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P520 SIGNAL PROCESSOR
66-2066—01 12
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.
Fig. 6. Typical Communications wiring and recommended addressing.
Fig. 7. COMMOD communication converter wiring.
BNR 1
11
BOILER
1
ADDRESS
M33861
NOTES: A CONVERTER MAY BE NECESSARY FOR COMMUNICATION WITH THE MODBUS MASTER CONTROL.
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
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.
COMMOD USB TO RS422/485 CONVERTER
M33904
WIRE
SIDE
PRODUCT
SIDE
A TDA(–)
B TDB(+)
C RDA(–)
D RDB(+)
E GND
TDA(–)
TDB(+)
RDA(–)
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
TRANSMIT/TO PROCESSOR
TRANSMIT/TO PROCESSOR
RECEIVE/FROM PROCESSOR
RECEIVE/FROM PROCESSOR
GROUND
SIGNAL PROCESSOR
TERMINAL
-RX
+RX
-TX
+TX
SIG GND