Compaq COM-2(PC)F, RS-232C

Appendix

COM-2(PC)F46

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.

Set Baud Rate

Generator

Set Modem Control

Output

Read

Line Status Register

Read

Received Data Register

Set

Interrupt Enable Register

Set Transmission Format

(Line Control Register)

NoLine Status

D0 bit = 1

Yes

Read

Interrupt ID Register

Read

Modem Status Register

Display Receiver Buffer's

Data On CRT

START

Wait Time

(After Initialization)

Note:Wait Time =(sec)

Data Length

Baud Rate

Figure 6.4. Flowchart of Sample Program 2

Contents

Main Copyright Trademarks Product Configuration Table of Contents Page List of Figures Page List of Tables Page 1. Introduction About the COM-2(PC)F Board Support Software of Option Features Limited Three-Year Warranty How to Obtain Service Liability About the Manual Page 2. How to Use the Board Compatible Mode and Enhanced Mode Compatible Mode Enhanced Mode Operating under Windows Me/98 Page Page Page Operating under Windows 95 Page Page Page Operating under Windows 2000 Page Page Page Operating under Windows NT Operating under Windows 3.1 Operating under MS-DOS Page Page Page I/O Address Setting Hardware Setup COM-2(PC)F 25 Setting Procedure The I/O address is set using a DIP switch (SW1) on the board. Figure 3.2. I/O Address DIP Switch Table 3.1. I/O Address Settings Figure 3.2 shows the CN1 bace I/O address set to 2A0H and the CN2 bace I/O address set to 2A8H. Interrupt Level Setting Setting Procedure Page Mounting Method Page Page Hardware Setup COM-2(PC)F 31 Connecting the External Devices Figure 3.9. CN1 and CN2 Pin Assignments Figure 3.8. Interface Connectors (CN1 and CN2) Connecting the Cable System Reference COM-2(PC)F 33 4. System Reference 160.0 [mm] Specifications Table 4.1. Specifications Circuitry Diagrams Figure 4.2. COM-2(PC)F Block Diagram Figure 4.1. Circuitry Diagrams Block Diagram The following is a block diagram of the COM-2(PC)F interface board. 5. Troubleshooting QUESTIONS: Is the pilot light on? Did the system boot up? Does your program work? Does the sample program work? Is the input data accurate? Still have a probrem? Page Page 6. Appendix A. Sample Programs (for MS-DOS) COM-2(PC)F Diskette Sample Programs Page COM-2(PC)F42 Switch and Jumper Settings Table 6.2. Switch and Jumper Settings of Sample Program 1, 2, and 5 Table 6.3. Switch and Jumper Settings of Sample Program 3, 4, 6, and 10 COM-2(PC)F 43 Table 6.4. Switch and Jumper Settings of Sample Program 7 Table 6.5. Switch and Jumper Settings of Sample Program 11 COM-2(PC)F44 Cable Connection Figure 6.2. 9-pin Connector Diagram Page Page Page Page COM-2(PC)F 49 Figure 6.7. Flowchart of Sample Program 5 Page Page COM-2(PC)F52 Figure 6.10. Flowchart of Sample Program 8 COM-2(PC)F 53 Figure 6.11. Flowchart of Sample Program 9 Page Page B. Notes on Developing Driver Software Internal Registers Baud Rate Selection LSI Recovery Time Page Various Aspects of Interrupt Handling in Enhanced Mode and Compatible Mode Page COM-2(PC)F62 C. The Details on NS16550 Table 6.9. NS16550's Register (Short from National Semiconductor's data book) < 1 / 2 > COM-2(PC)F 63 Table 6.9. NS16550's Register (Short from National Semiconductor's data book) < 2 / 2 > D. Difference Between the COM-2(PC)F and COM-2(PC)V 7. Index Page Page CONTEC Group