O & M Manual – Insulated Case ATS Rev: October 2020
Publication Number:
MN0100700E
Version: V10.01.20
Page 29
Figure 22 - RS232 Pinouts – View looking into the
Male Connector
Figure 23 – RS485 & RS232 Communication
Terminals
Table 7 – RS485 Terminals
Pin No.
Notes
Description
1
A
Data (A) -
2
B
Data (B) +
3
SCR
Twisted Pair Communication Wire Shield
Table 8 - Communications
Symptom
Possible Remedy
RS485 inoperative
Check :
•
Connection cable – Belden 9841 or equivalent
•
120
Ω
termination resistors are correctly fitted
•
Baud rate of controller and of master device are the same
•
Slave ID of the controller is the same as configured in the
master device
RS232 connection to PC
inoperative
Check :
•
RS232 maximum of 15 m is not exceeded
•
Direct to PC connection requires a Crossover (NULL modem)
RS232 cable
•
Baud rate of controller and of master device are the same
•
Slave ID of the controller is the same as configured in the
master device
RS232 connection to GSM
modem inoperative
Check :
•
RS232 maximum of 15 m is not exceeded
•
Modem Initialization strings in the DSE configuration is correct
for the connected modem type
•
Modem is configured to 9600 baud
•
SIM card is CSD (circuit switched data) compatible
•
SIM card is not PIN locked
•
SIM card is correctly inserted
•
Antenna is correctly installed and is not inside an earthed
metal cabinet / control panel
•
A good signal is available in the locality
RS232 connection to
landline modem inoperative
Check :
•
RS232 maximum of 15 m is not exceeded
•
Modem Initialization strings in the DSE configuration is correct
for the connected modem type
•
Modem is configured to 9600 baud
