Signal Levels - HEIDENHAIN TNC 426 PB/M Technical Manual

Signal levels

8 – 10
The levels of the individual signal lines differ:
n
Data lines: The data signals are defined as being logical zero (SPACE) over
the range +3 V to +15 V and logical one (MARK) over the range –3 V to –15 V.
n
Control and verification lines: These signals are defined as being ON (High)
over the range +3 V to +15 V and as OFF (Low) over the range –3 V to –15 V.
Note
For all signals: The voltage range from –3 V to +3 V cannot be evaluated.
HEIDENHAIN Technical Manual TNC 426, TNC 430