Star Microwave SM Cirius LM, User Manual, Page: 12 / 79

Cirius LM User Manual 2016 Page 12
Pin # Signal Name Direction Signal Description
1
NC No connection
2 TXD Out Transmit Data (from IDU)
3
RXD In Receive Data (to IDU)
4 NC No connection
5 GND N/A Ground
6 NC No connection
7 NC No connection
8 NC No connection
9 NC No connection
Table 5 CLI Connector Pinout
1.2.5. Front Panel LEDs
Green Power LED : Indicates DC power is applied.
Yellow Alarm LED
: Indicates loss of IDU-ODU command/telemetry link. This alarm
is also accompanied by the closing of Relay 1 (accessible via the Overhead/Alarm
Interface discussed in Section 1.2.3).
Red Fault LED : Indicates loss of lock in demodulator. This alarm is also
accompanied by the closing of Relay 2 (accessible via the Overhead/Alarm
Interface discussed in Section 1.2.3).
1.2.6. DC Power
DC Power is provided to the terminal (IDU and ODU) via a three terminal
connector. The IDU accommodates -21 to -60 VDC. (Positive polarity versions are
available. Contact factory for more information.) For proper operation, connect DC
power interface to external power supply as follows:
•
Connect negative terminal of external supply to “-V” terminal
•
Connect positive terminal of external supply to “+V” terminal
•
Connect positive terminal of external supply to “GND” terminal
Two fuses are accessible from the front panel. One fuse (labeled “+V” in Figure 3)
provides short circuit protection when the IDU is configured for positive voltage
operation; the second fuse (“-V”) provides short circuit protection when configured
for negative voltage operation. In both cases, the fuse protects both the IDU and
the ODU. The fuse holders accommodate standard 5 x 20 mm fuses. The IDU
units are delivered with 7A fast-acting fuses installed.