Omron Z550 Operation Manual page 214

SECTION 6
Communication with External Devices
Flow of XMODEM Communication
Measurement
XMODEM switch
Start response
to the request
(send BK No. 1)
No response when
"C" is sent
(Send BK No. 2)
Send the same
BK No. again when
"NAK" is received.
(Send BK No. 24)
Transmission of
all data completed
Measurement
completed
*1 In the case of 1024 lines, for each line represented by three bytes of data, the measurement data is
sent as 25 packets (1024 lines x 24 bits / 128 bytes = 24, plus 1 header packet = 25).
*2 The flow will be the same when profile data is output via XMODEM transmission in the case of the
TRG terminal block.
Packet division
Packet 1
128byte
Header area
Z550
212
Operation Manual
CAPTURE command
Send "READY"
NAK(a)
128 bytes of data
(BK No. 1)
ACK
128 bytes of data
(BK No. 2)
ACK
128 bytes of data
(BK No. 24)
ACK
EOT
ACK
OK
Packet 2
128byte
Data of 1 to 1024 lines (3 bytes x 1024)
Host device
Instruct to
start measurement
XMODEM switch
reception request
1 packet =
128/1024 bytes
(CRC check
performed)
Normal reception
of data
Return "NAK" if
*1
data reception
is abnormal.
Normal reception
of data
XMODEM abort
Packet 25
128byte
Dummy data (00h)
*2