DigiTrace TCONTROL-CONT-03 User Manual

2 Protocol description
12
2.6 Function codes
The functions described in the following are available for the readout of
measured values, device and process data as well as to write specific data.
Function-
overview
2.6.1 Read n words
This function is used to read n (n  32) words starting from a specific address.
Data request
Response
Example Reading the W1 and W2 set point values (2 words each)
Address of first word = 0x3100 (W1 set point value)
Data request:
Response (values in the Modbus float format):
Function
number
Function Limitation
0x03 or 0x04 Read n words max. 32 words (64 bytes)
0x06 Write one word max. 1 word (2 bytes)
0x10 Write n words max. 32 words (64 bytes)
v
Please refer to Chapter 2.9 Error processing, Page 18 if the device
does not react to these functions or emits an error code.
Slave
address
Function
x03 or 0x04
Address
first word
Number of
words
(max. 32)
Checksum
CRC16
1 byte 1 byte 2 byte 2 byte 2 byte
Slave
address
Function
0x03 or 0x04
Number of
bytes read
Word
value(s)
Checksum
CRC16
1 byte 1 byte 1 byte x byte 2 byte
01 03 3100 0004 4AF5
01 03 08 0000 41C8 0000 4120 4A9E
Set point value
W1
(25.0)
Set point value
W2
(10.0)

DigiTrace TCONTROL-CONT-03 Specifications

General

Brand	DigiTrace
Model	TCONTROL-CONT-03
Category	Controller
Language	English