RSDetection
User’s Manual
March 2016
S131-200-UM Rev A
Page 8
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1.3.1
Serial COM3
Dedicated RS-232
A 10-pin circular connector contains a dedicated serial port. This port is always
present and is identified as COM3 in the unit and in the configuration utility. The
default configuration for this port is 9600 BAUD, 8 bits, No Parity, and no
handshaking.
If this port is not used, the cap that ships with the unit must be placed over the
connector to provide protection from humidity and precipitation.
The optional cable, part number RS-S131-200-232, is used to communicate to a
standard DB-9 device, such as a PC. This cable has a weatherproof connector
on one end, but the other end is not weatherproof. The customer must
weatherproof this connector via a NEMA box or other enclosure.
For customer systems that were wired for the RS-S131 units, a serial adapter
cable can be purchased to transition from the 10-pin connector to the older
connectors used on the RS-S131. The part number is RS-S131-200-232-AD.
USB-B Direct to a PC
The USBB connector is square. The USBA connector is rectangular. This USB
connection is designed for direct connection with the PC using a standard USBB
to USBA cable. Similar to the dedicated RS-232 port, it is always present and
has the device name of COM2.
The unit ships with an RS-S131-200-USBB cable. This cable has a weatherproof
connector on one end, but the other end is not weatherproof. The customer
must weatherproof this connector via a NEMA box or other enclosure.
When the USB cable is plugged into a PC the PC will recognize the unit as a
serial port and create a virtual serial port in the PC. The name of this port will
vary depending on the PC, so it is important to know which port was added as a
result of connecting the unit.
Once the port name is known, the port can be opened and commands can be
sent to the unit. This connection serves as a convenient alternative connection
for configuration and data collection since it does not require a router or
network. The default configuration for this port is 460800 Baud, 8 bits, No
Parity, and no handshaking.
