Ericsson ZAT 19.2 Operation Manual page 30

2.11
Troubleshooting
2.11.1. The modem is dead!
+ You entered ATgatenl|.
It gives neither AT command nor OK on next line.
Check that the leads and cables are correctly connected.
Check the power supply (does the PWR (Test) indicator
lights?)
The modem has been used/tested by other persons and reset
such it gives neither echo nor reply.
When the modem was dispatched from the manufacturer, it
was set such as to give both echo and reply in full text. The
trick here is to reset the modem exactly as it was when you
took delivery.
The modem should now reply OK. If not, repeat this command a
couple of times just to be sure, before commencing with the
following controls.
The terminal/communication program may be incorrectly set
and is not online with the modem. (For example, the modem
may be connected to port 2, but you have defined port 1 in the
program). Check this.
There are so many different types of terminals that it is impossible to
give a comprehensive summary of all factors to be controlled in every
single case. There remains just one thing to do: study the users
guide carefully for advice on possible erroneous program settings.
"You will discover that there is a setting designated
«echo» (this is often referred to as «half duplex»). By
Setting this to the ON position, you obtain a
«confirmation» of your AT commands on the screen.
However, this is not an echo from the modem. When
everything is in order and the apparatus is set to echo,
the modem will reply with «AATT» followed by OK.
2-12
LZTR104006 R1.00
Zat 14.4/14.4-7 and Zat 19.2/19.2-7