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4.0 General Operation and Special Features
4.9.4 DTE D
ISPLAYS
When Auto-Display is enabled, an update of the LCD is automatically
displayed on the DTE screen each time a command (E, 1, 2, 3, left arrow,
or right arrow) is entered to control the front-panel LCD on the connected
modem. Auto-Display is enabled when the long-form connect command
(CONNECT) is used.
Auto-Display is disabled when the CON command is used. However, even
with Auto-Display disabled, the D command can be used to display the LCD
screen.
The CONNECT command also enables echo and line feed on the DTE
screen, whereas both are disabled when CON is used. Data from the
connected modem is easier to read when CONNECT is used; however,
data throughput is faster if CON is used.
On the Modem’s front-panel LCD, a selected option flashes so it is easily
identified as the current selection. When an LCD display is sent to the DTE
in response to the CONNECT command, characters flashing on the LCD
are indicated on the DTE screen by asterisks. An asterisk appears below each
flashing character. In the example below, the selected CTS to EIA option
is TRUE.
Actual LCD on connected modem:
CTS to EIA
NORM RTS TRUE
DTE display:
CTS to EIA
NORM RTS TRUE
****
Asterisks denoting flashing characters are also displayed if the D command
is used to request a display of the LCD—provided the connect command last
used was CONNECT and not CON. Even when the CON command is used
(meaning the LCD of the connected modem is not automatically displayed),
a computer reading data from the diagnostic port is able to determine which
characters are flashing because bit 7 (MSB) is set in each flashing character.
4.9.5 D
ISCONNECTING
F
ROM
A D
IAGNOSTIC
L
INK
There are two ways to disconnect from a modem-DTE diagnostic link:
• If you want to connect to another modem, issue the CONNECT command
followed by the address of the modem to which you want to connect.
The DTE disconnects from the first modem and immediately connects
to the one you specified.