Absolute Rotary Encoder GDS60—SBB (binary code)

  • A “photoelectric detection mode”, with excellent impact and vibration resistance.
  • Wide operating voltage, low current consumption.
  • Clamping flange, servo flange or blind hollow shaft, the international standard structure.


Absolute Rotary Encoder GDS60—SBB User Manual (binary code)


★Please totally read the following instruction first for proper use of encoder.

Mechanical spec. Electrical spec.
Max. speed 6000 RPM Power supply 10-30Vdc (5Vdc optional)
Shaft load Axial 40N, radial 100N Current consumption < 50mA (24Vdc)no-load
impact 1000m/s²(6ms),about 100g output 18-bit SSI synchronous serial signal (binary)
Anti-vibration 200m/s²(10-2000Hz) about 20g resolution 1/262144FS
Allow axial jump ±1.5mm IP IP65或IP68
Allow radial jump ±0.2mm accuracy 0.01º
structure 60mm outer diameter, solid shaft, or hollow shaft Operating temp. -40℃~100℃
Connection Type 6-core shielded cable or aviation connector Storage temp. -40℃~85℃
Reliable and patented

  • Rugged bearing structure with safety lock design provides higher anti-vibration and anti-installation error
  • IP68 protection grade and wide working temperature range -40℃…+85℃
  • With permanent power-off memory function
Performance optimization

  • High precision, data refresh rate of position data≤4us
  • High-resolution feedback via RS422
  • The control period is short. Clock frequency up to 1MHz
  • International standard SSI signal format

Output Interface: ( Refer to product manual)

Wire Signal DIR — rotation direction. When the core wire is low, top view of the shaft clockwise to incrGDSe data. When working power plus high, change of direction is counterclockwise to incrGDSe data;

MID P — Zero point positioning. When the core wire with high level short contact , the current position data output is the zero point of the whole data ; When working properly, it should connected to 0V.

Clock/Data-— four- wire RS422 mode, ± 5V, one pair of clock trigger, a pair of data output.

Brown 10-30Vdc or 5V
White 0V GND
Blue DIR
Black MID P
Green CLOCK+
Yellow CLOCK-
Gray DATA+
Pink DATA-

SSI protocol description:

SSI SSI is a synchronous serial signal, two pairs of RS422, one pair of clock trigger, a pair of data transmission.

As shown, the absolute position value of the encoder is triggered by clock signal of the receiving device, from the high bit of Gray code(MSB),output serial signal synchronized with clock signal. The clock signal sent from the receiving device, refer to the total number bits of the encoder, output N interrupt pulse. When the signal is not transmitted, the clock and data bits are high, at the first falling edge of the clock signal, storing the current value, from the rising edge of the clock signal, sending data signal, A clock pulse synchronization a data.

Wherein: t3 is the restore signal, waiting for the next transmission; N = 13; 16; 25; 28. (Total number of digits according to the encoder)

T = 4-11us; t1 = 1-5.5us; t2 ≤ 1us; t3 = 64us (Clock-and Date-omit not shown).

In actual use, in order to ensure the stability of the signal with the transmission distance farther, recommended the following parameters:

T = 8us (125KHz); t1 = 4us; t2 (the actual reading latency = 3 ~ 4us); t3 = 64us

Data processing:

The encoder output is a binary code that is decoded from a high bit into a binary code. In order to avoid abrupt change of working stroke data, it is recommended to use the middle position of the encoder data value as the starting position. When the encoder is installed, rotate it to the actual work start point, shorten the MIDP line of the encoder cable core to the power supply , The current signal output is the zero value of the total output value of the encoder, and the MIDP line returns to the power supply 0. After receiving the current mGDSured value into a binary code, should do the following:

The received binary code into an integer can be calculated directly.


Encoder is a precision instrument, do not knock, bump or drop encoders, especially in the shaft end, plGDSe gently, with care.

Guarantee encoder power supply in the range of 10 ~ 30Vdc and good isolation, to prevent large-scale activation of the electrical grid and the impact of the encoder.

In strong electromagnetic interference in the environment, to extend the signal lines should use the recommended special lines, such as right angle shielded cable.

Encoder signal lines should be done well grounded: close within two meters, the cable inside the shield should be grounded at both ends; greater distance, grounded metal enclosure encoder, the encoder comes with shielded cable shield unconnected, signal extension cable shielding receiving end single-grounded; if the signal cable longer or outdoor use, should signal cable sleeve metallic iron pipes and metal pipes grounded at its ends.

SSI signal line is band voltage, the signal should be used to prevent short-circuiting or short-circuited the power supply; prohibit hot plug, ensure that the cable is energized each wire on simultaneously. Encoder must be powered down no static soldering or connection, or connect the 0V line before welding; cable, do not pull the cable violently.

Encoder protection class IP65, waterproof to use, but the encoder shaft at the Do not flooded.

Encoder shaft and mechanical connections should use a dedicated flexible coupling.

Installation dimensions (Unit: mm)

  1. Clamping & synchro flange(default)

b.Synchro flange

  1. Hollow shaft





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