The Option Switches

The Option switches allow you to control the operation of your modem in Dumb mode, as well as providing additional features in Smart mode.

For users of modems with front panel Option switches only

Front panel Option switches 1 and 2 always take precedence over software setting of behaviour of DTR and DSR. When AT%F is set to 1 (when AT%F is set to 0, behaviour of DTR and DSR is controlled by AT commands if applicable).

Switches 1 and 2 are used to select AT command mode or V.25bis command mode, or control the state of the DTR and DSR signals.

Description

AT%F

Switch 1

Switch 2

AT command mode

%F0

Up

Up

V.25bis asynchronous

%F0

Up Down

 

V.25bis synchronous (HDLC framing)

%F0

Down

Up

V.25bis sync (BSC character framing)

%F0

Down Down

 

DTR controlled by computer

%F1

Up

n/a

DTR assumed to be asserted (raised)

%F1

Down

n/a

DSR acts normally

%F1

n/a

Up

DSR mimics DTR

%F1

n/a

Down

n/a = not applicable

 

 

 

Switches 3 - 6 allow you to set up Dumb mode operation, as well as manually selecting loopback tests in Smart mode.

Description

AT#F

Switch

Switch

Smart mode

n/a

4 - Up

n/a

Dumb mode

n/a

4

- Down

n/a

Loopback Test Pattern Off

#F1

3 - Up

4 - Up

Loopback Test Pattern On

#F1

3 - Down

4 - Up

Analog Loopback Off

#F1

5 - Up

4 - Up

Analog Loopback On

#F1

5 - Down

4 - Up

Remote Digital Loopback Off

#F1

6 - Up

4 - Up

Remote Digital Loopback On

#F1

6

- Down

4 - Up

Auto-answer enabled

n/a

3 - Up

4 - Down

Auto-answer disabled

n/a

3

- Down

4 - Down

Asynchronous operation

n/a

5

- Up

4 - Down

Synchronous operation

n/a

5 - Down

4 - Down

Answer mode

n/a

6 - Up

4 - Down

Originate mode

n/a

6 - Down

4 - Down

+ n/a = not applicable

 

 

 

 

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Telenetics 56 manual Option Switches, Description, At%F, At#F