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I-7021/22/24, M-7022/24/28 User Manual, Rev: B2.3
41
1.12 M-7000 Notes
The main difference between the I-7000 and M-7000
series is that the M-7000 series has additional support for
the Modbus RTU communication protocol, which is the
default protocol of the M-7000 series. The
communication Baud Rates for the Modbus RTU protocol
can be in the range of 1200 bps to 115200 bps.
Modbus functions supported by the module are described
in Chapter 3.
1.12.1 Protocol Switching
To switch to the DCON protocol:
1.
Set Modbus register 00257 to 1.
2.
After a power-on reset, the communication protocol
will be changed to DCON.
To switch to the Modbus RTU protocol:
1.
Sends the $AAPN command and set N to a value of 1.
Note that the INIT* terminal should be connected to
the GND terminal, or the slide switch on the rear side
of the module should be set to the INIT position. See
Section 2.31 for details.
2.
After a power-on reset, the communication protocol
will be changed to the Modbus RTU protocol.
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