10.2
SEL-734 Meter Instruction Manual Date Code 20090730
Communications
Communications Options
The SEL-734 internal modem is globally compliant and allows direct
connection to the Public Switched Telephone Network (PSTN). The modem
includes support for CCITT V.92, V.90, V.34, V.32bis, V.32, V.22bis, V.22,
V.23, V.21 Bell 212A, and Bell 103 protocols.
The Modem Initialization AT String comes preset from the factory with the
default string
ATSTRING := ATHX0E0&D0SO = 1&K3. You may change the
modem configuration by changing the AT String setting. Figure 10.1 shows
the AT String expanded to better demonstrate the individual commands that
make up the factory default string.
Figure 10.1 Factory Default AT String
Modem Command Set
In general, the SEL-734 modem accepts all Hayes-compatible AT commands
configured by the ATSTRING setting. The following are useful AT command
settings for the internal SEL-734 modem. For a full set of supported AT
commands, please refer to the Multi-Tech
®
SocketModem
®
MT5600SMI AT
Commands Reference Guide.
Table 10.2 Modem Settings
Setting Name Setting Value Description
COMMINF Modem Communications Interface Selection
(232, 485, MODEM)
ATSTRING ATHX0E0&D0S0=1&K3
a
a
Default SW setting
Modem Initialization AT String: initial-
ization string used by the internal modem
(up to 30 characters).
PH_NUM 15093321890
b
b
The default SW setting is blank and requires user-specific setting.
Phone Number for Dial-Out: may contain
modem dial control characters (up to 30
characters).
MDTIME 60
a
Time to Attempt Dial: Time, in seconds,
from initiating dial-out to termination due
to no connection
MDRET 120
a
Time Between Dial-Out Attempts: Time
from termination on dial-out attempt until
retry dial-out
ATSTRING := AT H X0 E0 &D0 S0=1 &K3
Attention Command
Hang-Up Command*
Basic results codes are enabled
Command characters are not echoed
Modem ignores DTR
Modem Auto-answers = 1 (answer on first ring)
RTS/CTS flow control in use
*SEL recommemds that you include the Hang-up Command (H)
in all AT strings entered.
Courtesy of NationalSwitchgear.com
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