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4.5 Other I/O
4.5.1 Encoder interfaces - X12, X13, X14, X15, X16
5
1
9
6
Up to five incremental encoders may be connected to NextMove PCI. Each input channel
uses a MAX3095 differential line receiver with pull up resistors and terminators. Encoders
must provide either 5V differential signals or RS422/RS485 differential signals. The maximum
input frequency is 7.5 million quadrature counts per second. This is equivalent to a maximum
frequency for the A and B signals of 1.87MHz. The shell of the connector is connected to
pin 4. The use of individually shielded twisted pair cable is recommended. See section 4.5.3
for details of the encoder power supply.
Breakout
module
X12
CHA+
5
CHA-
9
Figure 7 - Encoder channel input circuit - Encoder C, Channel A shown
MN1903
Location Breakout module, connectors X12, X13, X14, X15, X16
Pin Name
1 Encoder V+
2 CHZ+
3 CHB-
4 Shield
5 CHA+
6 CHZ-
7 GND
8 CHB
9 CHA-
Description
Five identical encoder inputs, each with complementary A, B and Z
channel inputs on a 9-pin female D-type connector
NextMove PCI
100
pin
cable
10R
150R
10R
Description
Power supply to encoder
Index channel signal
Channel B signal complement
Shield connection
Channel A signal
Index channel signal complement
Power supply ground
Channel B signal
Channel A signal complement
Vcc
3k3
MAX3095
3k3
Encoder
input
circuit
Input / Output 4-15
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