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Interface Related Features
3-18 PowerScan
®
7000 Linear Imager
RS-232 Interface Features — cont.
Host Echo
When enabled, this feature passes all data through the scanner to the
host as it comes in. This feature is used for applications where “daisy
chaining” of RS-232 devices onto the same cable is necessary. If, for
example, one of the devices in the chain is a terminal where someone is
entering data while another person is simultaneously scanning a bar code
requiring transmission to the host, the scanner will wait for the RS-232
channel to be quiet for a specified period of time (set via
RS-232 Host Echo
Quiet Interval
). The scanner can be set to observe this delay before send-
ing its data in order to avoid RS-232 transmission conflicts.
Host Echo Quiet Interval
This setting specifies the time interval of RS-232 channel inactivity
which must transpire before the scanner will break the host echo loop to
transmit the bar code data that has just been scanned to the host.
Signal Voltage: Normal/TTL
Specifies whether the RS-232 interface provides TTL levels on the out-
put pins TxD and RTS.
RS-232 Invert
Enables/disables inversion of RS-232 TXD and RXD signals.