Front Panel Lights (External Modems) - 3Com 000839-08 Manual

Front Panel Lights (External Modems)

Symbol Meaning
AA ........ Auto Answer.................Answer mode: ON when register S0 is set to 1 or higher (Auto
CD......... Carrier Detect ...............ON if modem receives a valid data signal (carrier) from a remote
RD......... Received Data...............Flashes when modem sends result codes or passes received data
SD ......... Send Data .....................Flashes when computer sends a data bit to the modem.
TR ......... Data Terminal Ready .....ON if modem receives a DTR signal from computer. Always ON
CS ......... Clear to Send.................ON until modem lowers CTS when Transmit Data hardware flow
ARQ/ Error Control/
FAX....... Fax Operations ..............
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T Q R
ECHNICAL UICK EFERENCE
Status
Answer), and when answering a call; OFF when modem originates
a call. Light flashes when there is an incoming call.
modem, indicating that data transmission is possible. Always ON if
CD override is ON (&C0).
bits from remote.
(modem ignores DTR) if the DTR override is ON (&D0).
control is enabled (&H1, &H3).
Data Mode: Automatic Repeat Request. ON if modem is set to &M4 or &M5 and
successfully establishes an error control connection. Flashes when modem
retransmits data to remote modem. Fax Mode: Flashes to indicate fax mode.