Noise, crosstalk and inductive effects can degrade the
signal and lead to incorrect results if you do not perform
the following correctly.
Shielding
Provides notes on cabling and connecting the shield as well as
further background information.
198
Digital Encoder Interface: I/O Circuit and Electrical
Characteristics
The digital encoder interface (Ch1 … Ch6) supports single-ended TTL
and differential RS422 signals (programmable by software).
Objective
The following illustration is a simplified diagram of the input circuitry.
Input circuit
1 kΩ
150 Ω
1 kΩ
4.7 nF
RS422/
Single
Ended
Converter
Digital
Converter
Interface
PHI0 (1) ... PHI0 (6)
PHI90 (1) ... PHI90 (6)
IDX (1) ... IDX (6)
PHI0 (1) ... PHI0 (6)
PHI90 (1) ... PHI90 (6)
IDX (1) ... IDX (6)
s
Signal Connection to External Devices
t
178
s
DS1103 Hardware Installation and Configuration November 2014