SEC 3120 16-bit Modbus Manual
Page 25 Of 46
Sensor Electronics Corporation
For Version 1.2 and above
December 2012
P/N 1580282, Rev. 1, 20121228
Implemented Functions and Registers Defined
The function code identifies the command being issued to the device. It is one
byte in length and has a value of 1, 3, 5, 6, 15 or 16.
Table 6: Function Codes Supported By SEC 3120
Function Code
Description
1
Read Coil Status Registers (not supported)
3
Read Holding Registers
5
Force Single Coil Register (not supported)
6
Preset Single Holding Register
15
Force Multiple Coil Registers (not supported)
16
Preset Multiple Holding Registers
For the current 16-bit version, registers are only mapped for function codes 3, 6,
and 16. Otherwise an exception response will be generated.
In most cases, there is no response for a query that contains an invalid slave
address, invalid CRC data or a non-supported broadcast mode, etc. In some cases, the
unit might issue an Exception 2 as an error response if an invalid register address is
requested for a valid function code. However, if invalid function code is issued, such as
function 07 were transmitted, then an Exception 1 message would be generated to
indicate that the function code is not supported.
Query Coil Status Message
Field Name
Example (Hex)
Slave Address
01
Function Code
03
Address High
01
Address Low
5B
Num Points High
00
Num Points Low
03
CRC Low Byte
75
CRC High Byte
E4
Response Exception 2
Field Name
Example (Hex)
Slave Address
01
Function Code
83
Exception Code
02
CRC Low Byte
C0
CRC High Byte
F1
Содержание SEC 3000
Страница 15: ...Doc 1460003 Rev A Operation Manual SEC 3000 Electro Chemical Gas Sensor Page 12 of 13 ...
Страница 54: ...Part Number 3100 EXP MANUAL REV 11 20141007 FIGURE 4 SEC 3100 SEC Millenium Mounting ...
Страница 55: ...Part Number 3100 EXP MANUAL REV 11 20141007 FIGURE 5 SEC 3100 SEC 3000 Mounting ...
Страница 56: ...TB 1 J1 TB 2 J2 1 6 1 6 1 4 1 6 TB 5 J5 TB 6 J6 ...
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