YOKOGAWA DO71, Manual, Page: 9 / 19

MODBUS Communication
– Hold Register DO
9
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2.1 Hold Register DO
If applicable, in the Value/description field the Factory Default setting (D), Low limit setting (L) and
High limit setting (H) are explained. NaN does mean that there is Not a Number defined.
NOTE
Because no limit checks are implemented, incorrect settings or settings outside the specified range
are accepted as is. Please take care that settings are done correctly and within the specified range.
Address Item name Data type Access Value / description
1031 Firmware version
ASCII R
Alphanumeric Firmware version code:
16 bytes, 8 addresses
2089 Oxygen unit Uint32 R/W
0x 0000 0010 % vol O
2
0x 0000 0020 % air saturation
0x 0000 0040 ppb (µg/L)
2)
0x 0000 0080 ppm (mg/L)
2)
0x 0400 0000 µmol/L
2)
0x 0800 0000 % DO saturation
0x 2000 0000 hPa (mbar)
0x 4000 0000 ppm gas
1) 2)
0x 8000 0000 Torr
Remark:
1) ppm gas only possible with DO72-T
2) Setting not possible in
m
easurement mode “Dry”
(register HR5703)
D: % DO saturation
2091 Oxygen value Float R
Calculated oxygen value in oxygen unit
as defined in register HR2089
Remark:
1) The calculated oxygen value is only
updated if an interval rate is set
(register HR3499)
2) When value is -999 this means
there is no calculated output
2093 Error Uint32
R
For details see Section 3.1
2409 Temperature Unit Uint32 R/W
0x 0000 0002 K
0x 0000 0004 °C
0x 0000 0008 °F
D: °C
2411 Temperature Value Float R
Measured temperature value used for
temperature compensation