13
Simulated Encoder Connector
9-PIN DB9 FEMALE
9
8
7 6
5 4 3 2 1
PIN 1 = A\
PIN 6 = A
PIN 2 = B
PIN 7 = B\
PIN 3 = M
PIN 8 = M\
PIN 4 = GND
PIN 9 = GND
PIN 5 = SHIELD
The phase relationship of channels A, B and M for CW rotation:
PIN
SIG
1
A\
6
A
2
B
7
B\
3
M
8
M\
The marker pulse is about .5 degrees in width. The above illustration is for 1024 line condition
(default).
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.
SW1 is provided as a means to determine the resolution of the simulated encoder signals.
SW1
1
2
3
4
LINES
12 BIT
14 BIT
MARK
ON
ON
ON
ON
2000
NO
YES
YES
OFF
ON
ON
ON
500
YES
YES
YES
ON
OFF
ON
ON
400
YES
YES
YES
(Default)
OFF
OFF
ON
ON
1024
YES
YES
YES
ON
ON
OFF
ON
250
YES
YES
YES
OFF
ON
OFF
ON
1000
YES
YES
YES
ON
OFF
OFF
ON
720
YES
YES
YES
OFF
OFF
OFF
ON
360
YES
YES
YES
OFF
OFF
OFF
OFF
4096
NO
YES
NO
The normal factory configuration of 2-Channel quadrature provides for output resolution of 12
bits or 4096 counts per revolution. There is no mark signal when 4096 is selected. The 4096
selection is only possible in the 14-bit mode of operation. The 2000 line choice is only valid in
the normal 14-bit mode.
The maximum tracking rate of the amplifier is determined by the resolver to digital converter,
the motors KE, and the TAC gradient.
