User Guide

Chapter 3 - Operation
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Multi-Tech Systems, Inc. MT5656ZDX User Guide
Chapter 3 - Operation
Like any modem, your Multi-Tech modem operates only under the control of a communications program, such as the
communications program included with your modem. It also operates under other general-purpose data communication
programs, such as Windows Terminal and HyperTerminal. For information on how to use the modem with the
communications program of your choice, please refer to the documentation provided with the data communications program.
An experienced modem user can configure the program’s software to change the way the software interacts with a modem
and configure the modem to change the way it operates.
About the LED Indicators
The modem has ten LED indicators on the front panel that indicate status and activity:
Figure 2–1. Front panel
TD
Transmit Data
Flashes when the modem is transmitting data to another modem.
RD
Receive Data
Flashes when the modem is receiving data
from another modem.
CD
Carrier Detect
Lights when the modem detects a valid carrier
signal from another modem. It is on when the modem
is communicating with the other modem, and off when the link is broken.
OH
Off-Hook
Lights when the modem is off-hook, which occurs when the modem is dialing, online, or answering a
call. The LED flashes when the modem pulse-dials.
TR
Terminal Ready
Lights when a communication program is using the modem. It means the modem is ready for an
outgoing or incoming call. It goes off when the communication program disconnects the serial port.
When it goes off, a connected modem will disconnect.
Note: When you turn on the modem, the PWR indicator lights; and if a terminal program is running, the TR
indicator also lights.