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Vanguard Multiport 4520CP Controller User’s Guide A-3
Serial Connector Pinouts
6 DSR 107 Input
7 Signal GND – None
8 DCD 109 Input
15 TxC
in
114 Input
17 RxC
in
115 Input
20 DTR 108/2 Output
24 TxC
out
113 Output
Pin Signal Descriptions
Signal Description
Chassis
GND
Chassis (Earth) Ground. Prevents static discharge.
TXD Transmit Data. Sends data to peripheral device.
RXD Receive Data. Receives data from the peripheral.
RTS Request to Send. Signal asking if peripheral device is
ready to receive data.
CTS Clear to Send. Signal from the peripheral device indicating
readiness to accept data.
DSR Data Set Ready. Signal from the peripheral indicating its
status.
Signal
GND
Signal Ground. Provides reference level for other signals.
DCD Data Carrier Detect. Signal indicating that the peripheral
device has detected a signal from the remote peripheral
device over the telecommunications channel.
RxC
in
Receive Data Clock. Input for receiver signal element tim-
ing from a synchronous, DCE device.
TxC
in
Transmit Data Clock. Input for transmitter signal element
timing from a synchronous, DCE device.
Serial Connector Pinout
Pin Number
RS-232
Signal
V. 2 4
Signal Direction