QuickServer Start-Up Guide
Page 33 of 71
APPENDIX A
USEFUL FEATURES
Appendix A.1. RS-422 Connection R2 Port
NOTE: The following only applies to models: FS-QS-1230 and FS-QS-1231.
RS-422 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 (very few devices on the bus). Its usage is very specific
to client installations/requirements.
NOTE:
•
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 (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.
Figure 29: RS-422 Unit
