Appendix A – Specifications
55
Digital Inputs (optional)
The Gemini drive has three digital inputs. Their functions are:
Input 1 Positive Limit Input
Input 2 Negative Limit Input
Input 3 User Fault Input
By default, these are +24VDC sourcing inputs. You can use VINref (pin 26) to
change the switching voltage level. You can also use CNTRL-P (pin 27) to change
the inputs from sourcing to sinking inputs. All connections are shown in the next
drawing.
Internal Connections
Same circuit design
as Input 1
VINref
Input 1 (Pos limit)
Input 2 (Neg limit)
Input Ground
Input 3 (User fault)
DRIVE I/O Connector
+24V
CNTRL-P
26
28
29
30
31
27
6.81 KΩ
20.0 KΩ
18.2 KΩ
12.0 KΩ
33.0 KΩ
33.0 KΩ
-
+
Inputs internally pulled up to
+24V, unless you connect an
external 5 – 24VDC supply to
the VINref terminal.
Inputs are sourcing at +24V,
unless you connect CNTRL-P
to ground; then inputs will be
sinking inputs.
Input voltage range:
0 – 24VDC.
Switching Levels:
Low ≤ 1/3 VINref voltage
High ≥ 2/3 VINref voltage
10 K
Ω
10 KΩ
Threshold
Sense
Pullup/Down
Sense
Inputs
You can use the INLVL and INDEB commands to configure the inputs as active
high or active low, and to set the debounce time, respectively.
CNTRL-P – Reference for Digital Inputs (optional)
Use CNTRL-P (pin 27) to change the digital inputs from sourcing inputs to
sinking inputs.
It is not necessary for you to make any connections to CNTRL-P. If you connect
nothing, then the inputs are internally pulled up to VINref. If sourcing inputs are
appropriate for your application, then make no connections to CNTRL-P.
If you connect CNTRL-P (pin 27) to digital ground (pin 30), then the inputs will
become sinking inputs, and will sink current.
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