U2 COMBINATION VIEWING HEAD AND SIGNAL PROCESSORS
11
66-2071—02
Fig. 3. Typical Communication Wiring and Recommended Addressing.
Fig. 4. Wiring of RS422/485 to USB Converter to U2.
BNR 1
11
BOILER
1
ADDRESS
M33521
FOR PF VERSION CAB 19: + = WHITE
– = BROWN
FOR QD VERSION CAB 22: + = WHITE
– = YELLOW
NOTES:
– A CONVERTER MAY BE NECESSARY FOR COMMUNICATION WITH THE MODBUS MASTER CONTROL.
– USE SHIELDED CABLE FOR COMMUNICATION WIRING.
MODBUS
MASTER CONTROL
BNR 1
31
BNR 2
12
BNR 2
32
BNR 3
13
BNR 3
33
BNR 4
14
BNR 4
34
BNR 5
15
BNR 6
16
ADDRESS
BOILER 3
COMMOD USB TO RS422/485 CONVERTER
M33862
WIRE
SIDE
PRODUCT
SIDE
A TDA(–)
B TDB(+)
C RDA(–)
D RDB(+)
E GND
TD
A(–)
TDB(+)
RD
A(–)
RDB(+)
GND
NOTES:
SELECT THE APPROPRIATE DIP SWITCH SETTINGS FOR RS-485 COMMUNICATION PER THE VENDOR’S INSTRUCTION SHEET.
SOFTWARE DRIVERS MAY BE DOWNLOADED FROM B&B ELECTRONICS’ WEBSITE.
CONVERTER
CONNECTOR
TDA (-)
TDB (+)
RDA (-)
RDB (+)
GND
DESCRIPTION
DATA A (-) INPUT/OUTPUT
DATA B (+) INPUT/OUTPUT
DATA A (-) INPUT/OUTPUT
DATA B (+) INPUT/OUTPUT
GROUND
U2 CONNECTOR
(CAB22)
YELLOW
WHITE
SHIELD
U2 PIPE FITTING
(CAB19)
BROWN
WHITE
DRAIN WIRE
