beautypg.com

Paradise P300 User Manual

Page 183

background image

P300H

P300 Series Modem Installation and Operating Handbook

Page 183

ASYNC ESC CONNECTOR

This connector carries:

An RS232/RS422/RS485 async port for use on either the ESC or Aux channels
An RS232 serial port for log printing & embedded M&C update
An RS422 Station Clock input
The Receive constellation monitor points (if the Monitor/AGC option is fitted)

ASYNC ESC CONNECTOR

RS232

RS422/

Async port for ESC or Aux channel

RS485

2

2 (a)

Async ESC/Aux Input (to satellite)

-

9 (b)

Async ESC/Aux Input (to satellite)

3

3 (a)

Async ESC/Aux Output (from satellite)

-

10 (b)

Async ESC/Aux Output (from satellite)

1

1

Ground

RS232

Serial port for Log printing or embedded M&C update

12

Serial Input (RS232 port)

5

Serial Output (RS232 port)

13

Ground

Analog

Rx constellation monitor (Rx signal quality)

14

Rx I channel eye

7

Rx Q channel eye

15

Rx symbol clock

13

Ground

RS422

Differential Station Clock Input

4

Station Clock (a)

11

Station Clock (b)

13

Ground

RX CONSTELLATION MONITOR PORT.
If the Monitor/AGC option is fitted it is possible to view a receive constellation (but not the more traditional
`eye pattern`). To display the receive constellation on an oscilloscope, connect the I and Q signals to the
main X/Y inputs, and apply the receive symbol clock to the external trigger input of the 'scope. The main
'scope inputs should be set to X/Y display, AC coupled, both channels on 200 mV/div, with the trigger from
the external trigger input. See `STANDARD LEAD` on the following page.

DIFFERENTIAL STATION CLOCK
This provides a RS422 compatible station clock in addition to the unbalanced 75

S

station clock BNC

connector. See the menu dialogue in section 6.7.4 on page 89 For a full description of this port.