1-2
1.5 Modbus RTU protocol
Items
Specifications
Transfer mode
RTU
Communication speed
9600,19200,38400 bit/sec
Parity
None/Even/Odd
Data length
8 bits
Stop bit
1 bit/2 bits
Slave address
1 to 247 ("0" must not be set)
Interface
RS-485
1.6 Modbus TCP protocol
The communication through Ethernet is available. The protocol is Modbus TCP.
1.7 Addition of new items and map version
Due to the version upgrade of the main unit, the content of the Modbus map may be changed.
If any change is applied to the Modbus map, the version of the Modbus map (address 30025) is also
updated in addition to the version of the main unit.
The setting items newly added can be used in the supported version or later. (See the table below.)
Refer item 2”READ AND WRITE OF DATA ” for map detail.
Recorder
version
Map
version Description
Remarks
Version 1.00
to 1.13
01
Initial release
The hold register is read only.
Non writable.
Version 1.20
to 1.21
02
Addition of writing processing to the hold
register
Hold register 40104 setting value saving
Hold register 40105 integration reset
function
Hold register 40111 SNTP update
function
Hold register 40112 to 40113
Support of parameter saving and loading
Hold register 46860 LCD warning
recovery
Version 1.30
to 1.42
03
Hold register 45561 to 45569 DI function
"U2" selection items have been added.
Hold register 45901 to 45906
Auto switch function of the displayed group
and the elapsed time count function have been
added.
Version 1.50
or later
04
Hold register 40284 input channel
Scale No.
41484 calculating channel
Scale No.
The older versions do not support the functions added in the new version. If the function attempts to perform writing or
reading operation against the newly added addresses, the operation may not work properly.
[Caution]