MT202TD User Guide
Modem LED Indicators
Figure 2-2. LED Display
The MT202TD has seven diagnostic LED indicators. They are:
TD | Transmit Data - This LED blinks when data is being |
| transmitted: on for a space; off for a mark. The state of |
| this LED matches the TD circuit on Pin 2 of the RS- |
| 232C/V.24 interface. |
RD | Receive Data - This LED blinks when data is being |
| received: on for a space; off for a mark. The state of this |
| LED matches that of the RD circuit on Pin 3 of the RS- |
| 232C/V.24 interface. |
CD | Carrier Detect - This LED lights when a valid carrier |
| tone has been detected. |
CTS | Clear to Send - This LED lights when the modem |
| responds to a Request to Send signal after a fixed |
| delay. The terminal equipment may start transmitting |
| data after this signal is on (high). |
RTS | Request to Send - This LED lights when the Request |
| to Send signal from the DTE is on. |
DSR | Data Set Ready - This LED lights when the modem is |
| powered on. |
TM | Test Mode - This LED lights when the modem is in Test |
| Mode. |
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