User Guide

reset when the expiration date is changed. If the expiration

date is reached without any updating of the items P.07 - P.09,

then the “Cellular error” will be switched on and no more

messages will be sent by the instrument until the error is

disactivated.

To disactivate this error it is necessary to update the SIM expi-

ration date.

If the user has unlimited credit on the SIM card, the item P.04

has to be set to “222”, which is interpreted by the instrument

as unlimited number of SMSs that can be sent. In this case

the value of remaining messages will not be decremented

and no check will be performed on the SIM card expiration

date. Moreover, at the beginning of each SMS it will not be

present the remaining-messages information (“Rem_msg:

xxx”).

Note It is possible to ask information (about the current pH, ORP

and temperature readings and active errors) to the HI 504

also from a cellular phone different from the one(s) selected

through the item P.02 (and P.03). This is accomplished by

sending to the instrument the SMS “+Pxx”, where “xx” indi-

cates the ID of the HI 504 (setup item G.11).

The instrument will recognize the command and reply send-

ing the requested information.

Note If a communication problem occurs during the normal func-

tioning of the instrument, the “Cellular error” will be switched

on and no SMS can be submitted until this error will be

disactivated (when this error occurs, the instrument will try

repeatedly to initialize the cellular engine and the error will

be disactivated only after a successful initialization, or if the

SMS service is disabled by setting item P.00 to “PC”).

Note All the settings of the SMS group in the Setup menu are the

same for both pH and ORP configuration.