CAL Controls CALCOMMS 9300 User Manual

Installation/Cabling
Installation/Cabling
3
Termination resistors
–
120Ω
Tx
Rx
+
+
–
+
–
+
–
Tx
Rx
+
–
+
–
Tx
Rx
+
–
+
–
Tx
Rx
120Ω
Instrument 1 Instrument 2 Instrument ‘N’
Each RS485 interface has specific connection and
termination biasing requirements which will be detailed in
their installation instructions. The general principles are as
follows.
Terminations Because each wire is a transmission line, it
must be properly terminated to prevent reflections. Where
multiple instruments are daisy-chained together, a 120 ohm
terminating resistor should be fitted at the connection to
the PC and to the last instrument in the chain.

CAL Controls CALCOMMS 9300 Specifications

General

Brand	CAL Controls
Model	CALCOMMS 9300
Category	Temperature Controller
Language	English