Page 460 of 894 NT7D16 Data Access card
553-3001-211 Standard 2.00 September 2004

Keyboard dialing

Keyboard dialing is an interactive dialogue mode between the connected
equipment and the DAC. This dialogue allows equipment to give dialing
commands to the DAC in order to make a data call to another far-end data
port. Keyboard dialing supports a modify mode that allows the user to modify
certain dialing parameters.
The following keyboard dialing features are supported with the DAC:
• Autobaud from 110 to 19200 bps
Call disconnection (DAC):
If the local DM user drops the call, the DAC turns
DSR, DCD, and CTS OFF for 0.2 second and
then ON.
Call disconnection (terminal):
The terminal sends a long break or three short
breaks. The DAC turns DSR, DCD, and CTS OFF
for 0.2 second, and then ON.
Mode 15 Hotline call origination
(Virtual Leased Line)
Hotline call origination by terminal:
The DAC operation is similar to mode 13 except
the terminal initiates the Hotline call by driving
DTR ON. However, if the called DM is busy or not
answering, the DAC will continuously try to
originate Hotline calls once every 40 seconds (as
long as DTR remains ON) until the Data Module
answers the call.
Call disconnection:
Disconnection is identical to mode 12.
Table 153
Connect and disconnect protocol (Part 12 of 12)
Mode of
operation Interface application Comments