C-2
Appendix C
Documentation Number 3PCIOSD2x-3903 Manual
B&B Electronics Mfg Co – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104
B&B Electronics Ltd – Westlink Comm. Pk. – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445
Port B Jumper Settings Mode Table
Port B (2)
Jumpers
RS-232
RS-422
4-Wire
RS-485
4-Wire
RS-485
2-Wire
JP2 Control
PORT 2
RTS(232)
not used
SD/RTS *
SD/RTS *
JP5 A
232
422/485
422/485
422/485
JP5 B
232
422/485
422/485
422/485
JP5 C
232
422/485
422/485
422/485
JP5 D
232
422/485
422/485
422/485
JP6 TX
not used
422
485
485
JP6 RX
not used
422
422
485
JP6
Termination
not used
IN/OUT
IN/OUT
IN/OUT
JP3 Shared
Clock
*4/*1
*4/*1
*4/*1
*4/*1
How to use the table:
The left vertical column shows the jumpers
for port B. The right 4 vertical columns show the position setting of
the jumper at the left for RS-232, RS-422 or 4-wire RS-485 or 2-wire
RS-485 modes.
NOTES:
RS-485 Mode: The JP2 Control jumpers should be set to Send
Data mode unless your software requires RTS control
Refer to the Setup section for explanations of the SD/RTS,
Termination and Clock settings.
Note that termination should only be used in systems with both high
baud rates (>19200) and over several thousand feet of cable.
Information on RS-422 and RS-485 communications can be found in
the B&B Electronics
RS-422/485 Application Note
(available free
on our Website)
.