M-7084 User Manual, Rev. A1.3 7PH-013-A13
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1.10 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.
1.10.1 Protocol Switching
To switch to the DCON protocol:
1.
Set Modbus register 00257 to 0. See Section 3.1 for
details.
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 for the modules without frame ground, the
INIT* terminal should be connected to the GND terminal,
and for the modules with frame ground, the slide switch
on the rear side of the module should be set to the INIT
position, see the figure on the next page. See Section 2.23
for details.
2.
After a power-on reset, the communication protocol will
be changed to the Modbus RTU protocol.
