
User’s Guide & Reference 41
Section E : Technical Quick Reference
Section D includes information about:
• Front Panel Lights
• Command Summary
• S-Registers
• The Serial Interface (cable information)
Front Panel Lights (external modems)
Symbol Meaning Status
AA.......... Auto Answer Answer mode: ON when register
S0 is set to 1 or higher (Auto
Answer), and when answering a
call; OFF when modem originates
a call. Light flashes when there is
an incoming call.
CD ......... Carrier Detect ON if modem receives a valid data
signal (carrier) from a remote
modem, indicating that data
transmission is possible. Always
ON if CD override is ON (&C0).
RD ......... Received Data Flashes when modem sends result
codes or passes received data bits
from remote.
SD ......... Send Data Flashes when computer sends a
data bit to modem.
TR.......... Data Terminal Ready ON if modem receives a DTR
signal from computer. Always ON
(modem ignores DTR) if the DTR
override is ON (&D0).
CS ......... Clear to Send ON until modem lowers CTS when
Transmit Data hardware flow
control is enabled (&H1, &H3).
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