41
V500-R521B2/C2
User’s Manual
Sec
tion
3
Oper
ation
Flow Cha
rt
Section 3
Function Explanation
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.
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.
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.
Data
End
Bar code reader
V500-R521
Upper equipment
Data
End
Bar code reader
V500-R521
Upper equipment
Data
Data
Data
Bar code reader
V500-R521
Upper equipment
V500-R521.book 41 ページ 2008年7月18日 金曜日 午後1時1分