Honeywell IQ8Control C - Page 42

Fire Alarm Control Panel IQ8Control C/M
42 FB 798951.GB0 / 01.09
RS485 interface
An external device, such as an LCD display panel, can be connected to the A/B terminals via the RS485
interface.
A B
RS485
1
external device
BA
+
-
+UBext.
GND
X33
1
2
3
1
2
3
X35
A B
RS485
2
X34
X32
1
2
3
1
2
3

The RS485 BUS must be connected with an
EOL resistor at both
ends of the loop.
 If the FACP incl. basic module is the last
device on a loop end, the integrated EOL
resistor can be activated with the X32 jumper.
Fig. 36: RS485 interface
RS 485-1
A/B
Connection of the interface cable – total length max. 1000m
X32
closed Î RS 485 termination resistance activated
open
Î RS 485 termination not activated
RS 485-2
A/B
X33/35
X34
Do not alter position of the jumpers!
Do not connect terminals!