36
TTL-Compatible
Voltage Level
Figure 12.6 (b)
14
15
Potential-free
Contact closure
Figure 12.6 (a)
14
15
SERIAL COMMUNICATION PORT
(Terminals : 14 , 15)
Figure 12.5
(The Option plug-in module is supplied as either RS485 Serial Port or Digital Input for Auxiliary SP Selection).
If the Optional plug-in communication board is fitted, connect terminal 15 and 14 of the controller to (+) and (-) terminals of the
Master device.
For reliable noise free communication, use a pair of twisted wires inside screened cable as shown in Figure 12.5. The wire
should have less than 100 ohms / km nominal DC resistance (Typically 24 AWG or thicker). Connect the terminating resistor
(Typically 100 to 150 ohm) at one end to improve noise immunity.
DIGITAL INPUT FOR AUXILIARY SP SELECTION
(Terminals : 14, 15)
(The Option plug-in module is supplied as either RS485 Serial Port or Digital Input for Auxiliary SP Selection).
The plug-in Option module for selecting Auxiliary SP is factory configured for either potential-free contact closure or TTL-
compatible voltage input.
The Setpoint selection is as under :
a) Potential-Free Contacts :
OPEN
:- Main SP selected
CLOSE
:- Auxiliary SP selected
b) TTL-compatible Voltage :
> 0.6 V
:- Main SP selected
< 0.5 V
:- Auxiliary SP selected
Terminating Resistor
Screened Cable
Twisted
Wire Pair
(100 to 150 Ohms)
15 (B-)
HOST
B-
B+
Master Device
Serial Comm.
Terminals
14 (B+)
User Manual
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