU2821

CONTEC Group

JAPAN : Headquarters

CONTEC Co., LTD. 3-9-31, Himesato, Nishiyodogawa-ku, Osaka 555-0025, Japan Tel : +81 (6) 6477-5219 Fax : +81 (6) 6477-1692 E-mail : intsales@osaka.contec.co.jp

U.S.A. : CONTEC MICROELECTRONICS U.S.A. INC.

744 South Hillview Drive, Milpitas, CA 95035 U.S.A. Tel : +1 (408) 719-8200 Fax : +1 (408) 719-6750 E-mail : tech_support@contecusa.com

EUROPE : CONTEC MICROELECTRONICS EUROPE B.V.

Binnenweg 4, 2132 CT, Hoofddorp, The Netherlands Tel : +31 (23) 567-3030 Fax : +31 (23) 567-3035 E-mail : tech_support@conteceu.nl

KOREA : HYOJIN CONTEC Co., LTD.

Ki-im Bldg. #399, Shindolim-Dong, Kuro-ku, Seoul, Korea Tel : +82 (2) 2636-4277/8 Fax : +82 (2) 2636-4279 E-mail : product@conteck.com

CHINA : INTERNATIONAL CONTEC TECHNOLOGY CO., LTD.

B-8F, Hua Tong Building, No. B19, Che Gong Zhuang West Road, Hai Dian District, Beijing 100044, China Tel : +86(10)8801-8228 Fax : +86 (10)8801-8209 E-mail : ict@ict.com.cn

SHANGHAI CONTEC MICROELECTRONICS CORP. No. 481 Gui Ping Road, Cao He Jing Hi-Tech Park Shanghai, 200233, China Tel : +86 (21) 6485-1907 Fax : +86 (21) 6485-0330 E-mail : contec@contec.com.cn

SHENYANG CONTEC MICROELECTRONICS Co., LTD. No. 169, Qingnian Street, Shenhe District, Shenyang 110015, China Tel : +86 (24) 2392-9771 Fax : +86 (24) 2392-9773

TAIWAN : MACROMATE CORP.

8F, Universal Center, No.179, Ta-Tung Rd., Sec.1 Hsi-Chih, Taipei Hsien, Taiwan, R.O.C Tel : +886 (2) 2647-9353 Fax : +886 (2) 2647-9373 E-mail : intl@macromate.com.tw

A-46-368 Ver. 2001. 02. 06

Compaq COM-2-PC-F, RS-232C User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual