PROTOCOL-SPECIFIC INFORMATION
9.7 MELSEC Client
9.7.1 Overview
The Mitsubishi MELSEC communication protocol (MC protocol) is an application-level protocol
implemented on top of the Ethernet TCP/IP and UDP/IP layers that is typically used to read and write
data from/to devices supporting compatible 4E (MT), 3E (ST) and 1E frame types. As a client device, the
interface card will initiate a read/write request to a server device. The server device will then respond
with the appropriate data.
For more information regarding the MELSEC protocol, refer to the Mitsubishi MELSEC Communication
Protocol reference manual.
Other notes of interest include:
• Supports both TCP and UDP transport layers.
• Target up to 8 remote server devices.
• Supports option to auto-detect the frame type. The frame type is prioritized in the following order:
3E, 4E, and 1E. Otherwise the frame type can be manually selected (refer to the server equipment
user’s manual).
• User-specified device codes allow the ability to target any device type, even if the device is not
explicitly supported by the driver.
• The driver can be configured to perform a timeout action.
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