Modbus Server - Comtrol DeviceMaster MOD Series Hardware Installation And Configuration Manual

Getting Started

Modbus Server

10 - Getting Started
The Modbus Server application was designed to provide enhanced connectivity for
OPC servers and applications that require Modbus/RTU communication from
Ethernet TCP/IP or COM ports directly to serial ports. While standard gateways
provide connectivity for only one application per serial port, Modbus Server
provides connectivity for up to six applications per serial port.
Modbus Server firmware supports Modbus/RTU masters over Ethernet TCP/IP (or
COM port with a serial port redirector).
Modbus Server firmware supports Modbus/RTU serial slaves.
Modbus Server firmware is recommended in installations that require only
Modbus/RTU connectivity directly to a serial port and do not require the more
advanced routing features found in Modbus Router.
Modbus Server highlights:
• Supports Modbus/RTU over Ethernet TCP/IP connections to the
corresponding serial port via intelligent Modbus message handling and
routing.
• Supports only Modbus/RTU over Ethernet TCP/IP connections to a serial port.
For Modbus/TCP functionality, please see the DeviceMaster UP.
• Supports up to six Ethernet TCP/IP connections to each serial port.
• Supports up to 255 Modbus devices per port. Both valid, (1-247), and reserved,
(248-255), device ids are supported
• Modbus/RTU specific message handling: ? CRC verification of all messages
received on the TCP/IP and serial interfaces
- Timing out of responses from slave Modbus/RTU devices
- Broadcast message handling on connected port only
• System monitoring to ensure gateway operation:
- Gateway busy
- Application message timeouts
• Advanced diagnostics web pages: ? Modbus device specific statistics, response
timing, and status. Up to 255 devices per serial port can be monitored
simultaneously.
- Serial port specific statistics and status
- Serial port message logging
• Combined with a serial port redirector, such as the Comtrol Secure Port
Redirector, can support up to six COM port connections to each serial port
DeviceMaster MOD | UP Hardware Installation and Configuration Guide: 2000630 Rev. B