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2–

2.6Remote I/O Connection

Port A

Pin Description

1 N/C

2 N/C

3 Ground

4 Remote RF Power RAISE - Momentary to Gnd to raise power 20 watts/second

5 Cabinet Temperature - 0.01 Volts/degrees Celsius reading of internal cabinet temp.

6 Ground

7 Remote High Voltage ON/OFF - Hold to ground to turn ON High Voltage

8 Fault Summary - TTL Logic HIGH (+5 VDC) when any fault light is ON

9 Ground

10 N/C

11 N/C

12 N/C

13 N/C

14 N/C

15 Remote RF Power LOWER - Momentary to Gnd to lower power 20 watts/second

16 N/C

17 N/C

18 Remote RF Power, Forward - 1 VDC = 1000 Watts of Forward power

19 N/C

20 N/C

21 Remote RF Power, Reverse - 1 VDC = 1000 Watts of Reverse power

22 N/C

23 N/C

24 N/C

25 N/C

The DB-25 pin connections PA1-PA5 (on the back of the controller) are where the 

DB-25 Male-to-Male cables are attached from the individual PA2000's. Use PA1 for 

the top amplifier and PA2 for the bottom amplifier. 

The additional I/O connections on the back of the controller consist of 2 main ports; 

Port A (DB-25 Female) and Port C (DB-37 Female) . Port B (DB-37) is not used in 

the FM4000. 

Port A has the metering and control of the System and Port C has the individual 

amplifier metering channels available from each of the PA2000's. 

Other I/O ports are for the reflectometer (DB-9 Female) and an unused power control 

port (DB-9 Male). I/O port A is described in illustration 2-15 and I/O port B is 

described in illustration 2-16.

Illustration 2-15 Remote I/O Port A Female DB-25

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Crown FMX250 Manual do Utilizador Página 18