Honeywell Q7055A user manual L1 Bus Termination, XD508 compatible bus termination enabled

BUILDING NETWORK ADAPTER BNA-1C/2CS/2DN

XD508 compatible; bus termination enabled

XD508 compatible switch position for C-Busses equipped only with XL500 family controllers with bus termination enabled. This switch position must be used if the BNA device is installed at the end of such a C-Bus.

5.4L1 Bus Termination

This section applies to BNA 2DN devices only.

The required L1 bus EOLRs (End of Line Resistors) can be connected externally onto each CH1 / CH2 connector.

When the L1 bus uses 18 gage, twisted pair, non- shielded wire, the ends of the line should be terminated with a 62 Ω ±10% 0,5 W carbon resistor between each wire and ground.

When the L1 bus uses 24 gage, dedicated solid copper pair, standard balanced telephone cable, the ends of the line should be terminated with a 100 Ω ±5% 0,5 W carbon resistor between each wire and ground.

For further information regarding L1 bus termination, please refer to Honeywell DeltaNet R7044 EXCEL PLUS CONTROLLER Application Guide 74-2548, Rev.2/93.

22 EN1B-0198GE51 R0801