User Manual

Controller user's manual INDU-50 v1.95(86)EN
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*from the front IP 65
**the front - the resistance to strong cleaning agents used in the food industry
17. Transmission parameters
Transmission characteristics
 Interface: RS-485
 Transmission protocol: MODBUS RTU
 Transmission parameters: 1 start bit, 8 data bits, 2 stop bits, without parity check
 Transmission speed: 9600 bit/sec
Measurement results readout
Adress
Function
Sub-
function
Length H
Length L
Data
CRC L
CRC H
8 bits
8 bits
8 bits
8 bits
8 bits
8 bits
8 bits
8 bits
Designations
 ADRESS – address of the SLAVE device
 FUNCTION – function number
 SUB-FUNCTION – sub-function number
 LENGTH (H, L) – total frame length
 DATA – N-bytes of data
 CRC (H, L) – low byte and high byte CRC 16
Sub-functions for the measurement readout function: 46 HEX (70 DEC)
Measurement results readout
Sub-funtctions
number
Feedback
Interpretation
Lenght
Byte number in
the frame (*)
0 HEX
(0 DEC)
Measurement
results readout
Channel 1 *10 (entry in the
complementary code to 2)
2 bytes
5
6
Channel 2 *10 (entry in the
complementary code to 2)
2 bytes
7
8
Channel 3 *10 (entry in the
complementary code to 2)
2 bytes
9
10
Attention!
(1)
Value 0xF448 on any of the channels means no measurement (defective sensor or no sensor).
Example of a query (values in HEX): 01 46 00 00 07 4D 4A.