Testing terminal modem control signals, Using port monitor, Port monitor – Comtrol Multiport Modems Windows 98 User Manual
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Testing Terminal Modem Control Signals
Comtrol Tools
Testing Terminal
Modem Control
Signals
This test assume Test Terminal is already running. See
on Page 34 for instructions.
The terminal window displays the modem control signals as gray or green lights at
the top of the window. The first four are inputs:
The lights are green if they are turned on, or gray if off. The text on the light also
changes from uppercase (CTS), which is on, to lowercase (cts), which is off.
Note: Ring Indicator (RI) is available on the RocketPort Plus, the RocketPort
Universal PCI and the RocketPort Plus Universal PCI Quad/Octacable
adapters
The next two lights are outputs:
Note: The signal lights behave differently on the RocketPort and RocketModem.
The signal light behavior for these two products are described as follows:
•
RocketPort - If you have a loopback plug connected and you click on one
of the outputs, the corresponding signal is sent to the input and the input
lights should toggle accordingly.
•
RocketModem - You can use RTS and DTR to send flow-control signals to
the modem. However, this does not register on the input lights.
The right-most light is the loop indicator:
If this light is on, the COM port internal loopback feature is activated and any
information or code entered in the terminal window loops back through the COM
port circuitry. If this light is off, the COM port internal loopback is deactivated,
and any information or code entered in the terminal window is sent out of the port.
Using Port Monitor
The Port Monitor program (portmon.exe) offers a summary of all RocketPort and
RocketModem statistics in one spreadsheet view. You can also use it to verify
operation of all RocketPort and RocketModem ports from a single window.
The Port Monitor display follows the familiar spreadsheet model: each COM port
is a horizontal row, and each vertical column displays a variable or value for the
respective COM port. For definitions of the abbreviations used, see the
Port Monitor can also produce statistics and reports that can help you verify the
operation of the COM ports and connected peripherals. Some immediate feedback
includes:
•
The state of the modem control and status signals
•
Open ports
•
Raw byte input and output counts obtained from the driver
•
Port errors
The available statistics include:
•
Instantaneous characters per second (CPS) calculations
•
Minute, hour, and day CPS averages and peaks
•
Carrier detect (CD) signal runtime and transition count
Reports can be automatically generated on an hourly and/or daily basis, and can
cover all ports collectively or a separate report for each port. You can also set how
often the values are recalculated, fine-tuning thoroughness against system
efficiency, and automatically run external batch files to perform additional
processing and analysis.