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GMA-M Series Modbus Bus-based Multi-Turn Absolute Encoder

GMA-M Series encoder is a Multi-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.

Certificates: CE,ROHS,KC,ISO9001

Leading time: Within a week after full payment; Delivery by DHL or other as per discussed;

▶Housing Diameter:38,50,58mm;

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

▶Interface: Modbus;

▶Resolution: Max.16bits, Single turn max.16bits, Total Max.29bits;

▶Supply Voltage:5v,8-29v;

▶Output Code: Binary, Gray, Gray Excess, BCD;

▶Widely used in various fields of automatic control and measurement system,such as machinery manufacturing, shipping, textile, printing, aviation, military industry Testing machine, elevator, etc.

▶Vibration-resistant, corrosion-resistant, pollution-resistant;

Main Introduction

♦ Transmission Interface：RS-485. Add：1～254.（Default to be 01）

♦ Baud Rate：4800，9600（Default），19200，38400. Communication

♦ Medium：STP.

♦ Date Frame Format：1 start bit，8 Data bit，1 Even Parity bit, 1 stop bit，Non-control flow.

Message Format:

1.Command word(CW) 03H：Read Location Value

Master Request(MASTRQ)：Address | Command Word | Parameter Address | Data Length | Check Code

Slave Response：Address | Command Word | Byte Length | Parameter Values | Check Code

2.Command word(CW) 10H：Preset Current Position Value

Master Request(MASTRQ)：Address | Command Word | Parameter Address | Data Length | Byte Length | Parameter Values | Check Code

Slave Response：Address | Command Word | Parameter Address | Data Length | Check Code

3.Command word(CW) 06H：Write Parameter Value

Master Request(MASTRQ)：Address | Command Word | Parameter Address | Parameter Value| Check Code

Slave Response：Address | Command Word | Parameter Address | Parameter Value | Check Code

Read Location Value：

Master Query Location Value：01H 03H 00H 00H 00H 02H C4H 0BH

Note：01H-Adress | 03H-Command Word | 00H 00H-Register Address | 0H 02H-Data Length（Unit:Word）| C4H 0BH- CRC Check

Slave Response： 01H 03H 04H 01H F4H 00H 01H 7BH FDH

Note：01H-Adress | 03H-Command Word | 04H Data Length（Unit: Byte）| 01H F4H 00H 01H-Location Data | 7BH FDH- CRC Check

Parameter Setting (Take effect after re power up)：

Parameter Sheet：

Note 1).Register Address 0044H, Length 0001H, Data High Byte Fixed to be 00H，Low Byte to be Changed ID；

(2).Register Address 0045H, Length 0001H, Data High Byte Fixed to be 00H，Low Byte to be Baud Rate；

(3).Register Address 0046H, Length 0001H, Data High Byte Fixed to be 00H，Low Byte be Counting Direction;

(4).Register Address 004AH, Length 0002H, Four bytes from High to low be Current preset Location Value（Note not to Exceed physical position limit）；

Parameter Changing Example：

a . Change ID（01H à 02H）：

Master Send：01H 06H 00H 44H 00H 02H 48H 1EH

Slave Response：02H 06H 00H 44H 00H 02H 48H 2DH

Note：01H-address | 06H-command word | 00H 44H-Rigester Address | 00H 02H-Data | 48H 1EH-CRC Check(48H 2DH-CRC Check)

b. Change Baud Rate (BR change to be 04H-38400bps)：

Master Send：01H 06H 00H 45H 00H 04H 99H DCH

Slave Response：01H 06H 00H 45H 00H 04H 99H DCH

Note：01H-Address|06H-Command Word|00H 45H-Register Address|00H 04H-Data|99H DCH- CRC Check

c．Change Counting Direction (Counting Direction 01H-Anti-clockwise，Current Location Value Must Be set After Change)

Master send：01H 06H 00H 46H 00H 01H A9H DFH

Slave Response：01H 06H 00H 46H 00H 01H A9H DFH

Note：01H-address|06H-command word|00H 46H-Register Address|00H 01H-Data|A9H DFH- CRC Check

d. Set Current Position Value(current position Value change to be 00000000H)

Master Send：01H 10H 00H 4AH 00H 02H 04H 00H 00H 00H 00H 77H E0H

Note：01H-address|10H-command word|00H 4AH-register address|00H 02H-data length（Unit:Word）|04H-Data Length（Unit:Byte）|00H 00H 00H 00H-Data|77H

B5H- CRC Check

Slave Response：01H 10H 00H 4AH 00H 02H 60H 1EH

Note：01H-address|10H-command word|00H 4AH-register address|00H 02H-data length（Unit:Word）A0H DCH-CRC ChecL

Five steps let you know how to select your encoder:
1.If you’ve already used encoders with other brands, plz feel free to send us the information of the brand info and encoder info, like model no, etc, our engineer will advise you with our euqivalent replacement at a high cost performance;
2.If you want to find an encoder for your application, plz first select encoder type: 1) Incremental encoder 2) Absolute encoder 3) Draw Wire Sensors 4) Manual Pluse Generator
3. Choose your output format(NPN/PNP/LINE DRIVER/PUSH PULL for incremental encoder) or interfaces(Parallel, SSI, BISS, Modbus, CANopen, Profibus, DeviceNET, Profinet, EtherCAT, Power Link, Modbus TCP);
4. Select the resolution of the encoder, Max.50000ppr for Gertech incremental encoder, Max.29bits for Gertech Absolute Encoder;
5. Select the housing Dia and shaft dia. of the encoder;
Gertech is popular equivalent replacement for similar foreign products such as Sick/Heidenhain/Nemicon/Autonics/ Koyo/Omron/Baumer /Tamagawa/Hengstler /Trelectronic/Pepperl+Fuchs/Elco/Kuebler ,ETC.

Gertech Equivalent replace:
Omron:
E6A2-CS3C, E6A2-CS3E, E6A2-CS5C, E6A2-CS5C,
E6A2-CW3C, E6A2-CW3E, E6A2-CW5C, E6A2-CWZ3C,
E6A2-CWZ3E, E6A2-CWZ5C; E6B2-CS3C, E6B2-CS3E, E6B2-CS5C, E6A2-CS5C,E6B2-CW3C, E6B2-CW3E, E6B2-CW5C, E6B2-CWZ3C,
E6B2-CWZ3E, E6B2-CBZ5C; E6C2-CS3C, E6C2-CS3E, E6C2-CS5C, E6C2-CS5C,E6C2-CW3C, E6C2-CW3E, E6C2-CW5C, E6C2-CWZ3C,
E6C2-CWZ3E, E6C2-CBZ5C;
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

Packaging Details
The rotary encoder is packed in standard export packaging or as required by buyers;

FAQ:
1) How to select an encoder?
Before ordering encoders, you could clearly know which type of encoder you may need.
There are incremental encoder and absolute encoder, after this, our sale-service department would better work for you.
2) What specifications are requested before order an encoder?
Encoder type—————-solid shaft or hollow shaft encoder
External Diameter———-Min 25mm, MAX 100mm
Shaft Diameter—————Min shaft 4mm, Max shaft 45mm
Phase & Resolution———Min 20ppr, MAX 65536ppr
Circuit Output Mode——-you could choose NPN,PNP,Voltage, Push-pull,Line driver, etc
Power Supply Voltage——DC5V-30V
3) How to choose a right encoder by yourself ?
Exact Specification Description
Check The Installation Dimensions
Contact Supplier to get more details
4) How many pieces to start ?
 The MOQ is 20pcs .Less quantity is also ok but the freight  is  higher.
5) Why choose “Gertech” Brand Encoder?
All encoders are designed and developed by our own engineer team since year 2004,and most of the electronic component of encoders are imported from overseas market. We own the Anti-static and no-dust workshopand our products pass the ISO9001. Never let our quality down,because quality is our culture.
6) How long is your lead time?
Short lead time—-3 days for samples,7-10days for mass production
7) what is your guarantee policy?
1year warranty and life-long technical support
8)What are the benefit if we become your agency ?
Special prices, Market protection and supporting.
9)What is the process to become Gertech agency?
Please send us enquiry,we will contact you as soon as possible.
10)What is your production capacity?
We produce 5000pcs every week.Now we are building second phrase production line.