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NT7D16 Data Access card Page 423 of 894
Circuit Card Description and Installation
Independent storage of dialing parameters
Two dialing parameters, DCD control, and Answer mode, can be modified by
both keyboard and Hayes dialing commands.
The Hayes dialing mode also allows the user to modify the Input echo control,
and Prompt/Result codes transmit control. With keyboard dialing, the Input
echo control and Prompt/Response codes control are determined by the
downloaded parameters. They cannot be altered through dialing commands.
The DAC maintains separate buffers for keyboard and Hayes dialing modes.
Changes made to a given parameter in one mode do not affect that parameter
in the other mode. When a dialing mode is selected, the DAC copies the
corresponding dialing parameters into the active buffer. This buffer controls
the call processing.
If the DAC receives an incoming call while idle, the most recent dialing mode
is used to answer the call.
User input
User input may include either upper or lower case ASCII characters.
All entries are accumulated in an input record. This record is completed with
a Terminator character. For keyboard dialing, this character is always <CR>;
for Hayes dialing, it can be user defined (but default to <CR>). The entries
are not processed until the Terminator character is received.
The input record is limited to 43 characters, including the Terminator, but
excluding any ignored space characters.
The record can be edited by using the backspace and escape characters.
Operating modes
There are sixteen possible RS-232-C operating modes with three basic
common modes of operation which correspond to three types of equipment
connected to the DAC. The three modes are: modem, terminal, and host. Host
mode is a subset of the terminal mode, which only suppresses the prompts at
the terminal.