Absolute Rotary Encoder EAS38—SGB (binary code)

* Absolute digital encoder disk, high-precision digital, no signal interference and zero drift in fear.

* SSI digital output, the fastest clock frequency can be set to 1MHz, high-speed, high-precision control

* 16384 resolution per revolution, 1 parity bit

* Wide operating voltage, low current consumption

* Clamping flange or synchro flange, the international standard shape structure


Absolute Rotary Encoder EAS38—SGB User Manual (binary code)


Operating voltage 10 … 30Vdc or 5V dc polarity protection
Consumo actual <110mA (24Vdc) <190mA (12Vdc)
Output signal SSI synchronous serial signal (binary code)
Output load capacity ≤400Ω, 200-250Ω standard
Linear Resolution 1/4096FS or 1/16384FS
Working temperature -20 ~ 75 ℃
Storage temperature -40 ~ 100 ℃
Protection class IP65
Vibration and shock 10g, 10 ~ 2000Hz; 100g, 6ms
Allowed speed 2400 rev / min
Connection cable 1 m shielded cable radial side (rest form can be ordered)
Shape characteristics Metal shell, sealed double bearing

Output Interface: ( Refer to product manual)

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

marrón 10-30Vdc or 5V
Blanco 0V GND
Blue DIR
Negro MID P
Verde CLOCK+
Amarillo CLOCK-
Gray DATA+
Pink DATA-

SSI protocol description:

1 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 = 11-15.5us (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 = 15us

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 measured 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, please 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)

Clamping flange (default)

Synchronous flange

Blind hole



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