Johnson Controls FRICK QUANTUM HD - Rs-422 Connections

QUANTUM™ HD COMPRESSOR CONTROL PANEL
COMMUNICATIONS SETUP
090.040-CS (JAN 14)
Page 117
RS-422 CONNECTIONS
Refer to the following figure for the pin connections
showing how to attach a 4-wire RS-422 cable directly to
the Frick
®
Communications Converter Module:
-RX
-TX
+TX
+RX
RS-422 Connections
RS-485 CONNECTIONS
Although typical RS-485 communications requires a con-
trol signal to change the state of the RX/TX driver lines
to establish handshaking, this board incorporates a smart
feature that handles this handshaking internally, without
the user needing to provide it. It is a true two-wire sys-
tem. Refer to following figure for the pin connections
showing how to attach a 2-wire RS-485 cable directly to
the Frick
®
Communications Converter Module:
-RX/TX
+RX/TX
RS-485 Connections