Xylem ODO RTU, User Manual

Page: 19 / 44

19
Response
Function Code 1 byte 0x03
Byte Count 1 byte 0x06
Register Values 6 bytes ODO Last Calibration Time (s) [3:0]
ODO QC Score
Zero Calibration
ODO zero point calibration is accomplished by writing an entire block of values (non-divisible) using a write multiple registers
command (function code 0x10). Last calibration time can subsequently be read to verify.
Percent Saturation Calibration
ODO percent saturation calibration is accomplished by writing an entire block of values (non-divisible) using a write multiple
registers command (function code 0x10). Last calibration time can subsequently be read to verify. This calibration is done in 100%
saturated water. Barometric pressure is required to perform the calibration.
Request
Function Code 1 byte 0x10
Register Address 2 bytes 0x0220
Number Registers 2 bytes 0x0002
Byte Count 1 byte 0x04
Register Values 4 bytes ODO Zero Calibration Time (s) [3:0]
Request
Function Code 1 byte 0x10
Register Address 2 bytes 0x0230
Number Registers 2 bytes 0x0004
Byte Count 1 byte 0x08
Register Values 8 bytes ODO % Calibration Time (s) [3:0]
ODO % Calibration Barometer (mmHg) [3:0]
Address Description R/W Type Default
0x0220
ODO Zero Calibration Time (s) [3:0] W U32 N/A
0x0221
Address Description R/W Type Default
0x0230
ODO % Calibration Time (s) [3:0] W U32 N/A
0x0231
0x0232
ODO % Calibration Barometer (mmHg) [3:0] W Float N/A
0x0233
Modbus Configuration & Commands