Omron V500-R521B2 User Manual page 40

Communication protocol
There are following two types of system to transmit the data read by the bar code
reader to the upper equipment.
Nonprocedural system (no protocol system)
The bar code reader transmits the data to the upper equipment and ends.
Bar code reader
V500-R521
Data
Upper equipment
ACK/NAK system
This bar code reader waits for the upper equipment response after transmitting the data.
When ACK (06H) 1 byte is received from the upper equipment, buzzer sounds
indicating the normal finishing and ends data transmission.
Bar code reader
V500-R521
Data
Upper equipment
When NAK (15H) 1 byte is received from the upper equipment data is transmitted
again. When the time-up time comes which is set beforehand, the time-up buzzer
sounds and the data transmission ends.
Bar code reader
V500-R521
Data
Upper equipment
End
End
Data
Section 3
Function Explanation
Data
V500-R521B2/C2
User's Manual
41