APPENDIX B
PCCOM98 DEVICE DRIVER FOR MS/DOS

The PCCOM V2.0 software is a high performance, easy to use RS232/RS422 device driver for PC/XT, PC/AT, PC/386, PC/486, Pentium or compatibles. Under MS/DOS environment, you can set up your serial ports by PCCOM device driver, and these serial ports can be treated as COM1: and COM2: devices. The setup procedure provides flexible functions to specify the configuration of multi-serial card, that is, the hardware configurations of I/O port number, I/O port address, interrupt and interrupt vector are user selectable.

After the device driver is installed, It takes over communication between CPU and multi-serial cards such as four port card, eight port card, ... etc. For each I/O port, the service routine handles a ring buffer to keep track of all I/O data. Moreover, the PCCOM software provides library routines (C, PASCAL, BASIC, FoxPro) and DOS communication interface (DOS device driver, BIOS call) for several access levels.

The PCCOM V2.0 is an upgrade version of PCCOM V1.0 software, it combines with PCCOM V1.0 and SERIAL DRIVER utilities. Each serial port may be either 8250, 16450, 16550, or 16650 chip that was detected automatically.

Please write application program to control Rs485 by yourself, you can use function call to control driver and receiver of RS485.

STEP 1: Prepare PCCOM2.OPT file

The PCCOM2.OPT file contents are :

/B:2
/D:COM3
/A:[5:2A0,1,0,LO:(2k:9600:N-8-1:RTS+DTR:XON) ],
     [10:2A8,1,0,LO:(2k:9600:N-8-1:RTS+DTR:XON) ]

STEP 2: Prepare CONFIG.SYS file

Insert statement into CONFIG.SYS file

DEVICE = PCCOM.SYS @c:\pccom2.opt