Honeywell P520 Manual De Usuario

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.

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    

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

TRANSMIT/TO PROCESSOR
TRANSMIT/TO PROCESSOR

RECEIVE/FROM PROCESSOR
RECEIVE/FROM PROCESSOR

GROUND

SIGNAL PROCESSOR

TERMINAL

-RX

+RX

-TX

+TX

SIG GND