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Serial Utilities and Programming
RS422.EXE
RS485.BAS
RS485.EXE
In addition the 3.5 inch disk contains the following files:-
@69E1.ADF
@69E0.ADF
ADDRCOM Program.
The ADDRCOM programs are used to set the serial port
address in the BIOS. The ADDRCOM3/4 programs are typically
used in the AUTOEXEC.BAT file to automatically set the BIOS
addresses for COM3 and COM4 ports every time the PC is
powered on.
The BIOS of most PC's automatically detects whether serial
ports at COM1 and COM2 addresses are present in a machine. The
problem comes with serial ports COM3 and COM4. PC's have a
table of information that stores the setup of the PC, this is the
BIOS data area. It has space for 4 serial port addresses. The trick is
to get the right addresses into the third and fourth port areas hence
the ADDRCOM3 and ADDRCOM4 programs.
If no parameters are given then the program prints out the
current serial and parallel port assignments. Thus:-
ADDRCOM3 <return>
COM1: =3F8
COM2: =2F8
COM3: <Not Set>
COM4: <Not Set>
LPT1: =3BC
LPT2: <Not Set>
LPT3: <Not Set>
Chapter 5 Page 56
Ready to run, compiled version of BASIC
program.
BASIC program useful in debugging
RS485 problems, not interrupt driven.
Demonstrates RS485 handshaking method.
Ready to run, compiled version of BASIC
program.
ADF file for PS DUAL RS232 card.
ADF file for PS DUAL RS422/485 card.
AT & OPTO DUAL RS422/485
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