Microscan MS-4X Bedienungsanleitung Seite 356

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Seitenansicht 355
A-22
MS-4X Imager Us
er Manual
Communications Protocol
Setup 2
Transfer 1
Transfer 2
Starting with a ‘RES’ ensures a clean transaction, without “leftovers” from the previous
transaction.
Error Condition 1
Address 0x01 (translates to) Poll Req @ ‘0x1C’, Unit Select @ ‘0x1D’
RES 0x04
REQ 0x05
STX 0x02
ETX 0x03
ACK 0x06
NAK 0x15
LRC enabled
HOST_TX ‘RES’ ‘0x1D’ ‘REQ’ (Select Unit 1 to receive data)
IMAGER_TX ‘0x1D’ ‘ACK’ (Unit responds with its address)
HOST_TX ‘STX’ <T> ‘ETX’ ‘LRC’
IMAGER_TX ‘0x1D’ ‘ACK’ (Unit responds with its address)
HOST_TX ‘RES’ (Terminate Transfer 2)
HOST_TX ‘RES’ ‘0x1C’ ‘REQ’ (Poll Unit 1 for data)
IMAGER_TX ‘0x1C’ ‘STX’ <T/00000> ‘ETX’ ‘LRC’
IMAGER_TX ‘ACK’
HOST_TX ‘RES’ (Terminate Transfer 1)
HOST_TX ‘RES’ ‘0x1C’ ‘REQ’ (Poll Unit 1 for data)
IMAGER_TX ‘0x1C’ ‘STX’ <T/00000> ‘ETX’ ‘LRC’
HOST_TX Nothing’ (Host should ‘ACK’ here)
timeout reached...
IMAGER_TX ‘REQ’ (Unit requests an ‘ACK’ again)
timeout reached...
IMAGER_TX ‘REQ’ (Unit requests an ‘ACK’ again)
timeout reached...
IMAGER_TX ‘REQ’ (Unit requests an ‘ACK’ again)
timeout reached...
IMAGER_TX ‘RES’ (Terminate Transfer 1, data is flushed)
Seitenansicht 355
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