RS-232 Advanced Features

Flow Control

None: The communication uses only TxD and RxD signals, without regard for any hardware or software handshaking protocol.

RTS/CTS: 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.

Xon/Xoff: 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.

ACK/NAK: 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.

Datalogic Aux. Port: 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.

Mode B: This configures the RS-233 flow control to communicate to some Wincor (SNI) terminals.

Intercharacter Delay

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

Block Transmission Delay

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

Product Reference Guide