VALVE GP-PITCH RELIEF 8J3630 - Caterpillar

Overview
The Network Management Card With Modbus Monitoring supports the Modbus interface when connecting to a Building Management System.This document details the methods for configuring the Modbus settings for the NMC.Configuring Modbus in the Web Interface
Path: Administration > Network > Modbus > serial (or TCP)
Enable or disable access to the Modbus serial or TCP interface by selecting or clearing the "Enable" check box.Select a port number for the TCP Modbus connection in the "Port" field.Select the baud rate for the serial Modbus connection by choosing either "9600" or "19200" baud.Select a parity for the serial Modbus connection by choosing "Even", "Odd", or "None".Note: If you select "None", the Modbus master should be set to use two stop bits. For "Even" or "Odd", use one stop bit.Set the unique ID for the device by providing a value in the "Target Unique ID" field. The value must be between 1 and 247 (inclusive).When you are finished making your selections, click "Apply" to save your changes.Configuring Modbus on the Command Line
Modbus
Access - Administrator onlyDescription - Manually configure these Modbus settings for the Management Card:
Table 1
Option    Argument    Description    
-p         Display the configured Modbus parameters.    
-a     enable l disable     Enable or disable the Modbus feature.    
-br     9600 l 19200     Set the baud rate.    
-pr     even l odd l none     Set the parity bit.    
-s     <slave # in hex>     Set the Modbus slave address.    
-o     master l slave     Define the mode of operation for the Modbus feature.    
-rt     <timeout in mSec>     Set the response timeout in milliseconds for query packets in Master mode.    
-sr     <scan rate in mSec>     Set the scan rate for query packets in Master mode.    
-rep     <# of repetitions>     Set the number of repetitions for query packets in Master mode.    
-resetToDef         Reset the Modbus settings to the default values.    Modbus Wiring Diagrams
2-wire configuration
Illustration 1 g02583456
4-wire configuration
Illustration 2 g02583460