Westermo TD-34 - Manual (Page 17)

17 6610-2203
5.4 LED Status Indicators
PWR Power Indication. Flashes if an error is detected
DTR Data Terminal Ready modem signal
RTS Request To Send modem signal
TD Transmitted Data: Displays data received from the local RS-232/V.24 port
RD Received Data: Displays data leaving the modem on the RS-232/V.24 port
DCD Data Carrier Detect modem signal
LINE Modem is off-hook. Flashes if the dial-back function is in use
AL1 Alarm input active
AL2 Alarm output active