EDH0199En2041 — 12/18
8
MFA Series Miniature Linear Stages
4.4
Feedback Signal Position
The incremental sensor consists of an optical scale and an encoder head.
When the carriage moves, the encoder head generates square signals in
quadrature and sends to pins #19, #20, #23 and #24 of the SUB-D25
connector.
“Encoder” are “differential pair” (type RS-422) type output signals. Using
these signals permits a high immunity to noise. Emission circuits generally
used by Newport are 26LS31 or MC3487. Reception circuits to use are
26LS32 or MC3486.
4.5
Pinouts
The pinout diagram for the MFA-PP stages mini-DIN9 connector is shown
below.
Pin #21
Pin #22
Output Signals
Encoder Phase B
Encoder Phase B
Encoders
& Sensors
Power Supply
+5 V 5%
150 mA max.
0 V
Pin #24
Pin #20
Encoder Phase A
Encoder Phase A
Pin #23
Pin #19
}
NEWPORT
STAGE
USER
Dir
0
1
Encoder
Phase A
0
1
Encoder
Phase A
1
2
3
4
0
1
Encoder
Phase B
0
1
Encoder
Phase B
Direction –
MOTION
Dir
2
6 9
1
3 7
MFA-PP
1
– End-of-Run
2
Phase 1a
3
+5 V
4
Phase 2b
5
N.C.
6
Phase 2a
7
Phase 1b
8
Ground
9
+ End-of-Run
