HYDAC HDA 5500 - Manual (Page 6)

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3.2.2.7 Seriel interface (all devices)
Settings: 19200 Baud – 8 Data bits – 1 Startbit – 1 Stopbit – no
Parity Bit and no handshake.
3.2.2.8 Digital Inputs – Frequency / counter function
(HDA 5500 – 2 – X – XX – XXX)
description: Freq., Start, Stop and Clear, are 4 digital Inputs. All
those signals are active triggered to raising edge. The maximum
amplitude is 24 VDC.
TXD RXD DGND
control device
DGND
Freq. Start
Clear
Stop
0V
24VDCmax