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CHAPTER6 FUNCTIONS
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6.24 Serial Communication Function
6.24 Serial Communication Function Note28
(1) Definition
This function communicates in the MC protocol
*1
by connecting the RS-232 interface of the CPU module,
personal computer, and HMI by RS-232 cable.
This section describes the specifications, functions, and various settings of the function.
*1: The MC protocol is an abbreviation for the MELSEC communication protocol.
The MELSEC communication protocol is a communication method to access from an external device to the CPU module
according to the communication procedure for the Q series programmable controller (such as a serial communication
module, Ethernet module).
For the MC protocol, refer to the following.
MELSEC-Q/L MELSEC Communication Protocol Reference Manual
● A personal computer or HMI can communicate with a CPU module by the serial communication function only when the
CPU module is connected to it.
The CC-Link IE Controller Network, MELSECNET/H, Ethernet, or CC-Link cannot be communicated with another
station.
● The serial communication function is not used for connection of GX Developer or GX Configurator with the CPU
module.
Note28
Figure 6.92 Communication with personal computer or HMI
Note6.28
When using the Q00JCPU, High Performance model QCPU, Process CPU, or Redundant CPU, the serial
communication function cannot be used.
Basic
High
performance
Process
Redundant
Personal computer or HMI
RS-232 cable
Communication in the MC protocol
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