Teledyne 7500 Instruction Manual page 19

Infrared gas analyzer communication functions (modbus)
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(3) Message transmission (example)
The following shows an example of reading out from No. 1 station the setting CH5
measurement concentration, decimal point position and measuring unit.
Relative address of CH5 measurement concentration setting: 000C
Data number: 03
H
Command message composition (byte)
Station No.
Function code
Read-out start No.
(relative address)
Read-out word
number
CRC data
* Meaning of read-out data
First word data contents 04 0D
Next word data contents 00 02
Latest word data contents 00 00D
In the above case, measurement concentration = 12.00 vol%
*For handling of the decimal point and unit, refer to Section 7.1.
01
H
04
H
Upper
00
H
Lower
0C
H
Upper
00
H
Lower
03
H
Lower
70
H
Upper
08
H
= 1200
H
= 2 (decimal point position)
H
= 0 (vol %)
H
Teledyne Analytical Instruments
H
Response message composition (byte)
Station No.
Function code
Read-out byte number
Contents of the
first word data
Contents of the
next word data
Contents of the
last word data
CRC data
19
01
H
03
H
04
H
Upper
00
H
Lower
00
H
Upper
03
H
Lower
E8
H
Upper
00
H
Lower
00
H
Lower
81
H
Upper
0D
H

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