Servomex SERVOTOUGH Oxy, Operator'S Manual

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01910001B_8 © Servomex Group Limited. 2020
35
Ini�ate Service in Progress
Status
(Latching Input)
+ve P804 Pin 5 +12V to 24V to start
-ve
P804 Pin 6
0V
Note:
For Initiate and Stop of Auto validation, Autocalibration and Calibrate Low and
Calibrate High, a momentary input of 0.5 seconds or longer is required, i.e.
momentary push button switch. To activate and deactivate Service in Progress, a
latching action switch is required.
Note:
Switch contacts should be suitable for low current switching.
5.3.5
Modbus RS485 and ethernet connections (option)
The Digital communica�ons terminals are separated from the analyser main circuit by
reinforced insula�on. The terminals must only be connected to circuits that are
themselves separated from mains voltages by at least reinforced insula�on.
The
analyser can be supplied with Modbus RS485/Ethernet digital communica�ons. For a full list of what
can be communicated over the Modbus communica�ons see
Appendix A.
If Modbus RS485 option is supplied:
1.
The cable should not leave the building in which it is installed without suitable isola�on.
2. The
screen should be terminated at the cable gland.
3.
Connect the wires in your cable to the screw terminals on the 5 pin interface connector
provided.
Refer to Sec�on 2.3 for the cable electrical requirements, and refer to Figure
14 the connec�on requirements.
Terminal pin Signal
P109 1 A
P109 2 B
P109 3 A
P109 4
B
P109 5
Termina�on
Figure
14 -
Modbus RS485 interface connector
Note:
Link pins 4 and 5 if the
analyser
is at the end of the RS485 network.