Configuring the Encompass 4 Reader
8-19
Communications Protocol
Use the following procedures to set communications protocol. Consult sections “610
Select Basic Communication Protocol (Factory Default)" th
rough “612NN Select
Error Correcting Protocol Timeout” on page 7-31 for more information.
Caution
Do not switch to ECP (command #611) unless the host is prepared to acknowledge
each reader transmission.
To select a communications protocol
1. Ensure that the host computer is
in command mode.
2. Enter command #610 t
o select basic protocol (factory default) or command
#611 to select ECP and press ENTER.
Software Flow Control
Two modes of flow control are supported — software (XON/XOFF) and hardware
(CTS - clear to send). The host can enable or disable flow control with command
#614N Select Flow Control Option.
The host can use software control characters (XON/XOFF) or the hardware CTS
ha
ndshake line to interrupt reader transmissions. When the reader is configured for
software flow control, it stops transmitting if it receives the XOFF character from the
host (host software command 13H). It resumes transmitting only when it receives the
XON character (host software command 11H) from the host. Likewise, when the
reader is configured for hardware flow control, it stops transmitting if it detects that
the CTS line is no longer asserted. It resumes transmitting when this line is asserted. If
flow control is not needed, the reader should be configured for no flow control
(#6140 Disable Flow Control).
Note: T
ransCore recommends that XON/XOFF flow control be disabled while using
the error correcting protocol.
Use the following procedure to set flow control parameters using
the terminal emula-
tion program. See section “614N Select Flow Control Option” on page 7-32.
To select flow control
1. Ensure that the host computer is
in command mode.
2. Enter command #6140 to disable flow control, command #614
1 to enable
software flow control (factory default), or command #6142 to enable hardware
flow control and press ENTER.
Fine-Tuning and Verifying the Read Zone
If the read zone is too wide or too deep for your application, it can be fine-tuned by
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