Overview
What is ModMon?
ModMon : Will show you a realtime display of your computer's modem status register for a given COM port
In depth
A closer look at ModMon
The name ModMon stands for Modem Monitor. ModMon will show you a realtime display of your computer's modem status register for a given COM port. This means that as your modem's status changes, ModMon will reflect these changes in its table.For each of the indicators in the display, ModMon will display a "ْ" (light bullet) to signify "off" or "low", and a "غ" to signify "on" or "high". To make ModMon display your modem's status register on a specific COM port, type ModMon #, where # is the COM port number. If you add the /b switch, ModMon will beep as your phone line rings. If a COM port you specify is not installed, you will not see a ْ or a غ in the table. For example, if you type MODMON 3, and you don't have a device on COM 3, the table will remain blank.Example: If you have a modem on COM 2, and would like to monitor its activityand hear the telephone ring through your PC speaker you would type: ModMon 2 /BHere is a list of the indicator names and their descriptions:CCT: Change in "clear to send"CDS: Change in "data set ready"CRI: Change in "ring indicator"CDC: Change in "data carrier detect"CTS: "Clear to send" set highDSR: "Data set ready" set highRNG: "Ring indicator" set highDCD: "Data carrier detect" set highHere is a further explanation of the quoted terms above.Clear to send: The modem is ready to receive characters from the PC.Data set ready: The modem is powered on and ready to operate.Ring indicator: The phone line is ringing. As the line rings, RI is heldhigh (on) so that your PC can detect the rings.Data carrier detect: The modem is connected to another modem.
Verdict
Should you download ModMon?
ModMon runs on
Windows 10/11
and is available under the
Freeware
license
— the installer is 3 KB.
We’ve catalogued it under
Networking.
✓
Verified clean. Every ModMon build on SoftLookup is scanned for viruses, spyware, adware, trojans and backdoors. We re-test on every update.
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At a glance
ModMon specifications
- Publisher
-
Jem E. Berkes
- Last updated
- Apr 28, 2026
- License
- Freeware
- Operating system
- Windows 10/11
- File size
- 3 KB
- Price
- Free
- Page views
- 642
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