RFL Communications 21 Sub-MUX Manual de usuario descargar pdf (Pagina 7)

RFL SMX3/40 Page 7 of 24 Issue 2.02

User Manual

07 May 2009

Optional X21 Port Pin-out (when in DCE configuration) – D15M

Circuit Pin A Pin B Direction Notes

T Transmit Data 2 9 Input

R Receive Data 4 11 Output

C Control 3 10 Input Signal ignored

I Indication 5 12 Output Permanently on

S Signal Element

Timing

6 13 Output Timing signal transmitted

to network

G Ground 8 15

Screen / Drain

Must be earthed to shell

In either configuration, use 6 pair plus ground stranded cable with overall shield

(eg RS 111-8994).

Maximum recommended length in substations - 5m

Absolute maximum length - 10m.

The DCE configuration is used when the X21 link requires to be synchronised to the

network master clock signal that has been received from a co-located SMX3/40, or to

itself as master where network timing is unavailable. The timing signal is output on

pins 6 and 13.

DIP switches provide configuration options, see section 10.

1 2 3 4 5 6 7 8 9 10 11 12 ... 23 24

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RFL Communications 21 Sub-MUX Manual de usuario Pagina 7