Connector panel of the BDU
98-175666-C
Chapter 3: Interfaces
3-4
3.1.5 GPIO RJ-45 connector
The Tx mute function can be controlled with a simple switch connected between pin 1
(Tx mute) and pin 2 (12 VDC). The Rx lock function is high and becomes low when the
modem is not in Rx lock.
3.1.6 RS-232 RJ-45 connector
Use the following connector to connect the BDU to the VSAT modem
Outline on BDU Pin
I/O Signal
Pin function
1
I
GPIO1
Tx mute (active high)
2
O
12 VDC / 500 mA
Power output
3
O
GPIO2
Rx lock (open drain)
4
N/A GPIO3
Future use
5
GND
Ground
6
O
12 VDC / 500 mA
Power output
7
N/A GPIO4
Future use
8
GND
Ground
Shiel
d
PCB ground
PCB ground
Table 3-5: RJ-45 GPIO connector, outline and pin assignment
Outline
Pin
I/O
Signal
Function
1
I
RSSI 2
CM temp out of range
2
I
DTR/Rx Lock
CM power good
3
I
RXD
BUC TXD
4
-
GND
Ground
5
-
GND
-
6
O
TXD
BUC RXD
7
I
DSR/TX Mute
GMU reset
8
I
RSSI 1
CM RSSI
Shield -
PCB ground
PCB ground
Table 3-6: RJ-45 RS-232 connector, male, outline and pin assignment
