Reliable Communications; Cellular Modem Scheduling - Hach 900 MAX Instrument Manual

Section 6

6.2.2.2 Reliable Communications

6.2.2.3 Cellular Modem Scheduling

Note: If the Cellular Modem
Scheduling is disabled and the
sampler is connected to a cell
phone rather than a land line, the
sampler will not be able to answer
any incoming calls.
Note: If Modem Power is disabled,
the Cellular Modem Scheduling
prompt will not appear.
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Modem
4. Loosen the four screws on the cover of the cell phone enclosure and
remove the cover, to view the signal strength. The signal strength is
indicated by the number of dashes across the bottom of the cell phone
display. The more dashes the greater the signal.
In order to ensure reliable communications between the sampler and the host
computer, it is absolutely essential that the host computer is equipped with a
Cellular Compatible modem. The modem on the host computer must support
the "MNP.10ED" protocol. Computers equipped with modems that do not
support this protocol may be able to connect to the sampler but will not be
able to maintain reliable connections.
With Cellular Modem Scheduling enabled, both the modem and cell phone
power will simultaneously be turned off and on at user defined intervals to
conserve battery power. If Cellular Modem Scheduling is disabled the sampler
will assume that a land line is available and that the cell phone is not
connected to the sampler. With Cellular Modem Scheduling disabled (and the
sampler on battery power) the sampler will leave the modem turned off until a
call is received on the land line.
If the sampler is on ac power or the battery voltage is over 14.5 volts, the
power to both the cell phone and modem will constantly be on regardless of
whether Cellular Modem Scheduling is enabled or not.
If the sampler is configured to call a pager for alarms and the alarm condition
is met, the sampler will still call the pager even if modem scheduling is
disabled. In this situation the cell phone and modem will temporally be
powered back up again to allow the sampler to call the pager and transmit the
alarm code. However, as soon as the alarm code is transmitted, the power to
the cell phone and modem will again be turned off.
1. To enable Cellular Modem Scheduling, Modem Power must be enabled.
2. Enable the Cellular Modem Scheduling using the
11:00 AM 21 - APR - 01
ACCEPT CELLULAR MODEM
SCHEDULING:
CANCEL
CHOICES: ENABLED, DISABLED
3. Press to continue.
ACCEPT
CHANGE CHOICE
ENABLED
key.
MODEM SETUP
CHANGE
CHOICE
8990cm.fm