10.3
Date Code 20090730 Instruction Manual SEL-734 Meter
Communications
Communications Options
FCC Compliance
The SEL-734 optional internal modem complies with Part 68 of the FCC
Rules and Regulations. The SEL-734 has a label which contains the FCC
Registration Number and Ringer Equivalence Number (REN) of the modem.
You must, upon request, provide this information to your telephone company.
The REN is useful to determine the quantity of devices you may connect to a
telephone line and still have all of these devices ring when the number is
called. In most areas, the sum of the RENs of all devices connected to one line
Table 10.3 Useful AT Commands
Command Description
EO Disables command echo
L1 Low speaker volume (Default)
L2 Medium speaker volume
L3 High speaker volume
M0 Speaker always off
M1 Speaker on during call establishment
M2 Speaker on during answer
Sr = n Write to a S register
S0 = n Number of rings to auto-answer. By default n = 0.
S6 = n Wait Time Before Blind Dialing or for Dial Tone. By default n = 2.
S7 = n Wait Time for Carrier, Silence, or Dial Tone. By default n = 50.
S8 = n Pause Time for Dial Delay. By default n = 2.
S9 = n Carrier Detect Response Time. By default n = 6.
S10 = n Lost Carrier to Hang Up Delay. By default n = 14.
S11 = n DTMF Tone Duration. By default n = 95.
S30 = n Disconnect Inactivity Timer. By default n = 0.
X0 Basic response set
&D0 Ignore DTR signal
&K3 RST/CTS flow control
&P0 Pulse dial make/break ratio of 39/61 @ 10 PPS
&P1 Pulse dial make/break ratio of 33/67 @ 10 PPS
&P2 Pulse dial make/break ratio of 39/61 @ 20 PPS
&P3 Pulse dial make/break ratio of 33/67 @ 20 PPS
Table 10.4 Useful Dialing Modifiers
Dial
Modifiers
Description
P Select Pulse dial
T Select Tone dial
W Wait for dial tome
, Pause for duration specified in S8
! Hook flash
@ Wait for silence
Courtesy of NationalSwitchgear.com
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