4.5 I/O Signal Connections
4.5.4 I/O Circuits
4-44
• Precaution When Host Controller Uses Open-Collector Output with User-Supplied Power Sup-
ply
The SERVOPACK may fail depending on the relationship between the pull-up voltage (Vcc) and
the pull-up resistance (R1). Before you wire the circuits, confirm that the specifications of the
host controller satisfy the values shown in the following table.
Pull-Up Voltage (Vcc) Pull-Up Resistance (R1)
24 V 1.8 kΩ to 2.7 kΩ
12 V max. 820 Ω to 1.5 kΩ
5 V max. 180 Ω to 470 Ω
Circuit Example for Open-Collector Outputs
SERVOPACK
VF = 1.5 V to 1.8 V
Vcc
Tr 1
V
F
R1
i
Host controller
150 Ω
4.7 kΩ
Pull-up
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