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P300H P300 Series Modem Installation and Operating Handbook Page 180
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:
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 11155149123 512 and
18 1
Master-A (to product `-`) 9 13 / (15) 2 / (3) 1 1 1 2 / (7) 1 9 / (5) 7 11 5
11 11
Master-B (to product `+`) 3 14 / (16) 9 / (10) 6 6 9 3 / (5) 9 2 / (8) 3 10 9
11 11
Slave-A (from product `-`) 6 15 / (13) 3 / (2) 2 2 2 7 / (2) 2 5 / (9) 8 9 3
211 11
Slave-B (from product `+`) 4 16 / (14) 10 / (9) 7 7 10 5 / (3) 10 8 / (2) 2 8 7
211 11
Conn' Ref' A P / (Q) R / (S) D E F G / (H) I J / (K) L N T
311 11
Notes
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 pin / (remote end pin)”, and the cable must be made accordingly taking into account which end
1
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
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. If
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)”.