RFL Communications 21 Sub-MUX Manual de usuario descargar pdf (Pagina 6)

RFL SMX3/40 Page 6 of 24 Issue 2.02

User Manual

07 May 2009

7. X21 port

The X21 port is a DB15 male connector; this is connected internally to a header on

the PCB using a ribbon cable. The X21 port may be configured as DTE or DCE by

fitting the ribbon cable to the appropriate X21 Port Header, and by selecting settings

on DIP switch 5. Note: DTE is the standard configuration, and is used in all

applications where the network provides the signal timing.

Transceivers are specified to ± 15kV IEC1000-4-2 air discharge ESD protection and

port connections are additionally protected by Tranzorb type arrays.

This port carries an aggregate of four bi-directional data channels, channels 0 to 2

sampling at 16kbits/s and channel 3 at 8kbits/s on a 64kbits/s service. A bi-

directional control signal is also provided for each data channel.

Standard X21 Port Pin-out (when in DTE configuration) – D15M

Circuit Pin A Pin B Direction Notes

T Transmit Data 2 9 Output

R Receive Data 4 11 Input

C Control 3 10 Output Permanently on

I Indication 5 12 Input Signal ignored

Signal Element

Timing

6 13 Input Timing signal received

from network

G Ground 8 15

X Signal Element

Timing

7 14 Output Timing signal transmitted to

network (X). Special applications

only. Requires to be enabled

using mode DTE + Timing X

enabled

Screen / Drain

Must be earthed to shell

X21 (DTE)

X21 (DCE)

V24 V24

X21 header locations

Headers connected

to X21 Port

Standard header location

DCE header location only

used when SMX3/40

provides signal timing

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

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RFL Communications 21 Sub-MUX Manual de usuario Pagina 6

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