IDS Sensors
PAGE 209
Real-Time Digital Interfaces
The IDS3010 is delivered with a standard set of high-speed interfaces for real-time data communication with FPGA-based or RTOS receivers. These interfaces consist of an incremental AquadB, a proprietary serial word (HSSL),
and a synthetic analog sin/cos signal. All signals can be outputted as either single-ended (LVTTL) or differential
(LVDS). Interface parameters can be configured in the web interface section of the IDS. All interfaces provide
maximum bandwidth at highest resolution.
DAT
DAT
CLK
CLK
DAT
DAT
A
CLK
ABCLK
A
A
BB
A
1
0
1
1
1
0
1
1
1
0
1
0
AquadB (digital; bandwith up to 25 MHz; resolution freely assignable): The AquadB interface provides incremental displacement information on target displacement. Position resolution and (maximum) clock rate can be user
defined using the IDS web interface.
For maximum data bandwidth, the AquadB interface is best used with differential signaling.
B
B
A
A
A
B
B
1
HSSL (digital; bandwith up to 25 MHz and 8-48 bit resolution): attocube's proprietary serial word protocol provides absolute position information - both in terms of the protocol and the measurement itself. The HSSL inter0face consists of one data and one clock signal (single ended or differential); position information is packed into
one container of user-defineable bit-length, synchronization with the receiver is accomplished using the clock
0signal. The HSSL protocol is preferential if absolute displacement position data (i.e. sensor-target separation) is
required or if incremental position counting is inacceptable.
B
Sin/cos (analog; bandwith up to 25 MHz; resolution freely assignable, 1pm - 224 pm): The sin/cos signal is a digitally
synthesized analog signal which provides incremental position information. As with the digital AquadB signal, the
increment (i.e. resolution) is user-definable in the system's web interface. For maximum data bandwidth, the sin/
cos signal is best used with differential signaling.
Industrial Interfaces (optional)
In addition to the standard real-time interfaces, the IDS provides (optional) interconnectivity with industrial networks such as Ethernet (TCP/IP), EtherCAT, CanOPEN, Profinet, and Profinet RT.
EtherCAT (Ethernet for Control Automation Technology) is an open, real-time Ethernet-based fieldbus network originally developed by Beckhoff. The EtherCAT protocol is most typically used for machine control and regulation as
well as for multi-channel, synchronous measurement devices.
Profinet is a protocol based on industrial Ethernet according to IEEE 802. It connects devices, systems, and cells,
facilitating faster, safer, less costly and higher quality manufacturing.
Profinet RT is the real-time derivative of Profinet.
CANopen is a communication protocol based on CAN (Controller Area Network) which is most typically used for
the interconnection of complex, embedded systems used in automation. Apart from communication, the CANopen
protocol also provides device specification.
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