Datalogic DS8100A-3115 Instrukcja Instalacji Pobierz pdf (Strona 36)

DS8100A REFERENCE MANUAL

3.2.1 RS232 Interface

The main 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

configuring the scanner. This is the default setting.

The following pins are used for RS232 interface connection:

CBX100/500

Function

TX Transmit Data

RX Receive Data

RTS Request To Send

CTS Clear To Send

SGND Signal Ground

It is always advisable to use shielded cables. If the shield is tied to ground at the Host, then

leave it floating at the CBX. If it is floating at the Host then tie it to Shield at the CBX. The

overall maximum cable length must be less than 15 m (50 ft).

SGND RXD TXD

CTS RTS

USER INTERFACE

SGND TX RX

RTS CTS

SCANNER

Figure 16 – RS232 Main Interface Connections Using Hardware Handshaking

START

TRANSMISSION

END

TRANSMISSION

+ V

RTS

- V

+ V

TX DATA

- V

+ V

CTS

- V

DATA

TRANSMISSION

DATA

TRANSMISSION

STOPPED

ENABLED

DISABLED

ENABLED

IDLE

Figure 17 - RS232 Control Signals

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

If the RTS/CTS handshaking protocol is enabled, the DS8100A activates the RTS output to

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

the transmission.

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