24
DSC2P Hardware Manual
ETEL Doc. - Hardware Manual # DSC2P / Ver H / 6/1/11
3.1.1.2
Absolute analog encoder (EnDat 2.1)
The EnDat 2.1 is an absolute encoder. It has 1 Vptp signals with a load resistor R
0
=120
Ω.
Its signals are similar
to the incremental encoders (without the index), but it additionally includes a RS485 serial link (EIA standard,
EnDat 2.1 interface) for the absolute position measure: EDT (serial data) and ECL (clock). The ECL (clock)
signal is received from the DSC2P. From its first falling edge (latch signal), the
absolute position will be
defined within one incremental signal period
(depends on the encoder type).
The +5VDC encoder supply output is protected by the fuse F3 (1A) on JC5, JC6 and JC10.
Remark:
The cable used with an absolute analog encoder (EnDat 2.1) must have power wires with a
minimum diameter to guarantee a sufficient voltage at the terminals of the encoder (refer to the
data sheet of the encoder for more information).
D-SUB, 15 pins, female
ABSOLUTE
ENCODER
Pin #
Signal
Function
Interface
1
EDT +
EnDat serial data I/O + / RS485
2
ECL +
EnDat clock / RS485
3
ECL -
EnDat clock output - / RS485
4
+5VDC
Encoder supply output (protected by fuse F3 of 1A)
5
GND
Encoder supply output (0V)
6
COS -
Cosine - signal input
7
SIN -
Sine - signal input
8
Reserved
Do not connect
9
EDT -
EnDat serial data I/O - / RS485
10
Reserved
Do not connect
11
Reserved
Do not connect
12
GND
Encoder supply output (0V)
13
COS +
signal input
14
SIN +
Sine + signal input
15
Reserved
Do not connect
ANA
L
O
G
ENCO
DER
JC5
1
8
15
9
COS +
SIN +
COS -
SIN -
R
R
R
C
C
DSC2P
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com