User`s manual

PComm Programming Library...................................................................................4-1
Utilities...................................................................................................................4-2
DOS ......................................................................................................................4-6
Installing API-232...............................................................................................4-6
DOS API-232 Library ......................................................................................... 4-6
Utilities............................................................................................................... 4-6
RS-485 Programming ............................................................................................ 4-9
Automatic Data Direction Control Mode .............................................................4-9
By RTS Mode ....................................................................................................4-9
Connection Cable and Cable Wiring .................................................................. 5-1
RS-232 Cable Wiring............................................................................................. 5-1
RS-422 Cable Wiring............................................................................................. 5-4
RS-485 Cable Wiring............................................................................................. 5-6
Impedance Matching and Termination Resistors.................................................... 5-7
DB37 Connector .................................................................................................... 5-8
Troubleshooting ...................................................................................................... 6-1
General Troubleshooting........................................................................................ 6-1
Windows NT ..........................................................................................................6-2
Windows 95/98 ...................................................................................................... 6-3
Technical Reference ...........................................................................................A-1
Specification..........................................................................................................A-1
PCI ........................................................................................................................A-1
UART 16C550C.....................................................................................................A-2