Absolute Encoder EAS38—V1 User Manual
|Operating Voltage||18-26Vdc polarity protection|
|Current Consumption||< 110mA (24V power supply) no load|
|Output Signal||RS485 and 0-5V dual independent output, you can set the length, angle, speed application output|
|Output load capacity||≤ 400 ohms, the standard 200-250 Ohm work|
|Operating Temperature||-20—75℃ Programming temperature range：0℃～＋70℃|
|Temperatura de almacenamiento||-40—80℃|
|Protection class||IP67 for housing IP65 for shaft|
|Vibration & shock||20g，10～2000Hz；100g，6ms|
|Permissible Rotation Rate||2400rpm|
|Output refresh cycle||<1.4ms|
|Connection Cable||1m 8-core shielded cable.|
|Overall Feature||Clamping flange or synchronous flange, metal enclosure, sealed dual-bearing structure ( see attached drawing of overall dimension)|
|Signal Conditioning||Can 0V output trim, 5V output trim; direction can be set; preset position, external set, such as external zero|
|signal||Vcc||GND||RS485 UNA||RS485 si||0-5V+||0-5V-||Reset||Permit|
Example (output signal evolution)
Installation dimensions (Unit: mm)
Clamping flange (default)
Custom RS485 communication protocol description:
Baud Rate: 4800bps 9600bps 19200bps 38400bps 115200bps.
Frame format: 8 data bits, 1 stop bit, no parity, no flow control.
The parameter of encoders is set by software instruction.
When the encoder is in active mode, That is the encoder automatically sends data to the host. Data length is 16 hexadecimal ASCII code format is: XAB> ± DATA ↙, as follow:
Wherein, “X” is the leading letters,”>” is delimiters, “±” is the sign bit; “DATA” is the data, ASCII format, 10, from 0 to 9 constitute the range of -9,999,999,999 ~ +9,999,999,999. “↙” is carriage return (0D).
When the encoder is in passive mode, That is quiz mode. Host send inquiry instruction to the encoder, the instruction is four hexadecimal ASCII code format is: D + AB ↙.
“AB” is encoder address, range is 0~99.
1: Read data:
Host send: D + address + 0D
Encoder reply: X + address +> + match bit + data bit + 0D
Host send: 44 30 31 0D (when the encoder address is 01)
Encoder back: 58 30 31 3E 2B 30 30 30 30 30 30 30 31 32 33 0D
2: Encoder reset command:
Host send: D + address + L + M + sum check + 0D
Encoder reply: X + address + l + m + sum check + 0D
Host send: 44 30 31 4C 4D sum check 0D (when the encoder address is 01)
Encoder reply: 58 30 31 6C 4D sum check 0D (reset current position)
Sum check: The sum of all the previous data, take the lower two digits as the check value
For encoder parameter setting (ex. 0-5V corresponding value), please use our company’s special CALT software.
1. Data direction
Clockwise: Encoder data increases when the encoder rotates clockwise facing the encoder shaft.
Counterclockwise: Encoder data increases when the encoder rotates counterclockwise facing the encoder shaft.
2. Master/slave mode:
Master mode is broadcast
Slave mode is question and answer mode
3. Baud rate:
Setting range: 4800 —- 115200
4. Resolution: The data output by the encoder in one revolution
1–4096 can be set
5. Encoder address:
Setting range: 0–99
6. Reset value:
a. When the reset line (gray) connected to power+ for more than 1 second, the current value of the encoder becomes the reset value.
b. When sending a reset command to the encoder, the current value of the encoder becomes the reset value. (Instance 2)
7. Set the min. analog value:
Must be less than the maximum analog value, generally set to 0
8. Set the max. analog value:
Must be less than or equal to the encoder resolution (depending on the actual situation)
9. Minimum / maximum analog calibration:
These two parameters have been calibrated before leaving the factory, and generally do not need to be used. If the minimum or maximum analog value is inaccurate, please increase the number accordingly and click to confirm.
Read parameters: That is to read the original parameters of the encoder
Save: Write the currently modified parameters to the encoder.
Export parameters: Store the parameter that has just been set to the place specified by the computer. In order to import the storage parameters directly in the future.
Import parameters: Import the previously exported parameters into the software and use them.
RS485 communication considerations:
1. Communication speed and transmission distance is a contradiction. The higher the rate, the transmission distance is shorter, but more stable, and vice versa.
2. External reset line (gray wire) used to reset the encoder current position to presetting value. When using, the gray wire should connected to high level (24V). But after the completion of the operation, It’s better to connect gray wire to power ground to avoid interference.
3. In the strong external electromagnetic interference, RS485 connection is best to use double-shielded cable.
4. When multiple encoders connect host, because of the encoder have no parity, it is suggested that when the PC programming in time to distinguish between the various encoder data returned.
5. When the system has a motor, encoder power supply should be isolated from other.
Since RS485 circuit is a differential form, A, B are two signal lines with voltage, often times connect to ground or high level, RS485 circuit will cause damage.
Shanghai QIYI Electrical & Mechanical Equipment Co., Ltd