SEC 3120 16-bit Modbus Manual
Page 3 Of 46
Sensor Electronics Corporation
For Version 1.2 and above
December 2012
P/N 1580282, Rev. 1, 20121228
General Description
About The SEC 3120 Digital Gas Transmitter
The SEC 3120 Digital Gas Transmitter is the latest generation Gas Transmitter
from Sensor Electronics Corporation, and is fully compatible
with its predecessor, the SEC 3100. The SEC 3120 Digital Gas
Transmitter allows multiple single and multi-channel SEC
sensors to be connected to it and acts as a central
communication, control, status and data logging hub for them.
While the SEC 3100 did not provide full 16-bit standard
Modbus (PI-MBUS-300 Rev. J. compliance) support, the
special SEC 3100MB16 does and is compatible with the SEC
3120 which provides full (relevant) compliance and major
feature and sensor consolidation capabilities, as well as optional sensor redundancy.
SEC 3120 Modbus Standard Supported
The SEC 3120 Digital Gas Transmitter supports master mode communication as a
Modbus RTU slave. While it supports other Modbus interfaces, this document addresses
the specific 16-bit standard Modbus protocol as described in the Modicon Modbus
Specification PI-MBUS-300 Rev. J. The reader should familiarize themselves with this
document to fully understand and utilized this Modbus interface.
16-bit Modbus Supported Features and Functions Overview
Functions Codes -
03 - Read Multiple Holding Registers (supported fully)
06 - Preset Single Holding Register (supported fully)
16 - Preset/Write Multiple Holding Registers (supported fully)
01 - Read Coils
(not supported)
05 - Force Single Coil
(not supported)
15 - Force/Write Multiple Coils
(not supported)
07 - Read Exception Register
(not supported)
Broadcast (Network ID 0) for all other function codes is
not supported, except for
Preset (code 06) Holding Register 42920 (Listen Only Modbus Mode) and 42921
(Resume from Listen Only Modbus Mode).
All other function codes are not supported for broadcast mode in this interface.
Summary of Contents for SEC 3000
Page 15: ...Doc 1460003 Rev A Operation Manual SEC 3000 Electro Chemical Gas Sensor Page 12 of 13 ...
Page 54: ...Part Number 3100 EXP MANUAL REV 11 20141007 FIGURE 4 SEC 3100 SEC Millenium Mounting ...
Page 55: ...Part Number 3100 EXP MANUAL REV 11 20141007 FIGURE 5 SEC 3100 SEC 3000 Mounting ...
Page 56: ...TB 1 J1 TB 2 J2 1 6 1 6 1 4 1 6 TB 5 J5 TB 6 J6 ...
Page 148: ...SEC 3120 Wiring TB 1 P3 TB 2 P6 1 6 1 6 1 2 3 4 1 2 3 4 7 6 5 4 3 2 1 TB 3 P1 TB 4 P5 ...
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