MATRIX 400™ REFERENCE MANUAL
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4
4.2.1 RS232 Interface
The RS232 interface can be used for Point-to-Point, Pass Through or Master/Slave
connections. When it is connected to the host computer it allows both transmission of code
data and reader configuration by VisiSet™.
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. 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
READER
Figure 50 – RS232 Main Interface Connections Using Hardware Handshaking
The RTS and CTS signals control data transmission and synchronize the connected devices.
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 51 - RS232 Control Signals
If the RTS/CTS handshaking protocol is enabled, the Matrix 400™ activates the RTS output
to indicate a message is to be transmitted. The receiving unit activates the CTS input to
enable the transmission.