QuickServer Start-up Guide
Page 27 of 43
FieldServer Technologies 1991 Tarob Court Milpitas, California 95035 USA Web: www.fieldserver.com
Tel: (408) 262 2299 Fax: (408) 262 2269 Toll Free: (888) 509 1970 email: [email protected]
Appendix A.2.
RS-422 Connection R2 Port (Only available on the FS-QS-12XX models)
RS422 is a full duplex multi-drop multi-master differential bus. It can be wired to conform to a RS-485 network
when less wiring/cabling is used (due to being less expensive to install), but then it becomes a half-duplex multi-
drop multi-master differential bus. RS-422 is used for dedicated peer to peer high speed communication when low
bus latency is required i.e. very few devices on the bus. Its usage is very specific to client
installations/requirements.
Notes:
The RS-232 looks similar to the RS-485 but does not have the blue jumper. The blue jumper is used to
enable the termination resistor for the RX signals (120 ohms), while the red jumpers are used to enable
the bias resistors for RX signals (510 ohms). In the case of Rockwell/Tetrapak, all jumpers are always
required to be in default position i.e. not enabled. For other clients, the bias resistors should always be in
the on state.
The Part number on the back of the box will identify the port..
