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P520 SIGNAL PROCESSOR
address 2). To change to 9600 baud, increase the display past
4863. The next display will be 9600, which is 9600 baud,
address 0. Then increase the display further to the desired
address. To return to 4800 baud, reduce the display below
9600, and set the desired address.
ADDRESS
ADDRESS
NOTES: A CONVERTER MAY BE NECESSARY FOR COMMUNICATION WITH THE MODBUS MASTER CONTROL.
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.
66-2066—01
1
BOILER
BNR 1
BNR 2
11
12
BNR 1
BNR 2
31
32
BOILER 3
MODBUS
MASTER CONTROL
USE SHIELDED CABLE FOR COMMUNICATION WIRING.
DRAWING IS FOR GENERAL REFERENCE ONLY.
FOR RS422 COMMUNICATION WITH THE P520, 4 WIRES FROM EACH SIGNAL PROCESSOR WILL BE
REQUIRED (+RX, -RX, +TX, -TX), FOLLOWING POLARITY FROM EACH SIGNAL PROCESSOR. AT THE
CONVERTER, THE TRANSMIT AND RECEIVE WIRES WILL BE REVERSED. REFER TO FIG. 7 FOR
CONVERTER TO SIGNAL PROCESSOR WIRING DETAILS.
Fig. 6. Typical Communications wiring and recommended addressing.
WIRE
PRODUCT
SIDE
SIDE
A
TDA(–)
B
TDB(+)
CONVERTER
CONNECTOR
C
RDA(–)
TDA(-)
D
RDB(+)
TDB(+)
E
GND
RDA(-)
RDB(+)
GND
Fig. 7. COMMOD communication converter wiring.
BNR 3
BNR 4
BNR 5
13
14
BNR 3
BNR 4
33
34
COMMOD USB TO RS422/485 CONVERTER
SIGNAL PROCESSOR
DESCRIPTION
TERMINAL
TRANSMIT/TO PROCESSOR
-RX
TRANSMIT/TO PROCESSOR
+RX
RECEIVE/FROM PROCESSOR
-TX
RECEIVE/FROM PROCESSOR
+TX
GROUND
SIG GND
12
BNR 6
15
16
M33861
M33904
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