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E.7
BUS485 – Telegram
The format BUS485 is used for the synchronization of devices over RS 485 and is
therefore only available on ETC's RS422 interface. The telegrams are addressed as
broadcast (destination address h'00FF). For this message the number of the data bits
has to be set to "8 Bits", because the telegram content is not ASCII but hexadecimal
coded.
Byte: Meaning:
Character: HEX
Code:
1
Start character (High Byte)
FE
2
Start character (Low Byte)
01
3
Length of data packet (High Byte)
0E
4
Length of data packet (Low Byte)
00
5
Command (High Byte)
00
6
Command (Low Byte)
01
7
Destination address (High Byte)
00
8
Destination address (Low Byte)
FF
9
Source address (High Byte)
00
10
Source address (Low Byte)
7F
11
Compact time byte 1 (Seconds since 1.1.1993)
00..FF
12
Compact time byte 2 (Seconds since 1.1.1993)
00..FF
13
Compact time byte 3 (Seconds since 1.1.1993)
00..FF
14
Compact time byte 4 (Seconds since 1.1.1993)
00..FF
15
Compact time byte 5 (Milliseconds High Byte)
00
16
Compact time byte 6 (Milliseconds Low Byte)
00
17
CRC16 check sum (High Byte)
00..FF
18
CRC16 check sum (Low Byte)
00..FF
19
Telegram end character (High Byte)
FE
20
Telegram end character (Low Byte)
02
