27
Barometric Pressure
In all probes, barometric pressure is required for barometer compensated ODO percent saturation calculations. The barometric
pressure value is set by writing an entire block of values (non-divisible) using a write multiple registers command (function code
0x10). This information can be broadcast to all devices on the network and updated periodically. The default is 760.0 or the last
calibration value given, if available.
Address
Description
R/W
Type
Default
0x0404
User Barometric Pressure Value (mmHg) [3:0]
RW
Float
760.0 or last
value from
calibration
0x0405
Request
Function Code
1 byte
0x10
Register Address
2 bytes
0x0404
Number Registers
2 bytes
0x0002
Byte Count
1 byte
0x04
Register Values
4 bytes
User Barometric Pressure Value (mmHg) [3:0]
Modbus Configuration & Commands
