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 |
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V.25bis synchronous (HDLC framing) | %F0 | Down | Up |
V.25bis sync (BSC character framing) | %F0 | Down Down |
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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 |
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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 |
n/a | 3 - Up | 4 - Down | ||
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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