Figure 11: Busy/Ready Communication; Figure 12: Cannot Receive Command - Opticon OPL 7836 Specification Manual

b) BUSY/READY
The scanner and the host computer notify each other of their state and
whether they can receive data with BUSY/READY through an RTS line. They
can communicate state to each other through a CTS line when connected as
in the following figure.

Figure 11: Busy/Ready communication

The scanner stays ON (is able to receive data) except during certain parts of
the process, such as receiving data (buzzer command execution), transmitting
data, and menu processing. The scanner checks the CTS line before
transmitting data. When it is ON, the scanner transmits data. When it is OFF,
the scanner waits for it to turn ON within a set time. The scanner will abort
transmission with an error indication (buzzer) when the CTS line is not ON
within a specified period. The Flow Control time-outs are as follows, and the
default setting is "indefinitely" (I0).
Flow Control Time Out
Indefinitely
100 ms
200 ms
400 ms

Figure 12: Cannot receive command

Menu/Command
I0
I1
I2
I3
19
Opticon
OPL 7836
Specifications Manual