PX 30 and PX 120 Operating Manual
3-1
Handshake Function
Important: The handshake function can only be applied when driving the display through
a PLC's I/O-level in parallel mode!
When the display is driven in parallel (in display and monitor mode), data communication
occurs in the handshake algorithm, which serves the handshake output HS. Its status
signalizes:
• High-level: Display is ready to receive
• Low-level: Display is not ready to receive
Data and commands received by the PX are validated with an enable signal (positive-
going pulse edge at E22 on the PX 120 and E14 on the PX 30).
Exception: Scroll inputs E16/E17 (PX 120) and E8/E9 (PX 30) operate without an enable
signal. They merely require a positive-going pulse edge at the relevant input.
The diagram overleaf illustrates the handshake function.
Driving the Display
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