Microscan MS-4X User Manual page 350

Communications Protocol
ACK/NAK Data Flow Examples
Setup 1
RES 0x00 (disabled)
REQ 0x00 (disabled)
STX 0x00 (disabled)
ETX 0x00 (disabled)
ACK 0x06
NAK 0x15
LRC disabled
Transfer 1
HOST_TX
IMAGER_TX
Transfer 2
HOST_TX
IMAGER_TX
IMAGER_TX
HOST_TX
Error Condition
Transfer 1
IMAGER_TX
HOST_TX
IMAGER_TX
HOST_TX
Transfer 2
HOST_TX
IMAGER_TX
IMAGER_TX
timeout reached...
timeout reached...
timeout reached...
Timeout Reached
A-16
<K141,0>
'ACK'
<K141?>
'ACK'
<K141,0>
'ACK'
symbol data
'NAK' (host rejects)
symbol data (resend data)
'ACK' (transaction complete)
<K141?>
'ACK'
<K141,0>
transaction aborted, data is flushed
MS-4X Imager User's Manual