7.1.2.3 PC Control using RS485 and Paradise M&C Software

Applications requiring long cable runs between the computer and the 1:1 Redundant System may use RS485 communication. The Compact Outdoor Amplifier’s firmware supports networking on a RS485 bus. This type of network can be used to support the 1:1 Redundant System.

The RS485 link can typically be run up to 4000 ft. (1200 m) lengths. A good quality twisted pair cable should be used along with proper line terminations. There are no parallel end terminations in the amplifier’s RS485 interface. Any required cable terminations have to be added externally. Either full or half duplex RS485 communication is supported. Schematics showing the proper wiring of each version are shown in Figures 7-18 and 7-19.

As in the stand-alone redundant system of Section 7.1.2.1, each Compact Outdoor SSPA must be programmed for Redundant System operation by using the RS-232 interface and M&C program. Similarly when networking SSPAs on a RS485 network, each amplifier’s address must be set before they can communicate over the network. Both of these steps should be performed together as part of the initial system setup.

Figure 7-18 shows a typical 1:1 Redundant System with RS485 Full Duplex Communication. Figure 7-19 on the following page shows a typical 1:1 Redundant System with RS485 Half Duplex Communication.

SSPA 2

J3

OUTPUT SAMPLE

J4

MONITOR &

CONTROL

T E U F

TX +

TX -

RX +

RX -

SSPA 1

 

J4

 

MONITOR &

 

CONTROL

 

T E U

F

TX +

RX +

To RX of Computer

To TX of Computer

TX -

RX -

 

J5

 

 

J6

 

 

 

 

LINK

 

SWITCH

 

 

 

A

B

F

F

C

E

A2 (J6)

SWITCH

 

 

 

 

 

 

 

 

C

LINK

 

 

 

 

 

 

B

 

 

 

 

 

 

A

CABLE

 

 

 

 

 

 

 

 

 

 

 

SWITCH CABLE

F

 

 

 

 

 

 

 

 

 

 

 

 

 

 

E

 

 

 

 

 

 

 

D

B

A

F

F

C

E

A1 (J6)

 

 

J5

 

J6

 

 

 

 

 

LINK

 

SWITCH

 

 

 

 

 

 

 

 

 

J3

OUTPUT SAMPLE

1

RF OUTPUT

4 2

3

Figure 7-18: 1:1 Redundant System with RS485 Full Duplex Communication

Operations Manual, HPA2, Compact Outdoor SSPA

205486 REV F

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Paradise 205486 REV F manual PC Control using RS485 and Paradise M&C Software
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