Westermo RM-80 - Manual (Page 12)

12 6193-4201
2.3 Power Supply
The RM-80 module can be powered from a 10 – 30VDC power supply. The power sup-
ply should be rated at 1 Amp.The nnegative side of the supply should be connected to a
good “ground” point for surge protection. The supply negative is connected to the unit
case internally.
The positive side of the supply must not
be connected to earth. The DC sup-
ply may be a floating supply or negatively
grounded. The power requirements of the
RM-80 unit is 280mA @ 12V or 150mA
@ 24VDC. This is inclusive of radio and
Ethernet ports active, & serial port plugged
in. Transmission current (500mW RF) is nominally 500mA at 12V, 250mA at 24VDC.
2.4 Serial Connections
2.4.1 RS-232 Serial Port
The serial port is a 9 pin DB9 female and provides for connection to a host device
as well as a PC terminal for configuration, field testing and for factory testing.
Coomunication is via standard
RS-232. The RM-80 is config-
ured as DCE equipment with
the pinouts detailed below.
Hardware handshaking using
the CTS/RTS lines is provided.
The CTS/RTS lines may be
used to reflect the status of
the local unit’s input buffer, or
may be configured to reflect
the status of CTS/RTS lines at
the remote site. The RM-80 does not support XON/XOFF.
Example cable drawings for connection to a DTE host (a PC) or another DCE hosts (or
modem) are detailed above.
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