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Up to 10 users may be whitelisted.
The first column is a telephone number, with a length ranging from 1 to 16 bytes, and is mandatory.
The second column is the user name, with a length ranging from 0 to 16 bytes, and is optional.
After enabling the “Modbus to SMS” function, IG601 can identify two types of SMS commands sent
by the users on the white list. The IG601 performs an action corresponding to different commands and
then sends a response to the SMS user.
Users can send SMS to IG601 via mobile phone or SMS modem. Two types of SMS formats and
response message are as follows:
The SMS to inquire state
Users can send the following SMS command to inquire the IG601 operating status and the register
values of the PLC.
Request
Response Message
Description
GET
plc1 connected
plc2 disconnected
Inquire about the name
and status of all PLCs
connected to the IG601.
GET plc1_name,
plc2_name…
plc1 OUTPUT1=on
OUTPUT2=off
plc2 OUTPUT3=on
OUTPUT4=on
Inquire about the PLC
variables with names of
plc1_name, plc2_name.
The plcX_names are
parameter. Users can
query different PLC
variables by modifying
the plcX_name. Different
PLCs are separated by a
comma.
GET plc1_name
register1
register2
，
plc2_name
register3
register4,
…
Plc1 register1=5 register2=6
plc2 register3=1.8 register4=2.2
This command finds the
value of a variables under
a PLC named
plcX_name. The
plcX_name and registerX
are parameters. Users can
find the name of
corresponding variables
by trying different
