Continuum CPU Reference
29
CommPort Activity Indicators
There are four sets of CommPort activity indicators—one for each CommPort. The
indicators in this group report on the following:
TD
The TD (for Transmit Data) indicator flashes quickly as data is being transmitted out
through the CommPort.
RD
The RD (for Receive Data) indicator flashes quickly as data is being received through
the CommPort.
Modem Activity Indicators
These indicators are applicable only if your NetController module is equipped with an
internal modem option. The indicators in this group report on the following:
DCD
The DCD (for Data Carrier Detected) indicator is ON if the modem has detected and
synchronized with an external carrier signal from another modem.
DTR
The DTR (for Data Terminal Ready) indicator is ON if the modem has asserted DTR,
or if the device attached to the RS-232/RJ-45 connection for COMM 3 has asserted
DTR.
SELECTED
This indicator is ON if the modem has been enabled via the MODEM-RS-232
OVERRIDE push button. When it is ON, it indicates COMM Port 3 is in Modem
mode. When OFF, COMM Port 3 is a general RS-232 port.
I/O Bus Activity Indicator
This indicator reports on the following:
STATUS
The STATUS indicator flashes rapidly as data is being transmitted out across the I/O
Bus.
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