Rs232 Interface - Datalogic DS8100A Reference Manual

3

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
TX
RX
RTS
CTS
SGND
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).
Figure 13 – RS232 Main Interface Connections Using Hardware Handshaking
+ V
RTS
- V
+ V
TX DATA
- V
+ V
CTS
- V
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.
16
Function
Transmit Data
Receive Data
Request To Send
Clear To Send
Signal Ground
SCANNER
START
OF
TRANSMISSION
DATA
TRANSMISSION
C1 C2
TRANSMISSION
STOPPED
ENABLED
DISABLED
IDLE
Figure 14 - RS232 Control Signals
DS8100A REFERENCE MANUAL
USER INTERFACE
SGND RXD TXD
CTS RTS
SGND TX RX
RTS CTS
END
OF
TRANSMISSION
DATA
TRANSMISSION
C4 C5
C3
ENABLED
IDLE