MATRIX 450™ REFERENCE MANUAL
52
4
4.2 MAIN SERIAL INTERFACE
CAUTION
Do not connect to the Main Interface spring clamp terminals if using Host
Interface Modules (Fieldbus) with the CBX500.
The signals relative to the following serial interface types are available on the CBX spring
clamp terminal blocks.
The main serial interface type and its parameters (baud rate, data bits, etc.) can be
defined by the user via VisiSet™ software. The RS485 half duplex is automatically set
whenever MUX32 communication protocol is enabled. For more details refer to the
"Communication" folder in the VisiSet™ Help On Line.
Details regarding the connections and use of the interfaces are given in the next paragraphs.
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 29 – RS232 Main Interface Connections Using Hardware Handshaking
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