3460 Fast’R

 

 

 

AT Command Set (continued)

 

 

 

Command

Option

Description

 

 

 

&D

DTR Control

 

 

Determines how the modem interprets DTR signal.

 

 

 

0

=High. The modem ignores DTR from the computer; it

 

 

reads DTR as always asserted. Choose this option for

 

 

DTR/CTS flow control with error correction, or if the

 

 

computer does not provide DTR signal.

 

 

 

 

1

=Escape

 

 

 

 

2

=Disconnect

 

 

 

 

3

=Reset. The modem hangs up (if connected) and loads

 

 

the specified option set when an asserted-to-

 

 

deasserted DTR transition occurs. If DTR is deasserted,

 

 

the modem auto answers.

 

 

 

 

4

=Tail

 

 

 

 

5

=108.1. A deasserted-to-asserted DTR transition

 

 

instructs the modem to connect to the telephone line. If

 

 

the modem detects an incoming ring, it answers the call.

 

 

If the modem does not detect an incoming call, it dials

 

 

the number specified by the Default Dial option. An

 

 

asserted-to-de-asserted DTR transition disconnects the

 

 

modem from the telephone line.

 

 

When configuring the modem for V.25bis synchronous

 

 

direct-dial operation (DTR Control 108.1, AT&D5), the

 

 

ACU option must be set to No ACU (AT*AC0).

 

6

=108.2. When the modem is disconnected from the

 

 

telephone line and the computer asserts DTR, the

 

 

modem responds to all AT commands. When the

 

 

computer de-asserts DTR, the modem does not respond

 

 

to dialing and answering AT commands, but responds to

 

 

all other AT commands. The DTR signal must remain

 

 

asserted throughout the connection. An asserted-to-de-

 

 

asserted DTR transition disconnects the modem from the

 

 

telephone line. If DTR is

 

 

de-asserted, the modem does not auto answer.

 

 

 

 

7

=Busyout

 

 

 

The characters AT or at precede all commands except: +++, #####, and A/

 

 

 

Parameters and options shown shaded gray vary by country. For your country’s options,

refer to the 3460 Fast’R Reference Guide (T0022).

Default (pre-set) options are underlined.

 

 

 

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Image 134
Motorola 3460 manual DTR Control