Signal Designations - HEIDENHAIN TNC 426 PB/M Technical Manual

Signal designations

Pin layouts
December 2001
One must differentiate between the following types of lines and their signals:
n
Data lines:
• TxD Transmitted data
• RxD Received data
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Control and signal lines:
• DCD (Data Carrier Detect):
Received signal level. The receiver signals that the information it has
received lies within the defined level. The DCD signal (pin 8) is not used
by the TNC. The TNC delivers no signal from this pin.
• DTR (Data Terminal Ready):
TNC ready / not ready for service (e.g. the receiving buffer is full, the
signal DTR indicates "LOW").
• DSR (Data Set Ready):
Peripheral ready / not ready for service.
• RTS (Request to Send):
Switch transmission unit on. TNC wishes to transmit data.
• CTS (Clear to Send):
Readiness for transmission. The peripheral wishes to transmit data.
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Ground conductors (lines for power supply):
• Chassis GND:
Housing connection
• Signal GND:
0-Volt lines for all signals
The pin layout of the TNC logic unit is different from that of its adapter block.
TNC Data Interfaces 8 – 11