PRODUCT INFO
25.04.2000
SATEL Oy, P.O.Box 142, FIN-24101 Salo, Finland
Street: Meriniitynkatu 17, FIN-24100 Salo, Finland
Tel: +358 2 777 7800, Fax: +358 2 777 7810, E-mail:
www.satel.fi
SATELLINE RADIO MODEMS
SATELLINE-3AS(d)
SERIAL PORT SETTINGS
SATELLINE-3AS(d) radio modem consists of two serial ports. Port1 is always RS-232. Port2 can be set
by hardware to be either RS-232 or RS-422/485. Details of changing the hardware settings of port2
are enclosed. The selection between RS-422 and RS-485 is made by external wiring. More
information of these differential interfaces can be found in the Satelline-3AS user's guide.
When Port1 is set active, Port2 is non-active and vice versa. So the both ports can not be used
simultaneously.
The both serial ports are wired to the same 15-pin D-sub connector. Pins 2, 3, 4 and 5 are
multifunctional. The following table shows the functions of the pins for different settings.
SERIAL PORT SETUP /
SERIAL PORT SETUP /
SERIAL PORT SETUP /
SERIAL PORT SETUP / Configuration of
Configuration of
Configuration of
Configuration of
Related Pins
Related Pins
Related Pins
Related Pins
Port 1
Port 1
Port 1
Port 1
Port 2
Port 2
Port 2
Port 2
ON / RS-232
OFF / RS-232
OFF / RS-232
ON / RS-232
ON / RS-232
OFF / RS-422,485
OFF / RS-232
ON / RS-422,485
Pin 2
CD
Carrier Detect
CD
Carrier Detect
-
RD+
Receive Data+
Pin 3
-
RD
Receive Data
-
RD-
Receive Data-
Pin 4
-
TD
Transmit Data
-
TD+
Transmit Data+
Pin 5
RSSI
RSSI
-
TD-
Transmit Data-
Pin 9
RD
Receive Data
-
RD
Receive Data
-
Pin 11
TD
Transmit Data
-
TD
Transmit Data
-
CD = Carrier Detect [Indicates a signal on the radio channel exceeding the level of sensitivity of the
modem
(also interference signal)
RSSI = Receiving signal strength indicator (Analog signal following the strength of the received signal)
• Instructions for changing the setting of the serial port2 from RS-232 to RS-422/485 (or vice versa)
The current setting of the Port2 can be checked in the setup mode. If the setting (written in the square
brackets after the list of the other settings of the port2) is not the one needed, the following hardware
and software modifications are required.
Open the back cover of the Satelline-3AS carefully keeping simultaneously the antenna connector
at its place.
Open the hex screws of the D-connector
Lift carefully the D-connector end of the circuit boards until you have access to the small 10 dip
switch matrix on the modem PCB.
Caution
! 3ASd will require some special care, to avoid a risk of
braking the display module. The metal fixing part of the display at the antenna side has to be
loosened slightly before lifting the PCBs.
Move the switches to the correct positions. Refer to the table below.
