ETT 412
BUILD-IN TOUCH TERMINAL
Page 16
12.03.2019
7
CAN Bus Protocol
Display communication CAN object number:
CAN bus object for receiving data: 0x020 + CAN bus station (0x00
– 0x1F)
CAN bus object for sending data: 0x040 + CAN bus station (0x00
– 0x1F)
8
CAN Bus Setup
This section explains how to configure a CAN bus correctly. The following parameters must
first be set: Station number and data transfer rate.
During start up the parameters can be set on the setup screen of the terminal.
8.1
CAN Bus Station Number
Each CAN bus station is assigned its own station number. With this station number, data can
be exchanged with other stations connected to the bus. Up to 31 stations can be installed in
a CAN bus system. In a CAN bus system however, each station number can only be assigned
once!
8.2
CAN Bus Data Transfer Rate
Various data transfer rates (baud rates) can be set on the CAN bus. The longer the bus line
is, the lower the data transfer rate that must be selected.
Value
Baud rate
maximum length
1
500 kbits/s
80 m
2
250 kbits/s
160 m
3
125 kbits/s
320 m
4
100 kbits/s
400 m
5
50 kbits/s
800 m
6
20 kbits/s
1200 m
7
1 Mbit/s
30 m
These values apply to the following cable: 120
, Twisted Pair.
