2000, 2001 Cirronet
Incorporated
3
M-2410-0007 Rev -
using an RJ-11 connector. If the sync signals are required, one of the master SEMs must
be designated as the sync master. See the section
SEM/Radio
Commands for details. If
there are no co-located master SEMs, sync should be left disabled.
The power connector is a 2-pin DIN type connector. The provided AC adapter provides a
9 volt power level to the SEM. The SEM can accept DC voltages ranging between 7VDC
and 26VDC if alternative power supplies are to be used.
Figure 2. SEM Front Panel Diagram
The Configuration Port is an RS-232 serial port that may be used to configure the SEM.
This is useful when the default IP address of the SEM cannot be used with the existing
network preventing configuration through a telnet session. See the section
Configuring
the SEM
for details of using this port.
SEM Status Indicators
The PWR indicator on the front panel indicates that power is applied to the SEM and that
the power switch is in the ON position.
TXD and RXD are indicators of data activity. They indicate the transmission and
reception of data over the Ethernet connection. Note that these LEDs can be active even
when the SEM is not communicating with another SEM.
On a slave SEM, the Link A LED indicates the SEM has established a connection with
the master SEM. When a slave SEM is powered on, it will take a few seconds for this
LED to turn on. On a master SEM the Link A LED is always on. The Link B LED is not
used.
Configuring the SEM
SEMs are shipped from the factory with default settings that include a default IP address
of 0.0.0.0 and a default configuration as a slave bridge. In order to set up a wireless link,
alternate IP addresses need to be assigned and one of the SEMs must be configured as a
master device. If a BOOTP or DHCP server is not present a different IP address must be
assigned to the SEM. If a DHCP server is present on the network, the IP address can be
set up through it. See the sections
BOOTP
and
DHCP
for details.
SEM 2410
2.4 GHz SPREAD SPECTRUM WIRELESS ETHERNET MODEM
Power Switch
Status Indicators
Configuration Port
