RFL Communications 21 Sub-MUX Uživatelský manuál stáhnout pdf (Strana 22)

RFL SMX3/40 Page 22 of 24 Issue 2.02

User Manual

07 May 2009

Example 5: Data Channel Concatenation

In this example, data on a single channel only is transferred from end to end, across

unsynchronised X21 links.

Set Aggregate Direction for all units to X21 port. Transmit and Receive data is

presented at all ports. Only possible on a well disciplined system where only on

terminal transmits at once. This configuration allows both X21 links to run

unsynchronised.

Each link runs at its own clock speed. The data is transferred from B1 to B2 at V24

level by effectively being re-transmitted from the SCADA equipment.

DIP Switch Settings for all units

8 7 6 5 4 3 2 1

SW1 * * * * * * * *

SW2 0 1 0 0 1 0 0 1

SW3 * * * * * * * *

SW4 * * * * * * * *

SW5 0 0 0 0 0 0 0 1

SW6 0 0 0 0 * * 1 *

* indicates setting not applicable to this setup

If a Westica radio is to be used, these are configured as detailed in Section 7.6

Figure 7-1 of the Westica manual. Radio 1 is configured as Int Master (DCE), Radio

2 at C1 end is configured as Slave (DCE).

The Interconnection cable at each end is straight X21, as Cable Y in Example 3.

Substation A Substation B Substation C

X21

Radio or other link

–

may be unsynchronised

C1 B2B1A2

V24

Port 2

V24

Port 2

V24

Port 2

V24

Port 2

Aggregate channels: V24 port 2 on each unit is allocated to channel B, baud rate 2400

Example installation – SCADA network

SCADA Equipment

1 2 ... 17 18 19 20 21 22 23 24

Žádné komentáře

RFL Communications 21 Sub-MUX Uživatelský manuál Strana 22