ATL ATU Telex Unit Betriebs- und Installationshandbuch - Seite 8

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(v) Reset of Telex Unit

Check that the all LED's on the Telex Unit light within 5 seconds of

the mains power being connected or the RESET button being

pressed. Check that the host equipment is powered up. Send the

Reset Command (ASCII characters ESCAPE A) from the host

equipment to the Telex Unit and check that the RUN LED is still lit,

and the host LED's are extinguished.

Note that a Reset command is required on each occasion that the

Telex Unit is powered up or reset via the RESET button. If the LED's

do not light after 5 seconds on power up or pressing of the RESET

button, check the mains connection. If the RESET command does not

extinguish the Host LED's, check the host and its connection to the

Telex Unit. Check the baud rate is set correctly in the Telex Unit and

the method of security checking and flow control is correct (mode of

operation). See section 3 for details.

(vi) Check Message

After the HOST LED's have been extinguished the Telex Unit is ready

for use in accordance with the Telex operating instructions for the

host equipment. If possible a test telex should be sent to another

known location as a check that the system is operating correctly.

3. HOST SIDE CONNECTION DETAILS

RS232C Host connection

(a) 3-Wire

This uses only the connections Tx, Rx and Common as the interface

between the Host and the Telex Unit. For this mode of operation the

unit must be configured with XON/XOFF flow control and ENQ/ACK

data security.

(b) 5-Wire (XON)

This uses Tx, Rx, Common, DSR and DTR as the interface between the

Host and the Telex Unit. With this type of interface the DSR/DTR lines

are used for data security. XON/XOFF are used for flow control

As (b) but uses DSR/DTR for security and flow control.