4 Modbus Communications Procedure
4 - 12
E5@C Digital Temperature Controllers Communications Manual (H175)
Writing Undisplayed Parameters
It is possible to write the parameters that are not displayed due to display settings as well as the
parameters that are never displayed in the Controller.
• Example Command and Response
The following example shows the command/response when writing the Alarm Value Upper Limit 1
and Alarm Value Lower Limit 1 parameters.
(In this case, the slave address is H'01.)
Four-byte Mode
Alarm Value Upper Limit 1
• Address: H'010A; Write data: H'000003E8 (when 1000)
Alarm Value Lower Limit 1
• Address: H'010C; Write data: H'FFFFFC18 (when −1000)
Two-byte Mode
Alarm Value Upper Limit 1
• Address: H'2105; Write data: H'03E8 (when 1000)
Alarm Value Lower Limit 1
• Address: H'2106; Write data: H' FC18 (when −1000)
This function performs operations such as writing to the variable area (single) and operation commands
(communications writing, RUN/STOP, multi-SP, AT execute/cancel, write mode, save RAM data, soft-
ware reset, move to setup area 1, move to protect level, auto/manual switch, initialize settings, alarm
latch cancel, invert direct/reverse operation, program start, and SP mode.)
Writing is enabled in only the 2-byte mode.
Command Frame
Response Frame
(1) Write variable address
Specify the address of the setting data that is to be written. For details on addresses, refer
to Section 5 Modbus Communications Procedure.
For an operation command, specify 0000 or FFFF.
4-4-3 Variable Write, Single/Operation Command
01 10 01 0A
01 10 01 0A 00 04
00 04 E0 34(CRC-16)
08 00 00 03 E8 FF FF FC 18 8D E9(CRC-16)
Command:
Response:
01 10 21 05
01 10 21 05 00 02
00 02 5B F5(CRC-16)
04 03 E8 FC 18 66 BB(CRC-16)
Command:
Response:
CRC-16
12
2
1
H'06
Write data
2 bytes
Slave
address
Function
code
Write variable
address
CRC-16
12
2
1
H'06
Write data
2 bytes
Slave
address
Function
code
Write variable
address
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