Omron V500-R521B2 User Manual page 104

Section 5
Example of System Configuration
Polling (P)
When the transmission procedure is "Normal procedure (polling procedure)", transmit
the oldest data in the buffer as a response.
Input command
$01
(Machine No.)
Response
When there is data in buffer
$01
(Machine No.)
When there is no data in buffer
$01
(Machine No.)
In case of "Through procedure (normal output procedure)", no response is output even
if command is input.
Resend request (R)
The response sent before is transmitted again.
Input command
$01
(Machine No.)
Response
$01
(Machine No.)
V500-R521B2/C2
106
User's Manual
$10 P
(Check code)
Communication data with the bar code reader
7 4
(Check code)
Code indicating that there is no data
$10 R (Check code)
Communication data with the bar code (same as immediately before)
$0D
$0D
$0D
$0D
(Check code)
$0D
(Check code)