CBX800 INSTALLATION MANUAL
16
Host RS232 Interface
The RS232 interface can be used for connections to the host computer allowing transmission of code data.
The following pins are used for RS232 interface connection:
Pinout
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
CBX800
Figure 15
– RS232 Host 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 16 - RS232 Control Signals
If the RTS/CTS handshaking protocol is enabled, the reading device activates the RTS output to indicate a
message is to be transmitted. The receiving unit activates the CTS input to enable the transmission.
