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Connection to TETRA Radio
To connect the RTU (via onboard serial or plug-in port) to a TETRA radio, use an RS232-E+
type adaptor which ends with the male 9-pin, D-type connector. The port should be defined as
RS232, Async, PPP, Tetra, MDLC over IP.
RS232 Function
TX-DATA
RX-DATA
CTS
GND
CD (Rec line)
RTS
DTR
Connection to MotoTrbo Radio
To connect the RTU (via Host USB port) to a MotoTrbo radio, use a cable FKN8644A. The
port should be defined as USB Host, Async, Remote NDIS Host, MotoTrbo.
Function
+5 VDC/
VBUS+
Data -
Data +
GND
Ignition
RTU-to-RTU Connection Using MDLC Protocol through RS232
To establish a link between two RTUs using MDLC protocol, the ports of both RTUs should
be defined as RS232 RTU-to-RTU (RS-Link). The ports of the two RTUs should be connected
by the FLN6457B and FLN6458B adaptors, when the adaptors are connected.
8-pin Connector(on
RTU)
1 →
2 ←
3 ←
4
5 ←
6 →
7
8 →
USB Type A
(on RTU)
1 →
2 ↔
3 ↔
4
Appendix C: Accessories, Adaptors and Cables
9-pin Male
3
2
8
5
1
4
Not used
7
26-pin Female
Direction
(on Radio)
3
from RTU
2
to/from
RTU
1
to/from
RTU
4
-
25
from radio
power cable
C-6
Direction
from RTU
to RTU
to RTU
-
to RTU
from RTU
from RTU
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