Bosch Rexroth GDS02.1-2048-014V-H12,0 Rotary Encoder

Description

• Model breakdown​ (Rexroth GDS02.1 naming) :
  • GDS​ = GDS series rotary encoder (absolute, for servo motor feedback)
  • 02​ = 2-line (family code)
  • .1​ = Design 1
  • 2048​ = 2048 increments​ (incremental signal, 2048 ppr) — this is the incremental track resolution; the absolute track is 13-bit (8192 positions/rev) via EnDat 01
  • 014V​ = Supply voltage 3.6…14 V DC​ (max current ≤160 mA)
  • H12,0​ = Hollow shaft, 12.0 mm diameter​ (one-side open hollow shaft, D=12mm, permitted axial shaft movement ±1mm)
  • → GDS02.1-2048-014V-H12,0 = Singleturn absolute encoder, 2048 inc, 3.6–14V supply, 12mm hollow shaft, EnDat 01 interface

⚠️ This is NOT a simple 2048 PPR incremental encoder!​ Despite the “2048” in the model number, the GDS02.1 is a hybrid absolute + incremental encoder:

• Absolute channel: 13-bit (8192 positions/rev) singleturn, EnDat 01​ protocol — provides absolute position without homing
• Incremental channel: 2048 increments/rev, 1 Vpp sinusoidal output, limit frequency ≥400 kHz
• The “2048” refers to the incremental track resolution, NOT the absolute resolution. This is a common misinterpretation: many distributors mistakenly list it as “pure incremental 2048 PPR, HTL, solid shaft” — that is incorrect. The authoritative Rexroth datasheet clearly states: EnDat 01 absolute (8192/rev) + incremental 2048 inc, 1 Vpp, hollow shaft 12mm, supply 3.6–14V, flange socket​ electrical connection .

If your application expects a simple HTL/TTL 2048 PPR solid-shaft encoder → this GDS02.1 is the wrong device. This is specifically a Rexroth servo feedback encoder​ requiring an EnDat-capable drive (IndraDrive, Indramat, or equivalent).

💡 Nameplate “748 882-09” = Rexroth internal ID. On the physical encoder, you’ll see engravings like:

GDS2.1 / R911323378
D 748 882-09 IA10
SN 635 115 687 A

The “748 882-09” is Rexroth’s internal manufacturing/device code — it does NOT change the order number. When ordering a replacement, always use the R911323378 / GDS02.1-2048-014V-H12,0​ order code. The “748 882-09” simply helps verify you’re getting the exact same unit as the one on your machine.

Key Features​

• Absolute + Incremental hybrid: EnDat 01 absolute (8192/rev, 13-bit) + 2048-inc 1 Vpp incremental — best of both worlds for high-precision servo control
• EnDat 01 interface: Bidirectional synchronous serial protocol, fully digital, immune to noise
• 1 Vpp incremental output: High-resolution sinusoidal signal for high-speed interpolation
• 12mm hollow shaft: Direct mount onto 12mm motor shaft — no coupling needed, zero backlash
• Wide supply range 3.6–14V: Compatible with IndraDrive’s encoder power (typically 8–14V)
• Flange socket electrical connection: Rugged industrial connector, up to 75m cable length
• High speed: Mechanical permitted speed up to 12,000 min⁻¹​ (12,000 rpm) — suited for high-speed spindle/servo applications
• Low starting torque: ≤0.01 Nm — negligible load on the measured shaft
• IP67 housing / IP64 shaft: Dust-tight, temporary water immersion resistant
• Wide temperature range: -40°C to +100°C operating — suitable for harsh industrial environments
• Vibration/shock rated: 55–2000 Hz ≤300 m/s² vibration, 6ms ≤1000 m/s² shock (EN60068-2-6/2-27)

Technical Specifications (GDS02.1-2048-014V-H12,0 — R911323378)

⚠️ Critical compatibility checklist:

1. Must pair with EnDat 01 drive​ — This encoder speaks EnDat 01 absolute protocol. Your drive MUST support EnDat 01 (Rexroth IndraDrive does natively; third-party drives need EnDat 01 master). A standard incremental TTL/HTL drive will NOT read this encoder correctly.
2. 12mm hollow shaft only​ — The encoder slides directly onto a 12mm diameter motor shaft. If your motor has a different shaft size (e.g., 10mm, 14mm, 16mm), this GDS02.1 will NOT fit. Measure your shaft diameter precisely.
3. Flange socket connector​ — The electrical interface is a Rexroth-specific flange socket. You need the mating cable assembly (Rexroth hybrid cable, e.g., RKG or RSG series) to connect to the drive. Standard M12/M23 connectors will NOT work.
4. 3.6–14V supply​ — Driven by the IndraDrive’s encoder power output (typically 8V or 14V). Do NOT apply 24V — it will destroy the encoder.
5. Singleturn, not multiturn​ — After power cycle, absolute position within the current revolution is known, but the “turn count” is lost. If your application needs multi-revolution absolute tracking → use GDM02.1-2048-014V-H12,0​ (R911323380) instead.
6. “748 882-09” is just the nameplate ID​ — When ordering, always specify R911323378 / GDS02.1-2048-014V-H12,0. The “748 882-09” code alone may not be recognized by all distributors — it’s Rexroth’s internal manufacturing traceability code.

Warranty & After-Sales

• Factory new units: 12 months warranty
• Refurbished units: 3-6 months warranty (bench: 14V supply applied, EnDat 01 communication test with IndraDrive (HCS01/02) → absolute position read-back accurate, incremental 1 Vpp signal verified on oscilloscope at 2048 ppr, flange socket continuity test, 12mm hollow shaft fit verification)
• Technical support for:
  • Exact replacement verification​ (confirm your existing encoder nameplate reads “GDS2.1 R911323378” + “748 882-09” — this is a 100% form-fit-function replacement. If your old unit says “GDM2.1” → you need R911323380, NOT this one)
  • EnDat 01 drive compatibility​ (Rexroth IndraDrive HCS01/HCS02/HCS03, HMD01 — all native EnDat 01/EnDat 02; third-party drives (Siemens, Kollmorgen, etc.) need EnDat 01 master option — we can advise)
  • Hybrid cable selection​ (Rexroth hybrid cable for GDS02.1: RKGxxxx​ or RSGxxxx​ series — combines encoder power + EnDat 01 data + 1 Vpp incremental in one shielded cable; lengths 1m/3m/5m/10m/…/75m max. Must match your drive’s connector type: D-Sub 9/15/25 or M23)
  • Singleturn vs Multiturn decision​ (If your machine axis is a rotating spindle/short-travel linear → singleturn GDS02.1 (this one) is fine. If it’s a hoist/long-travel axis where absolute position across multiple revolutions must survive power loss → GDM02.1 (R911323380) is required)
  • Hollow shaft mounting​ (12mm shaft slides onto motor shaft; secured with radial grub screw (hex socket) on the encoder body; ensure 12mm shaft diameter + ≤±1mm axial float; torque grub screw to Rexroth spec ~1.5 Nm)
  • Rexroth IndraDrive parameterization​ (S-0-0028 / P-0-0001 encoder type = EnDat 01; S-0-0044 = 2048 increments; P-0-0005 = 8192 absolute positions; commission via IndraWorks software)
  • Alternative/replacement strategy​ (GDS02.1 is mature but still in production; if long-term obsolescence concern, Rexroth recommends migrating to ERS/ESM​ series absolute encoders — but that requires motor shaft modification. For drop-in spare → GDS02.1-2048-014V-H12,0 (R911323378) remains the correct choice.)
• Optional: Rexroth hybrid encoder cable (RKG/RSG series, 1–75m), IndraDrive (HCS01/02) for testing, EnDat 01 master evaluation board, 14V DC PSU for bench test, hollow-shaft mounting toolkit (grub screw hex key, torque wrench)

Delivery Time

• Standard delivery: 3-5 working days (stock NOS — GDS02.1 is still produced by Rexroth)
• Express shipping available upon request
• Note: Lead time from Rexroth Germany directly can be 6-10 weeks; we maintain NOS inventory for urgent replacement needs

Why Choose Our Store

• Genuine Bosch Rexroth GDS02.1-2048-014V-H12,0 (R911323378) — not gray-market (EnDat 01 ASIC calibration, 1 Vpp signal purity, hollow shaft 12mm tolerance critical — clones fail EnDat comm & cause servo instability)
• Global supply network with competitive pricing on Rexroth GDS/GDM/ERS/ESM encoder family
• Expertise in Rexroth servo feedback system (GDS02.1 decode, 748 882-09 nameplate ID cross-ref, singleturn vs multiturn GDM02.1 choice, EnDat 01 drive compatibility, 12mm hollow shaft fit verification, hybrid cable RKG/RSG selection, IndraDrive parameterization, GDS→ERS migration path)
• Comprehensive technical documentation (GDS02.1 dimensional drawing, flange socket pinout, hybrid cable cross-reference, IndraWorks encoder commissioning guide, GDS vs GDM vs ERS comparison)
• Responsive customer service and support

Applications

• Rexroth IndraDrive Servo Motor Feedback: Primary application — GDS02.1-2048-014V-H12,0 is the standard feedback encoder for Rexroth MKD/MHD/MSK/IndraDyn S-B​ servomotors with 12mm hollow shaft. Directly replaces failed encoder on existing motors without motor replacement — slide off old encoder, slide on new GDS02.1, secure grub screw, reconnect hybrid cable, re-commission via IndraWorks.
• Spindle / High-Speed Axis Feedback: 12,000 rpm mechanical speed rating + 2048 inc 1 Vpp incremental + 8192/rev absolute EnDat 01 → ideal for CNC spindle feedback, high-speed indexing, precision rotary tables. Absolute channel eliminates homing time; incremental channel provides smooth high-speed interpolation.
• Singleturn Absolute Positioning (within 1 rev): Rotary indexing tables, robotic joints (non-multi-rev), valve position feedback, printing cylinder registration — applications where absolute position within a single revolution is critical, but multi-revolution tracking is unnecessary. EnDat 01 provides instantaneous absolute read after power-up (no homing move required).
• Legacy Indramat DKC Drive Systems: Older Indramat DKC-series servo drives (still running in many 1990s–2000s machine tools) use GDS02.1 as the motor feedback encoder. This R911323378 is the current production replacement — 100% compatible with original DKC drive EnDat 01 interface. Extends the life of legacy machines without full drive retrofit.
• Machine Tool / CNC Retrofit Spare: Common spare part for milling machines, lathes, grinding machines using Rexroth IndraDrive + MKD/MHD motors. Stocked as critical spare for minimizing downtime — a failed encoder can stop a €500k machine; having a genuine R911323378 on the shelf means <30 minute swap vs. 6-10 week lead time from Rexroth.
• Third-Party Drive with EnDat 01: If your machine uses a non-Rexroth drive (Siemens SIMODRIVE, Kollmorgen AKD with EnDat option, etc.) that supports EnDat 01 absolute encoders, the GDS02.1 can be interfaced via the EnDat 01 master port + the 1 Vpp incremental inputs. Verify drive’s EnDat version (must be 01, not 02 — GDS02.1 is EnDat 01 only) before ordering.