Fairbanks FB2550 DAT SERIES DRIVER ACCESS TERMINAL - Manual (Page 82)

Section 4: Input/ Output
2/2013 82 51303 Rev. 1
5.4. SERIAL CARD
The SERIAL CARD ( 30921 ) provides four (4) outputs with a maximum of two
(2) cards
per Instrument. See the Port Assignments listed below.
– A bus cable is provided to connect the multi-function board to the expansion
card.
PORT 1 RS-232 (Full Duplex 9 Pin Port)
PORT 2 RS-232 OR 20 Ma *
PORT 3 RS-232 OR RS-422 *
PORT 4 RS-485
*
Only one (1) may be selected at a time, and not both.