2 - 10 IMAGETEAM™ 2020/5620 System Manual

RS-232 Handshaking
RS-232 Handshaking allows control of data transmission from the Imager using
software commands from the host device. CTS/RTS operates in mode 2. When
this feature is turned

Off

, no data flow control is used. When Data Flow Control
is turned

On

, the host device suspends transmission by sending the XOFF
character (DC3, hex 13) to the Imager. To resume transmission, the host sends
the XON character (DC1, hex 11). Data transmission continues where it left off
when XOFF was sent.

Default = RTS/CTS, XON/XOFF and ACK/NAKOff.

Host ACK Selection
Some applications require that the host terminal (or server) approve or reject
incoming bar code data and notify the operator of these actions. These
applications require that the host maintain control over the response indicators
emitted from the source scanner. Turning the Host ACK selection on, configures
the cordless system scanners to respond to commands from the host system.
The following criteria must be met for the Host ACK to work correctly:
• The cordless system must be configured for “Host Port RS-232” (Terminal ID
= 000)
• RTS/CTS is defaulted off. You must enable it if the host system requires it.
• Host ACK must be enabled (page 2-11).
• System performance degrades when using Host ACK at rates lower than
9600.
• The host terminal software must be capable of interpreting the bar code data,
make decisions based on the data content, and send out appropriate escape
commands to the source scanner.
Escape commands are addressed to the source scanner via “Application Work
Groups.” Once a command is sent, all scanners in a group respond to that
command. Because of this situation, it is recommended that each scanner is
assigned to its own group in host ACK mode.
RTS/CTS On
* XON/OFF Off
* RTS/CTS Off
XON/XOFF On
ACK/NAK On
* ACK/NAK Off