SSI Hollow Shaft Absolute Encoder SAS/M90

Employs high-precision magnetic sensing technology, providing both single-turn and multi-turn encoder solutions.
Supports the SSI interface with a clock frequency up to 2 MHz, enabling high-speed and accurate data transmission.
Optional incremental signal outputs (TTL/HTL) are available to meet diverse control requirements.
Single-turn resolution up to 21 bits, with multi-turn resolution up to 14 bits, ensuring high-accuracy measurement.
Features exceptional shock and vibration resistance, with a protection rating up to IP68 for operation in harsh environments.
Built-in reverse-polarity and short-circuit protection effectively reduces the impact of installation errors on the encoder.

Product Specifications (SSI Signal Output Series)

Parameter	SAS/M90A (Hollow Shaft Type)	SAS/M90B (Hollow Shaft Type)
Shaft/Bore Diameter	Ø 10, 12, 14, 15, 16, 20, 25, 28 mm (customizable up to Ø 28 mm bore)
Housing Material	Aluminum (stainless steel housing optional)
Signal Output Interface	SSI; SSI + Incremental
Maximum Response Frequency	2 MHz
Start-Up Time	< 1 s
Output Driver	SSI (RS422) / Incremental (RS422)
Function	Single-turn or Multi-turn
Supply Voltage	Standard 10–30 VDC
Single-Turn Resolution	Standard: 12-bit 4096, 13-bit 8192, 16-bit 65536, 18-bit 262144; max. 21-bit
Number of Turns	1 turn (single-turn); multi-turn standard 12-bit 4096 turns; optional up to 14-bit 16384 turns
Power Consumption	≤ 1.5 W
Interface Cycle Time	≥ 16 μs
Manual Functions	Direction of rotation, zero reset
Code	Gray code or binary code
Clock Input / Speed	Clock input: RS422; clock frequency: 100 kHz–2 MHz
Safety Protection	Reverse polarity protection: Yes; short-circuit protection: Yes; lightning and ESD protection: Yes
Mechanical Characteristics	Max. speed: 6000 r/min	Shaft load: radial 200 N, axial 100 N
Environmental Ratings	Protection rating: IP65 or IP68; starting torque: < 0.01 Nm
Temperature Range	Operating: -30℃…85℃ (customizable -40℃…85℃); Storage: -40℃…100℃
Mechanical Strength	Shock resistance: 1000 m/s², 6 ms (100 g); vibration resistance: 20 g
Connection / Cable Exit	Connection: shielded cable, M12 5/8-pin, M23 12-pin male; cable exit: radial side exit, axial rear exit
Options	Incremental output TTL/RS422, HTL/push-pull
Incremental Signals	A+ A- B+ B- Z+ Z-
Pulses per Revolution	Selectable from 1 to 4096 pulses (standard: 1024, 2048, 4096)

Wiring Definition

Signal	GND	UB	C+	C-	D+	D-	SET	DIR	⏚
M23 Connector, 12-pin	1	2	3	4	5	6	7	8	-
Wire Color	White	Brown	Green	Yellow	Gray	Pink	Blue	Black	Shield

Signal	A	A-	B	B-	Z	Z-
M23 Connector, 12-pin	9	10	11	12	-	-
Wire Color	Red	Pink-Gray	Purple	Red-Blue	-	-
Notes	1. When using an M23 12-pin counterclockwise receptacle, only A and B signals are provided by default; full signals are optional. 2. The default incremental resolution is 1024 lines.

Top View of Pin Connector

Connector Type	5-pin M12 Connector	8-pin M12 Connector	12-pin M23 Connector
Top View of Connector

Mounting Dimensions

SAS/M90A

SAS/M90B