Campbell CSM1, Instruction Manual

Page: 47 / 74

B-1
Appendix B. COM Port Addresses
B.1 CSMCOM and COM3, COM4
While the addresses and interrupts associated with COM1 and COM2 are well
known and supported, some variation exist in the interrupts and addresses
associated with COM3 and COM4. The addresses and interrupts listed in the
table below for COM3 and COM4 are 'standard' in many cases. Listed in the
table are the addresses and interrupts (IRQ) supported by CSMCOM for all
four COM ports. Any serial port or PC201 card used with CSMCOM must be
set so the addresses and interrupts match the table. The appropriate switch and
jumper settings for the PC201 card are also given.
These settings allow CSMCOM to be used with most standard hardware
available for IBM PC/XT/AT computers (i.e. add-on serial cards, etc.). Most
boards use switches or jumpers to set the addresses and interrupts. Please
check the documentation for the board for details.
B.2 CSMCOM and the PC201 Card
The PC201 card's switches and jumpers allow it to be configured as any of the
COM ports given in the table. The settings for COM3 and COM4 differ from
those given in the PC201 manual. CSMCOM does not support the COM3 and
COM4 settings given in the PC201 manual.
B.3 PS/2 Computers and CSMCOM
COM1 or COM2 should be used with IBM PS/2 type computers. COM3 and
COM4 are not supported.
TABLE B-1. Use of COM3 and COM4 with CSMCOM
Addresses and interrupts
(IRQ) supported by CSMCOM PC201 CARD
Settings
Com Switch
Port IRQ Address 1234567 Jumper
COM1 4 03F8 1111111 3 & 4
COM2 3 02F8 1111101 1 & 2
COM3 4 03E8 1011111 3 & 4
COM4 3 02E8 1011101 1 & 2
1=CLOSED, 0=OPEN