Datalogic QLM500 Installation Manual download pdf (Page 51)

CBX ELECTRICAL CONNECTIONS

4.2.1 RS232 Interface

The serial interface is used in this case for point-to-point connections; it handles

communication with the host computer and allows both transmission of code data and the

programming of the scanner. This is the default setting.

The following pins are used for RS232 interface connection:

CBX100/500

Function

Transmit Data

Receive Data

RTS

Request To Send

CTS

Clear To Send

SGND

Signal Ground

It is always advisable to use shielded cables. The overall maximum cable length must be

less than 15 m (49.2 ft).

SGND RXD TXD

CTS RTS

USER INTERFACE

SGND TX RX

RTS CTS

SCANNER

Figure 39 – RS232 Main Interface Connections Using Hardware Handshaking

The RTS and CTS signals control data transmission and synchronize the connected devices.

Figure 40 - RS232 Control Signals

If the RTS/CTS handshaking protocol is enabled, the DS2400N activates the RTS output to

indicate a message is to be transmitted. The receiving unit activates the CTS input to enable

the transmission.

START

TRANSMISSION

END

TRANSMISSION

+ V

RTS

- V

+ V

TX DATA

- V

+ V

CTS

- V

DATA

TRANSMISSION

DATA

TRANSMISSION

STOPPED

ENABLED

DISABLED

ENABLED

IDLE

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