Honeywell Stereo System P520 User Manual

11

66-2066—01

To change or check the station number of the P520, proceed 

as follows:

1. Press and hold the Reset button for 4 seconds.

2. The 4 LED digits will show the baud rate and the station 

number. The 2 leftmost digits are the baud rate (96 or 

48); the 2 rightmost digits are station number from (0 to 

63).

3. Press the up/down button to change the station number.

4. Press the Store button to save station number.

P520 with firmware version 5.0 still supports the existing 

Honeywell proprietary protocol. After power-up, the processor 

will listen for both protocols. Once the protocol has been 

detected, communication must remain in this protocol until the 

unit is powered off.

Four Modbus functions are supported:

• 01 Output Coil Read

• 03 Holding Register Read

• 06 Preset Single Holding Register

• 16 Preset Multiple Holding Register

Each Modicon PLC comes with a Modbus port. The control 

program can read/write the settings from/to the P520 signal 

processor via this port. A XMIT loadable module is needed to 

send Modicon functions. The XMIT loadable module is 

available from Modicon Inc.

A number of Modbus drivers for your operating system are 

available from third party developers. These drivers allows 

your application programs to communicate with the P520 

signal processors directly. 

It is necessary to use a converter at the host computer. The 

Honeywell COMMOD converter module can be used, and is 

recommended because of its photocoupler isolation. The 

converter must have galvanic ground isolation.

Each P520 must have its own unique address. The address 

can easily be changed by pressing the RESET push-button for 

>2 seconds. This causes the P520 to display its address on 

the four-digit display (0000 to 0063). The address can now be 

changed by using the UP or DOWN arrow buttons. When the 

desired address is displayed, push the STORE button, and the 

P520 will restore this new address.

In P520 signal processors with software revision 3.p and 

higher, the baud rate can also be changed when the module 

address is changed. The baud rate is displayed in the highest 

two digits of the numeric display (i.e., 4802 is 4800 baud and 

400001

Flame Count Of Active Channel (read 

only)

400002

Processor Status (read only) 

400002/0

Viewing head/Channel Selected 

(0=Channel A)

400002/1

Flame On Relay Status 

400002/2

Processor Lockout Status (0=lockout)

400002/3

Panel Access Disabled (0=disabled)

400002/44-20

Output Status (0=0-20)

400003

Flame On Channel A

400004

Flame On Channel B

400005

Flame Off Channel A

400006

Flame Off Channel B

400007

Gain Channel A

400008

Gain Channel B

400009IR

Analog Gain Channel A

400010IR

Digital Gain Channel A

400011IR

Filter Channel A

400012UV

Gain Channel A

400013IR

Analog Gain Channel B

400014IR

Digital Gain Channel B

400015IR

Filter Channel B

400016UV

Gain Channel B

400017

Viewing Head Type Channel A (read 

only)

400018

Viewing Head Type Channel B (read 

only)

400019

Temperature Channel A (read only)

400020

Temperature Channel B (read only)

400021

Time Delay on (Upper nibble = B lower 

=A)

400022FFRT

(Upper nibble = B lower = A)

400023

Firmware Version # (read only)

000001

Viewing head/Channel Selected 

(0=Channel A)

000002

Flame On Relay Status 

000003

Processor Lockout Status (0=lockout)

000004

Panel Access Disabled (0=disabled)

0000054-20

Output Status (0=0-40)