17
———— Absolute encoder interface ————
General features
Card name ______________________ E-ABS
Card type ________________________ Option for the APC100y & APC200d application cards interfacing a
serial absolute encoder with a 25-bit:
- SSI protocol (Heidenhain EQN 425 SSI or ROQ 425 SSI or
EQN 1325 SSI type), or any other type of serial absolute encoder
with a SSI protocol with a bit number included between 1 and 25
(only E revision),
- ENDAT protocol (Heidenhain EQN425 ENDAT type), or any other
type of serial absolute encoder with a ENDAT protocol with a bit
number included between 1 and 25 (only version 3.000 or higher).
Number of absolute encoders to be
interfaced _______________________ 2 (1 in hardware B revision)
Power supply from APC ____________ 5V
Demand on 5V ___________________ 80mA max
Interfaccia encoder / Encoder interface
Encoder type _____________________ absolute
Encoder resolution ________________ 25 bit (13 bit/rev * 4096 rev.)
Encoder resolution with a multibit mode
(only from E revision) ______________ possibility to parameterize 1...25 bits
Encoder interface _________________ serial synchronous SSI protocol or ENDAT (automatic detection of
encoder type)
Interface electric level ______________ differential RS485
Suggested cable __________________ low capacitantance shielded cable (<50pF/m) suitable for 485/422
lines.
Interface signals __________________ synchronous clock and datum
Synchronous clock period ___________ to be selected among 4
μ
s, 6
μ
s, 9
μ
s (only E revision or higher).
Particular functions (only from E rev.) __ simultaneous reading of two encoders
Encoder power supply ______________ external to the card
Options for the second encoder interface
The components of the S7YQ4 kit are used to connect the second encoder to the E-ABS card
starting from the E revision.
Wire ____________________________ connection wire for the second absolute encoder
Sec. encoder interface connector _____ 9-male pole D-sub connector.
Connector housing ________________ housing for a standard 9-pole D-sub connector with a low profile.
Examples:code AMP: 0-748676-1 code 3M: 3357-6509.
