NEX7250 Zone 2 Annunciator
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27. Serial Communication Card
The series NEX7250 Alarm Annunciator can be fitted with a serial communications card, which will
provide an RS485 port to connect to external equipment. A number of features on this card are DIL-
switch selectable as described below.
Position Of DIL Switches On Communications Card
SW1-*
FUNCTION
ON
OFF
SW1-1
Address bit 1
1
0
SW1-2
Address bit 2
1
0
SW1-3
Address bit 3
1
0
SW1-4
Address bit 4
1
0
SW1-5
Address bit 5
1
0
SW1-6
Address bit 6
1
0
SW1-7
Enable remote serial pushbutton control
ON
OFF
SW1-8
Enable outputs for bulb drive
ON
OFF
SW2-*
FUNCTION
ON
OFF
SW2-1
Set communication baud rate
4800
9600
SW2-2
Set Modbus protocol type
RTU
ASCII
SW2-3
Set parity type
ODD
EVEN
SW2-4
Set as Modbus master or slave
Master
Slave
ON
1
2
3
4
5
6
7
O
N
1
2
3
4
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