Kentrox DataSMART T3/E3 IDSU, Installation Manual, Page: 32 / 52

32 Chapter 4: Cabling interfaces and ports
Connecting control ports to a modem
Connect a modem to the DTE port after configuring the modem with the AT commands in
the list below. It is essential to configure the modem before connecting it to the DTE port
because many modems cannot be configured afterwards. This configuration sets auto-
answering, flow control, and some other parameters essential to
successful communication.
Use only a modem that is compatible with the following AT commands.
Table 1—Standard AT command set
AT
command
Action
Modem
response
ATS0=1 Auto answer on first ring OK
AT&C1 DCD is asserted by modem when connection is made OK
AT&D1 Enter command mode if DTR goes low OK
Enter the following commands carefully. The characters entered will
not be echoed and there will be no responses.
ATQ1 Modem does not return codes No response
ATE0 Modem does not echo command characters No response
AT&W0 Store current configuration as user profile 0 No response
AT&Y0 Specify user profile 0 as power-up configuration No response