Operating the Analyzer
5.13 Modbus Communications
Overview
The UDA2182 provides Modbus communication support on two communication interfaces using the optional Communication Card. A general summary is listed below.
For details see UDA2182 Communications User Guide
Summary
Communications Card (Optional)
The Communications card provides one Serial Port (RS485) and one Ethernet Port.
Serial port provides
•RS422/RS485
•1200 to 38400 programmable baud rate
•Modbus RTU protocol to read signals including PV, Temperature, Alarm Status, outputs, relay status, etc.
•Read/write four analog and four digital variables (Note 1)
Ethernet port provides:
•Up to 5 Modbus TCP connections simultaneously
•Ethernet parameters are configured via the
•Web server with up to10 clients simultaneously
•
•
•DHCP: ( Dynamic Host Configuration Protocol) selectable via web page or
•Firmware upgrade to Main CPU board
•Firmware upgrade to Communications card
Note 1
There are four analog and four digital variables. These variables can be read and written remotely using Modbus function codes.
Variables will appear as a selection for various parameters:
•Analog variables can be an alarm source, analog relay source, current output source, monitor source, math source, auxiliary switch source, PID TRV, and PID remote setpoint.
•Digital variables can be an alarm disable, remote setpoint select, Tune Set2 select, digital relay source, logic- in source, auxiliary switch select, PID TRC select, PID RSP select, and auto cycle start source
Note 2
Web pages provide the following:
•Multiple language support
•“Guest” accessibility for
•“Admin” accessibility for read and write permission
•Readings of Inputs, Outputs, and Relay Outputs
•Status of Inputs, Outputs, and Alarms.
•Readings and Status of optional parameters (control, pharma, and
•List of last twelve events
•Network configuration including IP address, subnet mask, gateway etc.
•Email configuration for alarm event notification
50 | UDA2182 Universal Dual Analyzer Product Manual | January 2009 |
