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Simulated Encoder Signals
For external counting or position control, a 9-pin D type female connector that has TTL
differential outputs is provided. This simulates quadrature encoder channel A and channel B
signals. A differential mark signal is also available.
ENCODER
SIMULATION CONNECTOR
P1
1
6
2
7
3
8
4
9
5
COMMENTS:
1) THE AMPLIFIER OUTPUTS ARE RS422 DIFFERENTIAL LINE DRIVER COMPATIBLE
2) THEY SHOULD BE CONNECTED TO COMPATIBLE DIFFERENTIAL RECEIVERS
3) THE BEST SHIELDING APPROACH WOULD BE TO CONNECT THE SHIELD AT THE AMPLIFIER END ONLY
4) ALL SIX WIRES AND A GND CONNECTION SHOULD BE CONNECTED AT THE CONTROLLER END
The phase relationship of channels A, B and M is as follows for CW rotation:
The marker pulse is about .5 degrees in width. The above illustration is for 1024 line
condition.
The above signals are TTL differential outputs from a DS26LS31 differential driver. The logic
0 is typically between 0 and .5 volts and logic 1's are typically between 3.3 and 4 volts.
TYPICAL ENCODER CABLE
100% SHIELD
(FOIL AND BRAID)
PIN
SIG
1
A\
6
A
2
B
7
B\
3
M
8
M\
A\
EXTERNAL CONTROLLER
A
SIGNALS AND GND
B
B\
M
M\
GND
9
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