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Appendix A Modbus register maps
Important Note: The Modbus register tables in this section may become updated.
Contact Hach Company for updated tables.
This section describes the Modbus registers that are used to communicate with Met One
6000 series particle counters. These registers are applicable to units that have RS485
serial output with Modbus RTU protocol or Ethernet output with ModbusTCP protocol.
Detailed descriptions of the Modbus registers are available from the manufacturer.
• Each register is 16-bits wide (2 bytes). Some values use more than one sequential
register (e.g., model number = 20 bytes, which is 10 registers long).
• Access codes R/W/P = read/write/protected.
A.1 Identity information
The identity block contains basic information about the instrument (refer to Table 16).
These registers can only be configured at the factory and by qualified service personnel.
Table 16 Modbus register for identity information
Address Register description Access Size (bytes) Data format
0–14 Manufacturer ID
1
R 30 Printable ASCII (0x20–0x7E)
15–24 Model number
1
R/P 20 Printable ASCII (0x20–0x7E)
25–29 Serial number
1
R/P 10 Printable ASCII (0x20–0x7E)
30–33 Sensor ID
1
R/P 8 Printable ASCII (0x20–0x7E)
34 Last calibration date—year R/P 2 YY (0–9999)
35 Last calibration date—month, day R/P 2 MD (1–12, 1–31)
36 Calibration due date—year R/P 2 YY (0–9999)
37 Calibration due date—month/day R/P 2 MD (1–12, 1–31)
38 Firmware version (counter)
2,
3
R 2 100 = V1.00
39 Hardware version
2
R 2 100 = V1.00
40 Reserved 2
41–99 Expansion
1
Each 16-bit register contains two 8-bit characters. For example, 0x3838, 0x3031 and 0x0000 for model number = "8801"
(upper byte of first address = 0x38, which is ASCII '8', and lower byte = 0x38, which is ASCII '8'). A register byte value of 0x00
or word value of 0x0000 indicates the end of the value.
2
The version is for the particle counter and not the Ethernet.
3
If the value is 1–26, then the value represents legacy firmware revision A–Z (e.g. a value of 3 represents revision C). A
decimal value of 101 indicates firmware version 1.01.
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