Honeywell Q7055A - Manual (Page 20)

BUILDING NETWORK ADAPTER BNA-1C/2CS/2DN
20 EN1B-0198GE51 R0801
5.2 Field Bus Connection (Ch1 / Ch2)
Regardless of the type of BNA device, the wiring of
the field bus connector is always identical.
For connecting the field bus, the 3 pole Phoenix
connectors (included) are required.
A
C +
1 B
C -
2
GND
Figure 5-1
Figure 5-1 shows the pin layout of the field bus
connectors Ch1 and Ch2. Pins 1 and 2 shall be used
to connect the field bus.
5.3 Bus Termination Switch
This section applies to BNA 2CS and BNA 1C
devices only.
The Bus Termination Switch is used to select
between different field bus terminations on DC
coupled RS485 busses.