Opticon OPR 3201 - Figure 16: Modem Transmit Data

Opticon
OPR 3201
Specifications Manual
22
c) MODEM
The scanner turns RTS line ON before transmitting data. Other processes are
the same as BUSY/READY.
Figure 16: Modem transmit data
d) XON/XOFF CONTROL
During data transmission
While this configuration is enabled, the OPR 3201 keeps on sending data until
it receives a control code XOFF (ASCII DC3, Hex13). It stops the data
transmission once it receives the control code XOFF (ASCII DC3, Hex13). It
re-starts sending the data when it receives a control code XON (ASCII DC1,
Hex11).
During data reception
While this configuration is enabled, the OPR 3201 sends a control code XOFF
(ASCII DC3, Hex13) to the host if the remaining buffer capacity for data
reception gets low. When the buffer empties after the completion of buffer
processing, the OPR 3201 sends a control code XON (ASCII DC1, Hex11) to
the host and re-starts processing the received data.
If any of the following occurs, the scanner sends a control code XOFF (ASCII
DC3, Hex13) to the host while it is processing the data reception.
• RS-232C interface—When the remaining buffer capacity becomes smaller
than 16 bytes.
• USB-VCP interface—When the remaining buffer capacity becomes
smaller than 128 bytes.