Specifications

30
Interfaces
Incremental Signals « TTL
ACU-RITE encoders with « TTL
interface incorporate electronics that
digitize sinusoidal scanning signals
with or without interpolation.
The incremental signals are transmitted
as the square-wave pulse trains U
a1
and
U
a2
, phase-shifted by 90° elec. The
reference mark signal consists of one or
more reference pulses U
a0
, which are
gated with the incremental signals. In
addition, the integrated electronics produce
their inverse signals  and £ for noise-
proof transmission. The illustrated
sequence of output signals—with U
a2
lagging U
a1
—applies to the direction of
motion shown in the dimension drawing.
The distance between two successive
edges of the incremental signals U
a1
and
U
a2
through 1-fold, 2-fold or 4-fold
evaluation is one measuring step. The
subsequent electronics must be designed
to detect each edge of the square-wave
pulse.
Interface
Square-wave signals « TTL
Incremental signals
2 square-wave signals U
a1
, U
a2
and their inverted signals
,£
Reference-mark
signal
1 or more square-wave pulses U
a0
and their inverted
pulses ¤
Pulse width 90° elec.
Signal levels
Differential line driver as per EIA standard RS-422
U
H
‡ 2.5 V at –I
H
= 20 mA
U
L
† 0.5 V at I
L
= 20 mA
Signal period 360° elec.
Measuring step after
4-fold evaluation
9-pin D-sub connector
On linear encoder or
mating connector to digital readout
Power supply Incremental signals
PIN
762345981
Signal
U
P
(V
CC
)0 VU
a1
(A+)  (A–) U
a2
(B+) £ (B–) U
a0
(R–) ¤ (R+) /
SENC 50
Black White Green Yellow Pink Red Brown Gray /
SENC 150
Brown White Green Yellow Blue Red Gray Pink /
Shield on housing; U
P
= Power supply voltage
Vacant pins or wires must not be used.
Color assignment applies only to cable.