Campbell Scientific PC208 Datalogger Support Software - Manual (Page 113)

B-1
APPENDIX B. USE OF COM3 OR COM4
B.1 PC208 AND COM3 AND 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 have
evolved as somewhat 'standard'. Listed in the
table are the addresses and interrupts (IRQ)
supported by PC208 for all four COM ports.
Any serial port, internal modem, or PC201 card
used with the PC208 software 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 PC208 to be used with
most standard hardware available for IBM
PC/XT/AT computers (i.e. internal modems,
add on serial cards, etc.). Most boards use
switches or jumpers to set the addresses and
interrupts. Check the documentation for the
board.
B.2 PC208 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
prior to May 1992.
B.3 PS/2 COMPUTERS AND PC208
COM1 and COM2 should be used with IBM
PS/2 type computers. COM3 and COM4 are
not supported.
TABLE B-1. COM PORT Addresses and PC201 Card Settings.
Addresses and Interrupts PC201 CARD
(IRQ) Supported by PC208 Settings
Com IRQ Address Switch Jumper
Port 1234567
---------------------------------------------- ----------------------------------------------
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
*PC208E, TELCOM, and GT also support the use of IRQ 5 with COM3 and COM4.