Xylem H-2192 - Manual (Page 17)

Chapter 3
Operation
3.1 Overview
The H-219X is easy to set up and operate, and can be used as a regular data modem as well as a
voice modem. The modem uses the standard AT and S register commands, however in most
cases they are handled automatically so the user does not need to know anything about them.
Options related to the voice mode of the H-219X are programmed using a built in menu or from
an extended set of commands.
3.2 Data Mode Operation Over Standard Phone System
The main purpose of the H-2191 in the data mode is to allow data communications between a PC
and a remote W
ATER LOG series data logger. This allows for remote data transfers, and for ®
changes to the data logger setups remotely. If the H-219-1 is operated with a W
ATER LOG series ®
data logger, all that needs to be done is to connect the power, the RS-232 cable, and the phone
line to the H-2191.
Although this may seem too simple, the system is designed to be a plug and play system,
meaning that only a few steps are necessary for operation. If you are going to use the modem
with something other than a W
ATER LOG series data logger, standard AT commands and S ®
registers may be changed for special modes if needed. In most cases no changes are needed.
When used in the data mode only, no setup changes are required on the data logger. This is the
simplest mode of operation.
Note: The H-2191 is configured to always answer in the voice mode. When the H-2191 is
called it first looks for a keyed response from a touch-tone phone in order to continue
with the menu for voice capability. If it does not receive a keyed response within five
seconds, the H-2191 will automatically switch to the data mode and expect to
communicate with another modem in a data mode.
3.3 Voice Call In Over Standard Phone System
Before proceeding, an explanation of how and what data will be sent from the data logger to the
H-2191 modem may be helpful.
3.3.1 Voice Call In Overview
When a incoming call is made to get data from a site in a voice mode, the data spoken is data that
resides in the modem, not the logger. On the XL series of loggers, there is a special menu option
to define what data will be sent to the modem and the order in which it will be sent. This data is
H-219X
Operation 3-1