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CBX ELECTRICAL CONNECTIONS
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 Matrix 450™ activates the RTS output
to indicate a message is to be transmitted. The receiving unit activates the CTS input to
enable the transmission.
4.2.2 RS485 Full-Duplex Interface
The RS485 full-duplex (5 wires + shield) interface is used for non-polled communication
protocols in point-to-point connections over longer distances (max 1200 m / 3940 ft) than
those acceptable for RS232 communications or in electrically noisy environments.
The CBX pinout follows:
CBX100/500
TX+
RX+
TX-
RX-
SGND
START
OF
TRANSMISSION
DATA
TRANSMISSION
C1 C2
TRANSMISSION
STOPPED
ENABLED
DISABLED
IDLE
Figure 30 - RS232 Control Signals
Function
RS485 Transmit Data +
RS485 Receive Data +
RS485 Transmit Data -
RS485 Receive Data -
Signal Ground
READER
Figure 31 - RS485 Full-duplex Connections
END
OF
TRANSMISSION
DATA
TRANSMISSION
C3
C4
C5
ENABLED
USER INTERFACE
RX485+ TX485+
SGND
RX485-
TX485-
SGND TX+
RX+
TX-
RX-
IDLE
4
53
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