20
Data address
Caution
The data address is described in the following two ways.
Absolute address: The address where the data is stored.
Communication address: Start address for communication in Modbus RTU
When communicating with Modbus RTU, the start address must be one less than the
address of the data to be read/written.
(For details of communication contents, refer to “9-5 Communication format”.)
Some communication software automatically sends one less than the address when
communicating when an absolute address is specified.
■
Coil address map
Data address (Coil)
R/W
Item
Description
Absolute
address
Communication address
(decimal)
00
2001
0x07D0 (2000)
R/W
⋆
1
“EXC” command output
Use for calibration (sensitivity
adjustment)
2002
0x07D1 (2001)
“CAL” command output
2003
0x07D2 (2002)
“PRT” command output
2004
0x07D3 (2003)
“R” command output
Performs zero reset (re-zero) of weighing
value
2005
0x07D4 (2004)
“SMP” command output
Changes the minimum display of the
weighing device
2006
0x07D5 (2005)
“U” command output
⋆
2
Changes response characteristics or
switching units
2007
0x07D6 (2006)
“RZ” command output
Performs zero reset (re-zero) of weighing
value
2008
0x07D7 (2007)
“Z” command output
⋆１．
When “1” is written, the AD-8551R outputs each command to the connected weighing device and returns
the Coil status to “0”. “0” is output when performing reading.
⋆２．
The operation differs depending on the weighing device. Refer to “3-2 Applicable models” or the operation
manual of the individual weighing device for the operation with that weighing device.
■
Holding Register address map
Data address
（
Holding Register
）
R/W
Item
Description
Absolute
address
Communication address
(Decimal number)
40
2001
0x07D0 (2000)
R
⋆３
Weighing value (Lower)
32 bit binary representation
2002
0x07D1 (2001)
Weighing value (Upper)
2003
0x07D2 (2002)
Status information (Lower)
⋆４
2004
0x07D3 (2003)
Status information (Upper)
⋆４
2005
0x07D4 (2004)
Decimal point position (Lower)
32 bit binary representation
2006
0x07D5 (2005)
Decimal point position (Upper)
2007
～
2012
0x07D6
～
0x07DB
(2006
～
20011)
No function
2013
0x07DC (2012)
Weighing unit (Lower)
32 bit binary representation
2014
0x07DD (2013)
Weighing unit (Upper)
2015
0x07DE (2014)
Response characteristics
(Lower)
⋆
5
32 bit binary representation
2016
0x07DF (2015)
Response characteristics
(Upper)
⋆
5
2017
0x07E0 (2016)
Calibration status (Lower)
⋆
5
32 bit binary representation
2018
0x07E1 (2017)
Calibration status (Upper)
⋆
5
2019
0x07E2 (2018)
Calibration weight value
（
Lower
）
⋆
5
32 bit binary representation
2020
0x07E3 (2019)
Calibration weight value
（
Upper
）
⋆
5
⋆
3
．
It cannot be rewritten by writing from the master.
⋆
4
．
The function is limited if connected to other than AD-4212C/D.
⋆
5
．
Can be used only when connected to the AD-4212C/D.
