AR500 User’s Manual
LLL00xxxx – Rev 1.0
10
See Serial Interface Operation (section) for information on commands and
data. The maximum baud rate is 460.8 KBaud for RS232 and 921.6 KBaud for
RS485.
RS232
: RS232 is normally used for shorter distances of communications and
slower data rates. RS232 allows only one transmitter and one receiver per
network. A standard 9-pin D-SUB RS232 serial female connector can be built
to interface with an IBM or compatible computer using connection the pins
below.
Color
Pin on DSUB 9
connector
Function
Green
2
Transmit data from sensor
Yellow
3
Receive data to sensor
Gray
3
Signal ground reference
N /C
1, 4, 6
DCD, DTE, DCE
– These three signals
can be tied together to satisfy some PC
signal requirements for hardware
handshake.
N / C
7, 8
CTS, RTS
– These two signals can be
tied together to satisfy some PC signal
requirements for hardware handshake.
RS485:
RS485 is normally used for longer distances of communications and
faster data rates. Multiple devices can share one line because RS485 is multi-
drop. Unless your computer or controller or PLC supports RS485
communications, it may be necessary to use a commercial RS485 to RS232
converter.
4.4
Analog Output (Blue, Grey)
Your sensor is configured with either 4-20mA current loop or 0-10V voltage
analog output.
The Grey wire is the return signal for the Analog Output. It is connected to
ground inside the sensor and should not be connected to ground outside the
sensor. Inadvertently connecting it to ground may cause a reduction in
accuracy of the analog output. The analog signal for distance is a 4-20 mA
current loop or 0-10V signal.
In Current Loop / Voltage Blue wire delivers a current (or voltage for sensor
ordered with Voltage output) proportional to the measured distance. The
resolution is characterized by a 16-bit digital-to-analog converter.
