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Transferring text to displays
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For use with Global Positioning System (GPS)
With two SATELLINE-1AS/-2AS radio data modems it is easy to make up point to point
connections. The power level of the transmitter is 0,5 W. It is possible to reach distances
from 2 to 30 km depending on topographical conditions and antenna locations. On
special request it is possible to manfacture transmitters with the maximum output power of
1,0 W. Country specific laws of radio communication must always be followed.
The radio data modem operates well in data networks where the same channel is used by
several mobile terminals. In such systems the protocol can be either polling mode, in which
the data communication is controlled through one of the radio modems or multimaster
mode, in which any one of the radio modems can initiate the data transmission when the
radio channel is free.
When the radio data modem is in the receiving mode, a data squelch facility is
incorporated into the modem board to effectively ignore reception of error characters to
the RD line which may have been caused by radio interference.
1.2
RS232 Pin Connections
Supply Voltage positive pole
-
VB
15
14
Request to Send
IN
RTS
13
-
-
-
12
Transmit Data
IN
TD
11
Data Set Ready
OUT
DSR
10
Receive Data
OUT
RD
9
Ground
-
GND
8
Signal Ground
-
SGND
7
Clear to send
OUT
CTS
6
Receiving signal strength indicator
OUT
RSSI
5
LED on switching
-
LED ON
4
LED on switching
-
LED ON
3
Carrier Detect
OUT
CD
2
Data Terminal Ready
IN
DTR
1
Operation
SD
*)
Line
D-connector Pin
SD = Signal direction from radio data modem
IN = Input
OUT= Output
SATELLINE-1AS and SATELLINE-2AS
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