Specifications
14 209351 REV B Operations Manual, Redundant System Controllers
2.4.1 Control Cable Connector (J3) - MS3112E16-23S
The primary connection between the controller and the LNA/LNB (Low Noise Amplifier/
Low Noise Block Converter) switch plate or SSPA (Solid State Power Amplifier) switch
assembly is through J3. The connector is a 23-pin circular connector, type MS3112E16
-23S (See Figure 2-2 and Table 2-1). For external waveguide switches, a standard
100 ft. (30m) cable, L201061 should be used.
2.4.2 Serial Port, Main (J4) - DB9 (F)
The main serial port is for connection with any host computer. This port contains both
RS-232 and RS-485 communication in half duplex. For convenience a set of Form C
relay contacts are available at this port as a Service Request. The Service Request is
essentially a Summary Alarm for any system faults that occur. The baud rate and other
communication parameters are selectable via the front panel menu.
The pin-out is shown in Table 2-2. Note that the pin-out is standard DTE; a null modem
is not required when connecting to a standard PC serial port.
If required, a 120 ohm RS-485 termination resistor is provided at pin 9. It should be
connected to pin 4 to provide a 120 ohm termination on the RS-485 bus.
Figure 2-2: Rear
panel view of J3,
MS3112E16-23S.
Pin Function Pin Function
L
Power Supply #1 +13-17 VDC, 900mA
or +26V, 1.5A (-HP version only)
F Switch Common, +26 VDC, 5A max
J
Power Supply #2 +13-17 VDC, 900mA
or +26V, 1.5A (-HP version only)
H Switch Common, +26 VDC, 5A max
G
Power Supply #3 +13-17 VDC, 900mA
or +26V, 1.5A (-HP version only)
T Switch #2, Position 1 (Rx)
E Switch Common, +26 VDC, 5A max V Switch #2, Position 1 (Rx) (primary)
B AMP Support GND N Switch #2, Position 2 (Rx)
D Switch Common, +26 VDC, 5A max R Switch #2, Position 2 (Rx) (primary)
W Switch #1, Position 1 (Tx) (primary) A AMP Support GND
U Switch #1, Position 1 (Tx) C AMP Support GND
P Switch #1, Position 2 (Tx) K Switch Common, +26 VDC, 5A max
S Switch #1, Position 2 (Tx) (primary) M Switch Common, +26 VDC, 5A max
Table 2-1: J3 Switch Connector, MS3112E16-23S
Table 2-2: Main Serial Port (J4) Pin Out
Function Pin Notes
RS-485 TX+ 1
RS-232 Out or RS-485 TX- 2
RS-232 In or RS-485 RX- 3
RS-485 RX+ 4
Ground 5
Service Request 1 6 Closed on Fault
Service Request 2 8 Open on Fault
Service Request Common 7 Form C Common
Termination (120 Ohm) 9 Connect to pin 4 to terminate unit on end of bus