Operating instructions

PTQ-MCM ♦ Quantum / Unity Platform Reference
Modbus Communication Module
Page 114 of 139 ProSoft Technology, Inc.
April 29, 2008
8.4.4 Port 2 Commands
Database Address Content
5870 Command #1
5877 Command #2
- -
6662 Command #100
Each of these commands uses eight registers (Enable, Internal Address, Poll
Interval, Reg Count, Swap Code, Node Address, Modbus Func, MB Address in
Device).
8.5 Port Specific Information
8.5.1 Serial Port Details
The ProTalk module contains three serial ports. The top port is the
Configuration/Debug port and is used for performing tasks such as uploading and
downloading configuration files, viewing module status, running diagnostics, and
troubleshooting. This port is a standard serial port set up for RS-232
communications.
8.5.2 RS-232 Configuration/Debug Port
This port is physically a DB-9 connection. This port permits a PC based terminal
emulation program to view configuration and status data in the module and to
control the module. The cable for communications on this port is shown below:
8.6 Modbus Protocol Specification
8.6.1 Read Output Status (Function Code 01)
Query
This function allows the user to obtain the ON/OFF status of logic coils used to
control discrete outputs from the addressed slave only. Broadcast mode is not
supported with this function code. In addition to the slave address and function
fields, the message requires that the information field contain the initial coil
address to be read (Starting Address) and the number of locations that will be
interrogated to obtain status data.