8: Setup Mode: Channel Configuration
UDS2100 Device Server User Guide
52
e) Modem Mode
In Modem (Emulation) Mode, the unit presents a modem interface to the
attached serial device. It accepts AT-style modem commands and handles the
modem signals correctly.
Normally, there is a modem connected to a local PC and a modem connected to
a remote machine. A user must dial from the local PC to the remote machine,
accumulating phone charges for each connection. Modem Mode allows you to
replace modems with UDS2100s, and to use an Ethernet connection instead of a
phone call. By not having to change communications applications, you avoid
potentially expensive phone calls.
To select Modem Mode, set the Connect Mode to
C6
(no echo),
D6
(echo with
full verbose),
D7
(echo with numeric response),
CF
(modem responses only,
numeric response), or
CE
(modem responses only, full verbose).
Note: If the unit is in Modem Mode, and the serial port is idle, the unit can
still accept network TCP connections to the serial port if Connect Mode is
set to C6 (no echo), D6 (echo with full verbose), D7 (echo with numeric
response, CF (modem responses only, numeric response), or CE
(modem responses only, full verbose).
Without Echo
In Modem Mode, echo refers to the echo of all of the
characters entered in command mode; it does
not mean
to
echo data that is transferred. Quiet Mode (without echo)
refers to the modem
not
sending an answer to the
commands received (or displaying what was typed).
Data Echo & Modem
Response
Full Verbose:
The unit echoes modem commands and
responds to a command with a message string shown in the
table below.
Numeric Response:
The unit echoes modem commands
and responds to a command with a numeric response.
Modem Responses Only
Full Verbose:
The unit does not echo modem commands
and responds to a command with a message string shown
in the table below.
Numeric Response:
The unit does not echo modem
commands and responds to a command with a numeric
response.
