Paradise P300 Interconnecting Devices Using RS485, P200 / P230 / P230DI P1300 / P1301

Interconnecting Devices Using RS485

This page summarises the RS485 M&C ports of many different equipments from multiple vendors and explains how to interconnect them all for M&C operation. Connect any of the following devices in parallel on a daisy chain cable for multi-device operation:

Notes

Product:

Paradise

Paradise

Paradise

Paradise

Paradise

Codan

Anancom

Gilat

Signal

P300 / P400

P300

P500

P200 / P230 / P230DI

P1300 / P1301

C57/5900

AnaSat-C

SkyWay

Port Name:

Remote

ESC/Aux/

Async

RS485

RS485

RS485/

ESC Async

Rem

Async 2 on

Monitor/

M & C

Maint

M&C

Back' Alm

ESC

In

Out

RS232

Cont

P1361

Control

Connector:

9 pin `D`

50 pin `D`

15 pin `D`

9 pin `D`

9 pin `D`

15 pin `D`

9 pin `D`

15 pin

9 pin `D`

9 pin `D`

18p Circ'

9 pin `D`

(on cable)

Male

Male

Male

Male

Female

Male

Male

`D` Male

Male

Male

Female

Male

Shield

1

1

1

5

5

14

9

12

3

5

12 and 18

1

Master-A (to product `-`)

9

131

/ (15)

21 / (3)

1

1

1

21

/ (7)

1

91

/ (5)

7

11

5

Master-B (to product `+`)

3

141

/ (16)

91 / (10)

6

6

9

31

/ (5)

9

21

/ (8)

3

10

9

Slave-A2(from product `-`)

6

151

/ (13)

31 / (2)

2

2

2

71

/ (2)

2

51

/ (9)

8

9

3

Slave-B2(from product `+`)

4

161

/ (14)

101 / (9)

7

7

10

51

/ (3)

10

81

/ (2)

2

8

7

3

A

1

P / (Q)

1

R / (S)

D

E

F

1

I

1

J / (K)

L

N

T

Conn' Ref'

G / (H)

9

1: For all Async ESC channels carrying M&C data (for distant end M&C via the satellite) the cabling depends on which end of each separate M&C link the device is. Devices routing M&C data to the satellite are considered to be at the Local end of the M&C link, and devices bringing M&C into a site from the satellite are considered the Remote end of the link. For example at a Hub co-located with the system M&C computer every device would be considered the `Local end` of any M&C links via satellite. However at a node the device providing the incoming M&C link from the satellite would be considered the `Remote end` of the link, but any additional devices taking the M&C back to the satellite on a second hop to a more distant station would be the `Local end` again (local because they are the end of that specific link nearest the M&C computer). Pin numbers for Async ESC ports in the table above are shown as: “local end pin1 / (remote end pin)”, and the cable must be made accordingly taking into account which end of each M&C link the particular ESC connector is. For user convenience the P300 & P400 can provide an internal link from the M&C port to ESC port, avoiding having to cable M&C to both the M&C connector and then the ESC connector (if distant end control via satellite is to be used). When using this internal link you set the ESC interface to `Link to M&C` on the modem, and specify whether it is `Local end` or `Remote end` and the device internally routes it correctly (without any pin number changes on the Remote M&C port).

2. For reliable operation ensure that when no slave devices are talking the Slave-B line floats at least 200-300mV higher than the Slave-A line. If necessary provide 1k, 470				, or even 220 pullups (Slave-B
S	S	S	S	S	S

to RS232/485 converter DC+) and pulldowns (Slave-A to Gnd) to ensure lines float as specified. This ensures idle state of slave lines when not driven is a `mark` as an idle state of `space` will cause the first and possibly subsequent characters of slave responses to be lost. Due to the low speeds & short cables it is not normally required to terminate RS485 async M&C cables. If it does prove necessary use 120 between Master-A and Master-B at the end of the cable (furthest from bus controller). Between Slave-A and Slave-B try 470 first farthest away from the controller, then add 470 at the controller end too.SIf necessary reduce both to 240 or even 120 .

3. Conn' Ref' is used for specifying cables. For example a cable to connect a P300 at the distant end of a link with a Codan C5700 transceiver could be specified as: “A + 500cm + L” (ie connector `A`, 5 metres of cable, then connector `L`). The 10 connector `local RS485 bus` daisy-chain cable used in a 1:N switch to connect a backup P300, the P500 `RS485 Out` port, and a further 8 P300's could be specified as: “A + 50cm + E + 8 x (30cm + A)”.

P300H P300 Series Modem Installation and Operating Handbook Page 180