1. General Information & Overview

️· Product: Bourns EMS22D Non-Contacting Direction/Step Encoder
️· Type: Optical encoder. It uses a non-contacting method.
️· Application areas Industrial automation, Petroleum refinery, Medical, Office equipment, Audio and Broadcast Equipment.

2. Ordering Information / Part Numbering (How to Order)

The datasheet details a coded system for ordering, allowing configuration of various options.

️· Code Structure:
- EMS22D – Baseline Encoder Model.
- Digits/Letters – Define options like resolution, shaft length, voltage supply, bushing type, shaft style, and terminal configuration.
️· Example: `EMS22D51-B28-LS5` (This would be one possible configuration)
️· Specific Options & Codes (See table breakdown below)

3. Table Breakdown of Ordering Options

Category	Code	Description
Shaft Length Designator	16	1/2" Long
	20	5/8" Long
	28	7/8" Long
	25	25 mm Long (available with D bushing)
Voltage Supply	3	3.3 VDC
	5	5 VDC
Bushing Designator	S	3/8" Diameter x 3/8" Length Threaded (Single Ball Bearing)
	T	3/8" Diameter x 3/8" Length Threaded (Dual Ball Bearing)
	W	Servo Mount 7/8" Diameter (Dual Ball Bearing)
	D	9 mm Diameter x 7.94 mm Length Threaded (Single Ball Bearing)
Shaft Style		1/4" Diameter, Plain End (Available with Bushings S)
		1/4" Diameter, Flatted End (Available with Bushings S)
		1/8" Diameter, Plain End (Available with Bushings T, W)
		6 mm Diameter, Slotted End (Available with Bushing D)
		6 mm Diameter, Flatted End (Available with Bushing D)
Resolution (PPR - Pulses Per Revolution)	2	64
	3	128
	4	256
	5	512
Terminal Configuration	L	Axial, Multi-Purpose Pin
	M	Rear Ribbons Cable with Connector
	W	Rear Ribbons Cable - No Connector
Index Channel	1	1 LSB (Least Significant Bit)
	3	3 LSB

4. Physical Dimensions & Features

️· Shaft Styles: The datasheet details dimensions for Shaft Styles D and B. Exact dimensions are listed in a table within the document.
️· Cable Assembly: Information about the cable and connector configuration.
️· Max.: 2 PLCS. (likely a specification related to the assembly process)

5. Electrical Characteristics & Waveforms

️· Direction/Step Output Waveform – Details on the output signal patterns.
️· Chip Select Hardware Sample - This indicates there's information on chip selection timing or hardware interfacing.

6. Revision Information

️· Revision: 07/12 – Indicates the date of the document revision.



Important Notes:

️· This is a summarized extraction. The original datasheet contains more detailed technical information (electrical characteristics, waveform diagrams, and more detailed mechanical dimensions).
️· The codes in the ordering system are critical for specifying the correct encoder for a given application. Always consult the full datasheet for complete specifications.