User's Manual
Table Of Contents
G3S-800-140 Installation & Service Manual
044-05095 Rev. A 2-3 February 2001
2-5.1 Amplifier Module Status, Alarm, Control, And Power Connector
The amplifier has a separate remote alarm and control connector which may be used by the host
system to monitor and control the individual amplifier modules. The status, alarm, control, and
power connections on the amplifier connector are made through a 21-pin male D-Sub combo
connector (figure 2-2) and are listed and described in table 2-1.
A1
A2
A3
A4
1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17
Figure 2-2 DC and Logic Connector (on Rear of G3S-800-140 Amplifier Module)
Table 2-1 Amplifier Module DC and Logic Connector Definition
Pin Function Description
A1 Power Input +27 Vdc (Power Contact)
A2 Power Input +27 Vdc (Power Contact)
A3 Ground Ground (Power Contact)
A4 Ground Ground (Power Contact)
1 RS485 +TxD Serial Communication Data Out
2 RS485 +RxD Serial Communication Data In
3 Service Loop TTL input to Amp. Gnd. for special test mode (Note 1)
4 MCPA Disabled
(Summary Fault)
TTL signal normally low indicates MCPA enabled. A high level indi-
cates that the MCPA has been disabled. Over Power, Over Voltage
takes one second to activate the signal.
5 Mod Addr 0 TTL input to Amp. Gnd. supplied by shelf to identify slot.
6 Mod Addr 1 TTL input to Amp. Gnd. supplied by shelf to identify slot.
7 TP1 TTL output. Future test point.
8 Manual Download GND to download manually
9 DC on stat TTL output. High indicates Amp is powered on.
10 RS485 –TxD Serial Communication Data Out
11 RS485 –RxD Serial Communication Data In
12 SCL7 No connection
13 SDA7 No connection
14 FP Disable Output Output, GND if the front panel switch is in the OFF position; +5 volts
indicates the front panel switch is in the ON position.
15 FP RST Output, GND if the front panel switch is in the RESET position; +5 volts
otherwise.
16 GND Ground
17 Module Detect Ground potential. Informs the subrack that an MCPA is plugged in.
Note 1: Service loop grounded allows the MCPA to be enabled or disabled by the front panel
switch when not mounted in the shelf.