1768 HEIDENHAIN Technical Manual MANUALplus 620
Signal designation One must differentiate between the following types of lines and their signals:
Data lines:
• TxD Transmitted data
• RxD Received data
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 is not used by the
control. The control delivers no signal from this pin.
• DTR (Data Terminal Ready):
Control is ready / not ready for operation (e.g. the receiving buffer is full,
the signal DTR indicates "LOW").
• DSR (Data Set Ready):
Peripheral device ready / not ready for service.
• RTS (Request to Send):
Switch transmission unit on. The control wishes to transmit data.
• CTS (Clear to Send):
Readiness for transmission. The peripheral wishes to transmit data.
Ground conductors (lines for power supply):
• Chassis GND:
Housing connection
• Signal GND:
0 V lines for all signals
Pin layout Keep in mind that there might be a difference between the pin layout of the
control and the adapter block.
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