Product Description
The PhidgetEncoder Highspeed 4-Input can
be used with a wide assortment of mechanical
and optical encoders. The encoder should be
of quadrature output type, indicating that
there will be two quadrature output channels
(usually labeled A and B) and a third output
channel (only on some encoders) to signal
when the index pin (a reference point for
zero position or a complete revolution) has
been reached.
The PhidgetEncoder Highspeed 4-Input is able
to read four encoders simultaneously. Encoders
are not powered up until all initialization
of the device is complete. It is possible
to enable some or all encoders, depending
on how many of the channels are being used.
This can also be used to reduce power consumption
when certain encoders are not needed.
The PhidgetEncoder Highspeed 4-Input has
the added ability to time the duration between
a group of quadrature changes. The time is
returned in microseconds. This time value
can be used to calculate velocity and acceleration.
Both mechanical and optical encoders are
available, with optical encoders dominating
at > 100 counts per second. Review the
data sheet for the encoder you are planning
to use to ensure it is compatible with the
PhidgetEncoder Highspeed 4-Input. Almost any
incremental quadrature encoder will work but
it is important to verify this before connecting
it to the Phidget. Absolute encoders will
not work with this device. Ideally, you should
choose a quadrature encoder with a 5-pin output
and the following pinout in order to be directly
compatible with the 1047.
Product Specifications
Characteristic |
Value |
| Encoder |
| Maximum Count Rate
|
250,000 counts/second
|
| Internal Output
Pull-Up Resistance |
10 kilo Ohms |
| Software Update
Rate (typical) |
8ms |
| USB Update Rate
|
125 samples/second
|
| Time Resolution |
1 µs |
| Current |
| Max Device Current
Consumption (all channels enabled) |
500 mA |
| Min Device Current
Consumption (all channels disabled) |
30 mA |
| Maximum Current
Consumption per Encoder |
200 mA |
| Maximum Current
Consumption for all Encoders |
470 mA |
| Voltage |
| Min/Max USB Supply
Voltage |
4.75 - 5.25 VDC |
| Encoder Input Low
Voltage |
< 1.4 V |
| Encoder Input High
Voltage |
> 1.8 V |
