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2. Unit Description
2.1. Front Panel Indicators
À
ON: Indicates power to the unit is ON.
Á
RDY: Indicates unit is Ready to operate. A steady blink indicates that the CAS-81 is
operating normally.
Â
TXD: Indicates that data is being received at Control Port pin 2.
Ã
RXD: Indicates that data is being transmitted out Control Port pin 3. Also indicates that
data is being received by pin 2 of a selected Serial Port.
Ä
RTS: Indicates that the "Request to Send" signal is present at Control Port pin 4.
Å
CTS: Indicates that the "Clear to Send" signal is present at Control Port pin 5. Also
indicates that the "Clear to Send" signal is present at pin 8 of a connected Serial Port.
Always high when all ports are disconnected.
Æ
DTR: Indicates that the "Data Terminal Ready" signal is present at Control Port pin 20.
Ç
DCD: Indicates that the "Data Carrier Detect" signal is present at Control Port pin 8.
Also indicates that the "Data Carrier Detect" signal is present at pin 1 of a connected
Serial Port. Always high when all ports are disconnected.
È
Serial Ports 1 - 8: Indicates that the corresponding numbered Serial Port is currently
connected.
2-1
Figure 2.1: Front Panel Indicators