Datalogic Scanning QS2500 Benutzerhandbuch

The communication uses only TxD and RxD signals, without 

regard for any hardware or software handshaking protocol.

If the QS2500 wants to send the bar code data to the host com-

puter, it will issue the RTS signal first, wait for the CTS signal 
from the host computer, and then perform the normal data com-
munication. If there is no replied CTS signal from the host com-
puter after the timeout (response delay) duration, the QS2500 
will issue five warning beeps. 

When the host computer is unable to accept data, it sends an 

Xoff code to inform the QS2500 to suspend data transmission 
and an Xon to continue.

When the ACK/NAK protocol is used, the QS2500 waits for an 

ACK (acknowledge) or NAK (not acknowledge) from the host 
computer after data transmission. It then resends the data in 
response to a NAK.

This configures the QS2500 flow control to connect to 

the Auxiliary (AUX) port of some Datalogic omni-directional 
scanners. The QS2500 will assert RTS high to signal the scanner 
that data will be sent immediately after RTS is asserted. When 
connecting to a Datalogic scanner aux. port, additional program-
ming is required to enable transmission of code IDs for all sym-
bologies to be scanned.

This configures the RS-233 flow control to communicate to some 

Wincor (SNI) terminals.

This is the delay time between outputs of data character. It is the same as 
the intercharacter delay of the keyboard wedge.

This is the delay time between outputs of bar code data. It is the same as 
the block transmission delay of the keyboard wedge.