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GSA-M Series Single Turn Modbus Absolute Encoder

GSA-M Series Single Turn Modbus Absolute Encoder

GSA-M Series Single Turn Modbus Absolute Encoder
  • GSA-M Series Single Turn Modbus Absolute Encoder

short description:

GSA-M Series encoder is a single turn bus-based Modbus absolute encoder, it can provide max 16bits sing-trun resolution, with options of housing Dia.:38,50,58mm; Solid/hollow Shaft Diameter:6,8,10mm, Output Code: Binary, Gray, Gray Excess, BCD; Supply Voltage:5v,8-29v;  MODBUS is a request/reply protocol and offers services specified by function codes. MODBUS function codes are elements of MODBUS request/reply PDUs. The objective of this document is to describe the function codes used within the framework of MODBUS transactions. MODBUS is an application layer messaging protocol for client/server communication between devices connected on different types of buses or networks.



Housing Diameter:38,50,58mm;

Solid/hollow Shaft Diameter:6,8,10mm;

Resolution:Max.16bits;

Supply Voltage:5v,8-29v;

Interface:Modbus

Output Code:Binary, Gray, Gray Excess, BCD


Product Detail

  1. Product Basic Specifications

SpecificationDetails
Product NameGSA-M Series Single Turn Modbus Absolute Encoder
Encoder TypeSingle Turn Absolute Encoder
ResolutionMaximum 16-bit per revolution
Housing Diameter38 mm / 50 mm / 58 mm
Solid/Hollow Shaft Diameter6 mm / 8 mm / 10 mm
Output CodeBinary, Gray, Gray Excess, BCD
Supply Voltage5V or 8–29V (some models support 5V)
InterfaceModbus (RS-485)

  1. Electrical Parameters

ParameterOpen CollectorVoltage OutputLine DriverPush Pull
Current Consumption≤80 mA≤80 mA≤150 mA≤80 mA
Load Current40 mA40 mA60 mA40 mA
Output High (VOH)≥ Vcc × 70%≥ Vcc – 2.5 V≥ 3.4 V≥ Vcc – 1.5 V
Output Low (VOL)≤ 0.4 V≤ 0.4 V≤ 0.4 V≤ 0.8 V
Supply Voltage8–29V (some models support 5V)8–29V (some models support 5V)8–29V (some models support 5V)8–29V (some models support 5V)
Maximum Frequency Response300 kHz300 kHz300 kHz300 kHz

  1. Mechanical Parameters

ParameterDetails
Starting Torque4×10⁻³ N·m
Maximum Shaft LoadingAxial: 29.4 N; Radial: 19.6 N
Maximum Rotational Speed3000 rpm
Weight160–200 g

  1. Environmental Parameters

ParameterDetails
Operating Temperature-30°C ~ 80°C
Storage Temperature-40°C ~ 80°C
Protection RatingIP54

  1. Communication and Modbus Protocol Parameters

ParameterDetails
Transmission InterfaceRS-485 (using shielded twisted pair, STP)
Device Address1–254 (default: 01)
Baud Rate4800, 9600 (default), 19200, 38400
Data Frame Format1 start bit, 8 data bits, 1 even parity bit, 1 stop bit; no flow control
Communication ProtocolModbus request/response protocol (based on function codes)

  1. Modbus Message Format

Command TypeMaster Request FormatSlave Response FormatExample
Read Position Value (CW 03H)Address | Command Code | Register Address | Data Length (word) | ChecksumAddress | Command Code | Byte Length | Parameter Data | ChecksumMaster: 01H 03H 00H 00H 00H 02H C4H 0BH; Slave: 01H 03H 04H 01H F4H 00H 01H 7BH FDH
Preset Current Position Value (CW 10H)Address | Command Code | Register Address | Data Length (word) | Byte Length (byte) | Parameter Data | ChecksumAddress | Command Code | Register Address | Data Length (word) | ChecksumMaster: 01H 10H 00H 4AH 00H 02H 04H 00H 00H 00H 00H 77H E0H; Slave: 01H 10H 00H 4AH 00H 02H 60H 1EH
Write Parameter Value (CW 06H)Address | Command Code | Register Address | Parameter Value | ChecksumAddress | Command Code | Register Address | Parameter Value | Checksum(a) Modify ID: Master: 01H 06H 00H 44H 00H 02H 48H 1EH; Slave: 02H 06H 00H 44H 00H 02H 48H 2DH; (b) Modify Baud Rate to 38400bps: Master/Slave: 01H 06H 00H 45H 00H 04H 99H DCH; (c) Modify Counting Direction (anticlockwise 01H): Master/Slave: 01H 06H 00H 46H 00H 01H A9H DFH

Note: The “|” symbol is used as a separator within each cell.

  1. Parameter Setting Details

Register/ParameterDescriptionData LengthRemarks
Register Address 0044HModify Device ID (Data Length: 0001H; high byte fixed at 00H, low byte is the new ID)1 byteFor example: change ID from 01H to 02H
Register Address 0045HSet Baud Rate (Data Length: 0001H; high byte fixed at 00H, low byte corresponds to the baud rate parameter)1 byteParameter values: 01H: 4800bps; 02H: 9600bps; 03H: 19200bps; 04H: 38400bps; 05H: 115200bps
Register Address 0046HSet Counting Direction (Data Length: 0001H; high byte fixed at 00H, low byte: 00H for clockwise (increasing), 01H for anticlockwise (decreasing))1 byteAfter modifying the counting direction, the current position must be preset
Register Address 004AHPreset Current Position Value (Data Length: 0002H; 4 bytes arranged from high to low; the preset value must not exceed the physical limit)4 bytesExample: Master sends: 01H 10H 00H 4AH 00H 02H 04H 00H 00H 00H 00H 77H E0H

  1. Selection and Ordering Guide

StepDescription
1If you have used encoders from other brands, please provide the brand and model information. Our engineers will recommend cost-effective alternatives.
2Choose the encoder type:
① Incremental Encoder
② Absolute Encoder
③ Draw Wire Sensor
④ Manual Pulse Generator
3Choose the output format or interface:
(For incremental encoders typically: NPN / PNP / Line Driver / Push Pull)
or communication interface: Parallel, SSI, BISS, Modbus, CANopen, Profibus, DeviceNET, Profinet, EtherCAT, Power Link, Modbus TCP
4Choose the encoder resolution:
Incremental encoders up to 50,000 ppr;
Absolute encoders up to 29-bit
5Choose the housing diameter and shaft diameter
Replacement Brand ExamplesOmron: E6A2-CS3C, E6A2-CS3E, E6A2-CS5C, E6A2-CW3C, E6A2-CW3E, E6A2-CW5C, E6A2-CWZ3C, E6A2-CWZ3E, E6A2-CWZ5C;
Koyo: TRD-MX, TRD-2E/1EH, TRD-2T, TRD-2TH, TRD-S, TRD-SH, TRD-N, TRD-NH, TRD-J, TRD-GK, TRD-CH Series;
Autonics: E30S, E40S, E40H, E50S, E50H, E60S, E60H Series

  1. Packaging Details and FAQ

ItemDetails
PackagingStandard export packaging, or customized as per buyer's requirement
Lead TimeDelivery usually within one week after full payment (using DHL or other logistics)
Payment MethodBank Transfer, Western Union, PayPal
Quality ControlProduct quality is strictly controlled by a professional inspection team with over 10 years of experience in the encoder industry (led by Mr. Hu)
Technical SupportThe technical team, led by Dr. Zhang, has achieved many breakthroughs in encoder development; in addition to standard incremental encoders, solutions for Profinet, EtherCAT, Modbus-TCP, Power Link, etc. are available
CertificationCE, ISO9001, RoHS (KC certification in process)
Inquiry ResponseAll inquiries will be responded to within 24 hours, and instant communication is available via WhatsApp or WeChat
Warranty Policy1-year warranty and lifetime technical support
Contact InformationTerry_Marketing@gertechsensors.com

  1. Other Information

ItemDetails
Applicable FieldsWidely used in automatic control and measurement systems in machinery manufacturing, shipping, textiles, printing, aviation, military test machines, elevators, etc.
Product FeaturesFeatures include vibration resistance, corrosion resistance, and pollution resistance.
Technical NotesFor detailed information regarding CRC checksum and data units in Modbus commands, please refer to the original technical documentation. Note that specific size data under the “Dimensions” section is not provided – please contact the manufacturer for details.
Replacement Brand InformationGertech products are popular alternatives for many international brands such as Sick, Heidenhain, Nemicon, Autonics, Koyo, Omron, Baumer, Tamagawa, Hengstler, Trelectronic, Pepperl+Fuchs, Elco, Kuebler, etc.
Company and Support InformationOur professional quality control and technical support teams provide comprehensive pre-sales, in-sales, and after-sales services. Products come with a 1-year warranty and lifetime technical support, and are continuously certified through CE, ISO9001, RoHS, and KC (in process).


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