ZyXEL Communications 2864 Series User Manual page 39

AA Auto Answer indicator; lights up when the modem is in auto answer
mode; flashes when modem rings.
CD Carrier Detect indicator; lights up when a valid carrier is detected
present on the line.
TXD Transmit Data indicator; lights up when your DTE/computer trans-
mits data to the modem.
RXD Receive Data indicator; lights up when your DTE/computer receives
data from the modem.
The following four indicators have different meanings depending on whether the
modem is connected to a DTE (computer or terminal) through either of the parallel
or serial interfaces (SP or PCP is ON, DTE mode) or whether the modem is con-
nected to a printer through the parallel port interface (PRP is ON, printer mode).
DTR DTE mode: Data Terminal Ready indicator; lights up when the DTE
or computer indicates that it is ready for communication by raising
the corresponding RS232 signal.
POL Printer mode: Printer On Line indicator; indicates the status of the
printer's "Select" (SLCT) signal. It lights up when the printer is se-
lected and is available for data transfer.
DSR DTE mode: Data Set Ready indicator; lights up when modem is
ready for communication.
PSL Printer mode: Printer SeLect signal; indicates the signal status of
"-Select In" from modem to printer. It lights up when printer is ena-
bled to input data.
RTS DTE mode: Request To Send indicator; indicates the signal status of
RS232 signal RTS from DTE. RTS is used for hardware flow control
in asynchronous data transmission.
PPE Printer mode: Printer Paper End indicator; lights up when the print-
er is out of paper. It indicates the signal status of "PE" from the print-
er.
CTS DTE mode: Clear To Send indicator; lights up when modem can ac-
cept data for transmission. It indicates the signal status of RS232
signal CTS.
PER Printer mode: Printer ERror indicator; lights up when an error con-
dition exists in the printer, e.g., out ot paper or not on-line. It indi-
cates the signal status of "-Error" from the printer.
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