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[BATTERY] absolute multi-turn tracker: instant feedback without homing

RZ1337A — 25-Bit High-Precision Absolute Encoder, 12,000 rpm with RS485

Name: RZ1337A Absolute Encoder — 25-Bit Multi-Turn, 12,000 rpm, RS485
Brand: EPOCH
Price: Contact for quote USD
Availability: InStock

High-precision, high-speed multi-turn absolute encoder with 25-bit single-turn resolution and battery-backed 16-bit multi-turn counter. Features RS485 2.5MHz serial communication, 12,000 rpm maximum operating speed, and ∅10 conical shaft with 1:10 taper. Positioning accuracy <±30 arc-seconds. Designed for demanding servo motor feedback applications requiring both high speed and precision.

[USES] Uses:

This product is mainly used for servo-driven control system. Provide feedback information and auxiliary signals required by accurate position and speed control units for the system.

[FEATURES] RZ1337A Absolute Encoder Features & Specifications

•

Resolution: 25-bit (33,554,432 steps/rev)

•

Max Speed: 12,000 rpm (high-speed)

•

Positioning Accuracy: < ±30 arc-seconds

•

Interface: RS485, 2.5MHz baud rate

•

Multi-Turn: 16-bit counter (65,536 turns)

•

Shaft: ∅10 conical, taper 1:10

•

Supply: Single 5V DC ±10%

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Temperature: -20 °C to +110 °C

•

Angular Acceleration: ≤100,000 rad/s² (powered)

RZ1337A Technical Specifications — 25-Bit RS485 12,000 rpm Multi-Turn Absolute

Parameter	Specification
Single-Turn Resolution	33,554,432 (25-bit)
Multi-Turn Counter	16-bit (65,536 turns, battery-backed retention)
Absolute Positioning Accuracy	< ±30 arc-seconds (depends on motor & assembly fit)
Repeatability Accuracy	< ±30 arc-seconds (depends on motor & assembly fit)
Interface Protocol	RS485
Baud Rate	2.5 MHz \| Communication frequency ≤ 16K\| Communication frequency ≤ 16K
Shaft Diameter	∅10 conical shaft, taper 1:10
Allowable Shaft Deviation	Axial: ±0.5mm / Radial: ±0.02mm / Dip Angle: 0.1° / Endplay: <0.1mm / Runout: <0.01mm
Max Operating Speed	12,000 rpm
Moment of Inertia	2.6 × 10⁻⁶ kg·mm²
Rotor Angular Acceleration	Powered: ≤100,000 rad/s² / Battery: ≤4,000 rad/s²
Current Consumption	< 100 mA
Battery Voltage	3.6V DC (Warning: 3.1V / Fault: 2.7V)
Supply Voltage	Single 5V DC ±10%
Operating Temperature	-20 °C to +110 °C
Relative Humidity	≤90% (40°C/21d, EN 60068-2-78, non-condensing)
Ingress Protection	IP40
Mechanical Shock	980 m/s² (100G), 11ms, 3 times per XYZ (18 total)
Vibration	10-55Hz 1.5mm / 55-2000Hz 98 m/s², 2h per axis (6h total)
Rise/Fall Time	Around 100ns
Insulation Resistance	50 MΩ

Cable Definitions — 7-Pin Connector

Insert Seat	PIN2	PIN4	PIN11	PIN13	PIN6	PIN8	PIN1
Signal	5V	GND	485+	485-	Battery +	Battery GND	P
Cable Color	Red	Black	Blue	Yellow	Brown	White	Shielded Mesh

Ordering Information / Part Number

Serial Number

Absolute

Structural Form

With Bearing

1337

Appearance Char.

Model ID

Equipment ID

ID number

Resolution

25-bit

Turn Mode

P / M / S

Interface

T / S / B

Profile Ring

d65

Voltage

G0.35m

Cable

G + length

Example Part Number

RZ1337A 25 M T P 5V G0.35m

Resolution (Bits)

25 — 25bit (33,554,432 steps)

Turn Mode

M — Multi-Turn (16bit)

P — Pseudo Multi-Turn (16bit)

S — Single-Turn

Interface (Protocol)

T — 485 interface*

S — SSI interface*

B — BISS interface*

* Protocols marked with asterisk can be customized. Contact EPOCH sales for custom ordering configurations.

RZ1337A Mechanical Dimension

∅10 conical shaft with 1:10 taper. Refer to the official RZ1337A mechanical dimension drawing for full specifications including outer diameter, housing depth, and mounting hole layout. [RZ1337A Mechanical Dimension Drawing — refer to product manual]

RZ1337A Mechanical Dimension Drawing

Cross-Referencing & Retrofit Guide

The EPOCH RZ1337A is a high-precision 25-bit multi-turn absolute encoder with 12,000 rpm maximum speed, RS485 2.5MHz communication, and ∅10 conical 1:10 taper shaft. Designed for demanding servo motor feedback applications requiring a combination of high resolution, high speed, and wide temperature range (-20°C to +110°C). Engineers should verify shaft dimensions, mounting pattern, and protocol requirements before specifying.

⚠️ Trademark & Safety Notice:

EPOCH is an independent encoder manufacturer. Verify all mechanical and electrical parameters before integration.

Technical FAQs — RZ1337A Absolute Encoder

Q: RZ1337A vs Tamagawa SA48: what are the key differences in resolution and speed?

The RZ1337A delivers 25-bit single-turn resolution (33,554,432 steps/rev) at up to 12,000 rpm, double the maximum speed of most standard absolute encoders including comparable Tamagawa SA48 form-factor models. Combined with a battery-backed 16-bit multi-turn counter and a compact ∅44 mm housing, the RZ1337A achieves <±30 arc-seconds absolute positioning accuracy with RS485 2.5MHz communication — offering a high-speed alternative for demanding servo motor feedback without sacrificing precision.

Q: What position resolution and accuracy can I expect from the RZ1337A absolute encoder?

The RZ1337A achieves less than ±30 arc-seconds absolute positioning accuracy with 25-bit single-turn resolution, providing 33,554,432 distinct position counts per revolution. Repetition positioning accuracy is also <±30 arc-seconds. Note that final accuracy depends on motor and mechanical assembly fit. For multi-turn applications, the 16-bit counter tracks up to 65,536 absolute revolutions without requiring a homing cycle.

Q: Does the RZ1337A support 12,000 rpm servo applications without losing position data?

Yes, the RZ1337A operates at speeds up to 12,000 rpm continuously while maintaining absolute position tracking. This high-speed capability is enabled by the RS485 interface with 2.5 MHz baud rate, ensuring position data is transmitted reliably even at maximum rotational speed. The encoder supports rotor angular acceleration up to 100,000 rad/s² during power supply and 4,000 rad/s² when battery powered, making it suitable for high-dynamic servo motor control in CNC and industrial automation applications.

Q: What battery voltage does the RZ1337A use and when should I replace it?

The RZ1337A uses a 3.6V DC backup battery to maintain the 16-bit multi-turn position counter when the main 5V supply is off. The encoder includes built-in voltage monitoring: a warning is triggered at 3.1V, and the battery fault threshold is set at 2.7V. Current consumption is less than 100 mA, and the battery terminal is accessible via PIN6 (Battery +, Brown wire) — allowing simple replacement without dismantling the encoder.

Q: Can the RZ1337A be used as a Heidenhain or Tamagawa absolute encoder replacement?

The RZ1337A is designed as a compatible alternative for servo motor feedback applications using Tamagawa SA48 or Heidenhain form-factor absolute encoders. It features the same ∅44 mm housing, a ∅10 conical shaft with 1:10 taper, and RS485 serial interface. However, always verify that your system accepts the RZ1337A specific cable pin assignment (5V on PIN2/Red, GND on PIN4/Black, 485+ on PIN11/Blue, 485- on PIN13/Yellow, Battery+ on PIN6/Brown, Battery GND on PIN8/White) and confirm communication protocol compatibility before installation.

Q: What is the operating temperature range of the RZ1337A and is it suitable for harsh environments?

The RZ1337A operates from -20°C to +110°C, offering an extended temperature range beyond typical industrial encoders. It withstands mechanical shock up to 980 m/s² (11 ms, 3 times per direction, 18 total) and vibration from 10 to 2000 Hz (1.5 mm amplitude at 10-55 Hz, 98 m/s² at 55-2000 Hz, 2 hours per axis). The degree of protection is IP40 with relative humidity tolerance up to 90% at 40°C (21 days, per EN 60068-2-78) without condensation.

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Legal Disclaimer: All manufacturer names and trademarks referenced are for cross-compatibility reference only. EPOCH is an independent manufacturer with no affiliation to OEM brands.

Note: The product specification lists operating temperature as -20°C to +110°C (Technical Parameters) and -20°C to +105°C (Features section). The +110°C rating represents the maximum tested limit; for continuous operation within rated parameters, please consult our technical team for application-specific guidance.