RayTek LineScanner MP150, Руководство по протоколу

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Transmission of Scanner Commands
MP150 Protocol
Rev. B4 Aug 2019
11
3.4 Error Handling
If the scanner, upon a command or a parameter request, answers ETB instead of ACK/NAK, an error in
the scanner has occurred.
After the acknowledgment signal
ETB
from the scanner, indicating an error, the scanner only accepts
the error status parameter request:
GES
which it will respond as described in section 3.3 :
ES
<error
code>.
The meaning of the <error code> is given in table Table 1.
If other commands or parameter requests are transmitted, the scanner will continue to respond with
ETB; with the exceptions:
•
GES
to get the error,
•
CC
to switch to the calibration mode. In the Calibration mode this ETB-behaviour is switched
off.
The command itself will still be executed, even if it answers with
ETB
only.
In case of recoverable errors, the reset of the error message is possible, and continued operation may be
achieved by issuing the command
ES
.
The following errors are defined and can be asked for using the
GES
command. Bit positions of multiple
errors are or-ed up in the answer as described below the table.
error
bit hexadecimal
representation Description What is to do? reflected in
the ETB-
answer
0 1hex checksum error in the user parameter section PS yes
1 2hex checksum error in the calibration parameter section %PS yes
2 4hex checksum error in the temperature table section %TTS yes
3 8hex device in warm-up wait some
minutes no
4 10hex bias voltage out of range service yes
5 20hex checksum error in the service parameter section service / may be
ignored
no
6 40hex detector cooler voltage out of range device may be
too warm; if not -
service
yes
7 80hex internal temperature over range cooling no
30 40000000hex no zero-pulse is arriving from the encoder – probably the
motor is not rotating
service yes
31 80000000hex motor is rotating but no data is arriving at the ad-converters service yes
Table 1
Example 1: active error bits 0, 1, 30 result in the answer 40000003 (1hex + 2hex + 40000000hex)
Example 2: active error bits 0, 1, 3 result in the answer:
Result / answer: 1hex + 2hex + 8hex = Bhex