Hanna Instruments HI 504910 - Manual (Page 27)

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SELFTEST PROCEDURES
The selftest procedure can be made only entering the setup
menu and selecting one of the items of the “tESt” group (t.00
- t.03).
Note All the tests are made while in setup mode, where a time-out
is present. If no action is performed for about 5 minutes, the
mode is automatically exited and the instruments returns to
previous mode.
DISPLAY TEST
The display selftest procedure consists of lighting up all the
display segments together.
• To start the procedure select setup
item t.00 and an “OFF” blink-
ing message will appear on the
primary LCD.
• Press the æ (or ) key once and
the message will switch to a blink-
ing “GO”.
• Press CFM key to confirm or the
æ (or ) key again to return to
the previous status.
• If confirmation is given when the
“OFF” message is blinking, no
action is performed and it will move
to the next setup item (t.02).
• The display test is announced by a scrolling “Display test”
message.
• All the segments light up for a
few seconds and then switch off
before exiting the display test pro-
cedure and moving to the next
setup item (t.02).
When making a call, after the data connection is established,
the “NNPWD...” command (where “NN” is the address of
the device controlling the modem, i.e. the one with O.31 set
to “On”) must be issued by the remote computer within 15
seconds. When the data connection is up, the RS485 protocol
for a remote connection is all the same as for a local network
(see the previous section). An automatic disconnection takes
place if no character is received in the RS485 network in 3-4
minutes.
Note When confirming the “CELL” option for setup item P.00, if the
LCD shows a blinking “WRONG” verify if:
- the SIM card is correctly inserted;
- the PIN number is correct;
- the signal coverage is good.