Host Echo; Host Echo Quiet Interval; Signal Voltage: Normal/Ttl; Rs-232 Invert - PSC QuickScan QS6500 Reference Manual

Interface Related Features
RS-232 Interface Features — cont.

Host Echo

When enabled, this feature passes all data through the imager to the host
as it comes in. This feature is used for applications where "daisy chain-
ing" 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 requir-
ing transmission to the host, the scanner will wait for the RS-232 chan-
nel to be quiet for a specified period of time (set via
RS-232 Host Echo
). The scanner can be set to observe this delay before send-
Quiet Interval
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 imager 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.
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