Rs232 Interface - Datalogic DS2100N Reference Manual

5

5.2.1 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:
25-pin Name
2 TX
3 RX
4 RTS
5 CTS
7 GND
It is always advisable to use shielded cables. The overall maximum cable length must be
less than 15 m (49.2 ft).
Figure 45 – RS232 Main Interface Connections Using Hardware Handshaking
The RTS and CTS signals control data transmission and synchronize the connected devices.
+ V
RTS
- V
+ V
TX DATA
- V
+ V
CTS
- V
If the RTS/CTS handshaking protocol is enabled, the DS2100N activates the RTS output to
indicate a message is to be transmitted. The receiving unit activates the CTS input to enable
the transmission.
50
Function
Transmit Data
Receive Data
Request To Send
Clear To Send
Ground
DS2100N
TX
2
3 RX
RTS
4
5 CTS
7 GND
Chassis 1
START
OF
TRANSMISSION
DATA
TRANSMISSION
C1 C2
TRANSMISSION
ENABLED
DISABLED
IDLE
Figure 46 - RS232 Control Signals
DS2100N REFERENCE MANUAL
USER INTERFACE
RXD
TXD
CTS
RTS
GND
TRANSMISSION
DATA
TRANSMISSION
C3 C4 C5
STOPPED
ENABLED
END
OF
IDLE