ATL Telecom Telex - Manual (Page 8)

(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
(c) 5-Wire DTR
As (b) but uses DSR/DTR for security and flow control.
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