Applied Motion STM23R-2ND - Manual (Page 17)

17
STM23R Hardware Manual 920-0056C
5/5/2015
Using the Optional Encoder
The STM23R-2NE and STM23R-3NE each come with a 1000-line, incremental encoder assembled to the rear
shaft of the unit. The A, B and Index (Z) channel signals of this encoder can be connected back to the external
controller for position verification and enhanced performance, depending on the features of the controller. To
facilitate connecting the encoder signals to your external controller you should purchase cable part number
3004-263.
Incremental encoder specifications:
• 10-pin connector provides the following signals (pin assignments): Ground (1, 2), Index− (3), Index+ (4),
• A− (5), A+ (6), +5VDC power (7, 8), B− (9) and B+ (10).
• Power supply requirements: 5 VDC at 56 mA typical, 59 mA max.
• The encoder’s internal differential line driver (26C31) can source and sink 20 mA at TTL levels. The recom-
mended receiver is industry standard 26C32.
• Maximum noise immunity is achieved when the differential receiver is terminated with a 110-ohm resistor in
series with a .0047 microfarad capacitor placed across each differential pair. The capacitor simply conserves
power; otherwise power consumption would increase by approximately 20mA per pair, or 60mA for 3
pairs.
• If making your own cable to connect the encoder signals to your controller, we recommend using a shielded
cable with four or five twisted pairs for improved noise immunity.
• Max encoder frequency is 100,000 cycles per second.
PIN 1
PIN 2