RM-5000
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Basic Information
Basic information to use communication function RS-485(Modbus-RTU) of RM-5000
Setting
address
You can set Modbus address of RM-5000 to 1-128
The number of the simultaneous connection
Max. 127 sets against 1 x master unit
Transmission
Mode
RM-5000 supports RTU mode only although Modbus has ASCII mode (transmitted by ASCII strings)
and RTU mode (transmitted by binary transmission).
Available
function
The following Modbus function is available.
0x03
：
Read Holding Register
Exceptional
response
In the following cases, RM-5000 responds exceptional response of Modbus
1)
In a case that unavailable function is selected
(Available function on RM-5000 is 0x03)
Example:
Query :
010500000000****
←
Function code = 0x05
Response :
018500000000****
←
Exceptional response: Incorrect function
(0x80’s or is replied to receiving function)
2)
In a case that nonexistent data field is selected.
(Data field of RM-5000 is 40001
～
40032)
Example:
Query :
010300870001****
←
Data field = 40136
Response :
018300870001****
←
Exceptional response: Incorrect data field
(0x80’s or is replied to receiving function)
