Loopback Test; Loopback Test (Command: 0619) - Mitsubishi Electric MELSEC IQ-R series Reference Manual

11.4

Loopback Test

This chapter explains the commands for testing the connection and data communication between an external device and
connected station.
The command can only be used for C24 (including multidrop connection station) and E71 connected to the
external device. It cannot be used via network.

Loopback test (command: 0619)

Perform the test to check whether the communication between the external device and connected station is normal. By
performing the loopback test, the connection with external devices and operation of data communication can be checked.
Message format
The following shows the message format of the request data and response data of the command.
■Request data
Command Subcommand
■Response data
The same data as "Number of loopback data" and "Loopback data" specified for request message is stored. (Page 171
Loopback data)
Number of Loopback
loopback data data
Data specified by request data
■Command
ASCII code
0 6 1 9
30 36 31 39
H H H H
■Subcommand
ASCII code
0 0 0 0
30 30 30 30
H H H H
■Number of loopback data, loopback data
Specify the data to be transmitted by loopback test. (Page 171 Loopback data)
The data can be specified within the range (numerals 0 to 9 and characters A to F) of 1 to 960 bytes.
Number of
Loopback data
loopback data
Binary code
19 06
H H
Binary code
00 00
H H
11 CONTROL MODULE OPERATION
11.4 Loopback Test
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