Page 130 - Gas Detection Systems Training Manual

Internal Register Address
2921
2922
2923 2924
Holding Register Address 42922
42923
42924 42925
Function Code 03- Read Unit Register Description (Data bits and Parameter Specifics)
Maximum number of sensors that can be attached
(Allows master to determine if device is a SEC 3100MB16, which only supports one sensor, or an advanced transmitter such as the SEC 3120 which supports at least two sensors) Unit Type Code (0x0100 or 256 decimal)- SEC 3100MB16, (0x0101 or 257 decimal)- SEC 3120 Dual Sensor, (0x0111 or 273 decimal)- SEC 3120 supporting multiple logical sub-channels, other values TBD...
Unit Firmware Version Word 1 (Major version- MSB {0 - 255}, Minor version- LSB {0 - 255})
Unit Firmware Version Word 2 (Revision/Build number- 16-bit build number increment, 0 - 65535)
Table 8: Sensor Status Code Parameter Table
Value (Hex)
Description
0000
Sensor is running, normal mode. All is well, OK.
0001
Not used.
0002
Sensor Zero Calibrating.
0003
Sensor Span Calibrating.
0004
Sensor 4-20ma Calibrating.
0005
Sensor in Warm-up.
0006
Sensor in Power Up Fault.
0007
Sensor in Calibration Fault.
0008
Sensor in Span Fault.
0009
Sensor in Unit Fault.
000A
Sensor in Optics Fault.
000B
Sensor in Zero Drift Fault.
000C
Sensor in Configuration Fault.
000D
Sensor in Hot Zero Calibration.
000E
Sensor in Cool Zero Calibration.
000F
Sensor in Self Test Operation.
0010
Sensor in Reference Channel Fault.
0011
Sensor in Active Channel Fault.
0012
Sensor in Power Fault.
0013 - 00FF
Other values t.b.d.
SEC 3120 16-bit Modbus Manual Page 29 Of 46 Sensor Electronics Corporation For Version 1.2 and above December 2012 P/N 1580282, Rev. 1, 20121228