Rockwell Automation 8520 9/Series CNC Integration Maintenance Manual Documentation Set - Manual (Page 304)

Section 5B
9/440HR CNC/Drive System
5B-14
Figure 5B.6
Signal Specification of HIPERFACE Devices
630_max.
90_min.
0_
0.5V
typ
0.5V
typ
CHA_HI
CHB_HI
CHA_LO
CHB_LO
2.5V (typ)
(2.2 -- 2.8)
*RS--485
reference
pulse 1
1 The reference pulse signal is output once per revolution on the RS485
interface, after power up initialization.
During the power up initialization, the RS485 channel is used to
determine:
rotational position for incremental HIPERFACE devices
absolute position and rotational position for absolute HIPERFACE
devices