Printed in the Federal Republic of Germany
TR-Electronic GmbH 2019, All Rights Reserved
01/17/2019
TR - ECE - BA - DGB - 0146 - 00
Page 37 of 47
4 ASI interface
The
ASI
data communication is an
A
synchronous-
S
erial transmission. The electrical
data corresponds to the RS422 interface with two lines for the inverted and the non-
inverted signal.
The baud rate of the ASI data transmission is adjustable and is 9600 baud by default.
A user data sign has a length of up to 12 bits and is composed of 8 data bits together
with 1 start bit, 1 parity bit and 1 or 2 stop bits. From 4 to 8 user data signs with one
CRC and one CR character can be transmitted per message. After the transmission of
a message follows a pause of
1.5 signs.
In order to ensure perfect data transmission, twisted pair data lines must always be
used.
4.1 Telegram format
Sign 1 to 8:
Bit
Content
2
0
Start bit
2
1
Data (LSB)
User data
2
2
Data
2
3
Data
2
4
Data
2
5
Data
2
6
Data
2
7
Data
2
8
Data (MSB)
2
9
Parity bit *
2
10
Stop bit 1
2
11
Stop bit 2 *
Message:
Byte
Content
1
Sign 1
2
Sign 2
3
Sign 3
4
Sign 4
5
Sign 5 *
6
Sign 6 *
7
Sign 7 *
8
Sign 8 *
9
CRC Sign (see chapter 4.2
10
CR Sign (carriage return) *
* optional (depending on the TRWinProg settings)
