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Y301-600/800/G00 Serial I/O Modules Technical Manual ​

Y301-600Y301-800Y301-G00
Y301-600 Product ImageY301-800 Product ImageY301-G00 Product Image

Contents ​

  1. Overview
  2. Default Settings
  3. Modbus Register Map
  4. Command Examples
  5. Parameter Configuration
  6. Troubleshooting

1. Overview ​

This manual explains the Modbus mapping and typical commissioning commands for the Y301-600, Y301-800, and Y301-G00 digital input modules.

ModelDIDOAIAO
Y301-6006000
Y301-8008000
Y301-G0016000

RTU frame format: [slave address][function code][data][CRC low][CRC high]

All commands in this document are shown in hexadecimal.

2. Default Settings ​

ParameterDefault
Slave address1
Broadcast address254
Baud rate9600 bps
Data bits8
ParityNone
Stop bits1
ProtocolModbus RTU (also compatible with Modbus ASCII)

3. Modbus Register Map ​

3.1 Discrete Inputs (DI) - Function Code 0x02 ​

ChannelPLC AddressPDU Address (0-based)Supported Models
DI11x00010x0000Y301-600/800/G00
DI21x00020x0001Y301-600/800/G00
DI31x00030x0002Y301-600/800/G00
DI41x00040x0003Y301-600/800/G00
DI51x00050x0004Y301-600/800/G00
DI61x00060x0005Y301-600/800/G00
DI71x00070x0006Y301-800/G00
DI81x00080x0007Y301-800/G00
DI91x00090x0008Y301-G00
DI101x00100x0009Y301-G00
DI111x00110x000AY301-G00
DI121x00120x000BY301-G00
DI131x00130x000CY301-G00
DI141x00140x000DY301-G00
DI151x00150x000EY301-G00
DI161x00160x000FY301-G00

Returned bit definition: 0 = inactive, 1 = active.

3.2 Holding Registers (Configuration Parameters) - Function Code 0x03/0x06 ​

ParameterPLC AddressPDU Address (0-based)Description
Communication baud rate4x10010x03E8Baud-rate code (see 3.3)
Reserved4x10020x03E9Reserved
Offset address4x10030x03EADevice address = offset address + DIP address
Operating mode4x10040x03EBUser data register
Delay time4x10050x03ECUser data register

3.3 Baud-Rate Code Table ​

CodeBaud Rate (bps)
09600
12400
24800
39600
419200
538400

4. Command Examples ​

4.1 Read All DI States by Model ​

ModelRequest (broadcast address FE)
Y301-600 (6DI)FE 02 00 00 00 06 EC 07
Y301-800 (8DI)FE 02 00 00 00 08 6D C3
Y301-G00 (16DI)FE 02 00 00 00 10 6D C9

Typical Y301-800 response:

text
Request:  FE 02 00 00 00 08 6D C3
Response: FE 02 01 01 50 5C

The third byte 01 is the byte count. The fourth byte 01 contains DI states; bit 0 is 1, so DI1 is active.

4.2 Read a Single DI Channel (DI1 Example) ​

text
Request:  01 02 00 00 00 01 B9 CA
Response: 01 02 01 [status byte] [CRC]

4.3 Read All DI States by Slave Address (0x01) ​

ModelRequest
Y301-60001 02 00 00 00 06 F8 08
Y301-80001 02 00 00 00 08 79 CC
Y301-G0001 02 00 00 00 10 79 C6

4.4 DI Status Byte Mapping ​

  • First status byte: bit0-bit7 map to DI1-DI8
  • Second status byte (16DI only): bit0-bit7 map to DI9-DI16

5. Parameter Configuration ​

5.1 Read and Write the Offset Address (4x1003) ​

Read the offset address:

text
Request:  01 03 03 EA 00 01 A5 BA
Response: 01 03 02 00 01 [CRC]    // example: current offset address = 1

Set the offset address to 5:

text
Request:  01 06 03 EA 00 05 68 79
Response: 01 06 03 EA 00 05 68 79

5.2 Read and Write the Baud Rate (4x1001) ​

Read the baud-rate code:

text
Request:  01 03 03 E8 00 01 04 7A
Response: 01 03 02 00 03 [CRC]    // example: code = 3

Set the baud-rate code to 4 (19200 bps):

text
Request:  01 06 03 E8 00 04 08 79
Response: 01 06 03 E8 00 04 08 79

After changing the baud rate, restart the device and update the host serial settings accordingly.

5.3 Addressing and Bus Recommendations ​

  1. Address 254 is the manufacturer's setup address, which receives responses. Use it with one device on the bus; it differs from standard Modbus broadcast address 0.
  2. In multi-drop networks, every device must use a unique slave address. Do not use the broadcast address for normal polling.
  3. Address 0 is not used for normal communication.

6. Troubleshooting ​

SymptomPossible CauseRecommendation
Cannot read DI statusAddress or baud rate mismatchVerify address, baud rate, and parity settings
No RS485 responseReversed A/B wiring or missing ground referenceCheck A/B polarity and common ground; add termination if needed
No RS232 responseSerial pinout mismatchVerify the TX/RX/GND connection against the host definition
Abnormal response on multi-drop busAddress conflict or use of broadcast pollingAssign a unique address to each device and disable broadcast polling

LED Indicator ​

LEDStatusMeaning
POWERSolid onPower is normal
  • Manufacturer: Hunan YenGear Tech Co., Ltd.
  • Address: Room 21014, Building 1, Fudi Xingguang Tiandi, Yingxin Road, Yuhua District, Changsha, Hunan, China
  • Email: [email protected]
  • Website: www.yengear.com