User`s guide

Two Wire Simplex Interface
The radio modem can be used in a very basic two wire simplex connection. In this
example, with no wake-up signal provided by DTR the Radio Modem is required to be
permanently powered up. This is achieved by setting DTR control to off in the Radio
Modem configurator. The Radio Modem configuration to achieve this basic interface is
as followings:
baud <up to 115200>
flow none (or sw)
dtr off
2
3
4
5
7
8
2
3
4
5
7
8
Transmit Data
Signal Ground
PC Serial Port
DTE D9
Radio Modem
DCE D9F
2
3
4
5
7
8
2
3
4
5
7
8
Receive Data
Signal Ground
PC Serial Port
DTE D9
Radio Modem
DCE D9F
Data
flow
via
radio
link
Two wire simplex connection to the radio modem.
Three Wire Half Duplex Interface
The radio modem can be used for a basic three wire half duplex serial link employing
either software handshake or no handshake at all. The serial link into the radio modem
is operating as a full duplex link, however the radio transfer is a half duplex link. In this
example, with no wake-up signal provided by DTR, so the Radio Modem is required to
be permanently powered. The radio modem configuration to achieve this is as follows:
baud <up to 115200>
flow none (or sw)
dtr off
2
3
4
5
7
8
2
3
4
5
7
8
Receive Data
Transmit Data
Signal Ground
PC Serial Port
DTE D9
Radio Modem
DCE D9F
2
3
4
5
7
8
2
3
4
5
7
8
Receive Data
Transmit data
Signal Ground
PC Serial Port
DTE D9
Radio Modem
DCE D9F
Three wire half duplex connection to the radio modem
User’s Guide Connecting the Radio Modem 5-3