Datalogic DS8100A, Reference Manual

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DS8100A REFERENCE MANUAL
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4.2.1 RS232 Interface
The main serial interface is used for communication with the Host computer and allows both
transmission of code data and configuring the scanner. The overall maximum cable length
should not exceed 15 m (50 ft).
The following pins of the 26-pin connector are used for RS232 interface connection:
Pin Name Function
2 TX Transmit
3 RX Receive
4 RTS Request to send
5 CTS Clear to send
7 GND_ISO Main signal ground
DS8100A
7 GND_ISO
SGND Main Isolated
USER INTERFACE
RTS 4
CTS
5
RX 3
RXD
TX 2
TXD
1
Earth
Ground
CHASSIS
Figure 45 - RS232 Connections
START
OF
TRANSMISSION
END
OF
TRANSMISSION
+ V
RTS
- V
+ V
TX DATA
- V
+ V
CTS
- V
DATA
TRANSMISSION
DATA
TRANSMISSION
C1 C2 C4 C3
C5
TRANSMISSION
STOPPED
ENABLED
DISABLED
ENABLED
IDLE
IDLE
Figure 46 - RS232 Control Signals
The RTS and CTS signals control data transmission and synchronize the connected devices.
If the RTS/CTS hardware protocol is enabled, the DS8100A activates the RTS output to
indicate a message can be transmitted. The receiving unit must activate the CTS input to
enable the transmission.