PX 30 and PX 120 Operating Manual
3-29
Example 7: Positive Acknowledgement
Telegram has been received by the PX-unit and the command carried out.
Telegram:
Byte
1
0A
H
Start of telegram
2
08
H
Address 1 / ID-Signal 0
3
01
H
Amount of data containing back information in Bytes (Low Byte)
4
00
H
Amount of data containing back information in Bytes (High Byte)
5
06
H
1st data byte: Positive acknowledgement
6
F1
H
Check sum (CRC) of bytes 2 to 5
7
0D
H
End of telegram
Example 8: Negative acknowledgement
Telegram contained a text number under which no text was edited:
(
→
ERROR 30: no text available; record unoccupied)
Telegram:
Byte
1
0A
H
Start of telegram
2
08
H
Address 1 / ID-Signal 0
3
04
H
Amount of data containing back information in Bytes (Low Byte)
4
00
H
Amount of data containing back information in Bytes (High Byte)
5
15
H
1st data byte: Negative acknowledgement
6
00
H
2nd data byte
7
1E
H
3rd data byte: Error number 30 (Low Byte)
8
00
H
4th data byte: Error number 30 (High Byte)
9
C1
H
Check sum (CRC) of bytes 2 to 8
10
0D
H
End of telegram
Please note: When data is not received correctly (transmission error), Bytes 6, 7 and 8 will
be missing from the PX-unit's response telegram (Byte 3 = 01
H
and CRC-Byte 9 = E2
H
).
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