User Manual

G3S-800-140-031 Installation & Service Manual

044-05095 Rev. A 2-4 September 2001

2-6.1 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 2-3.

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-800-140-031 Amplifier Module)

Table 2-3 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 indicates

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 in-

dicates 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.