34
Specifications
Section 1-6
Modbus-RTU Specifications
Note
Modbus-ASCII mode is not supported.
Supported Commands
Item
Description
Mode
Modbus-RTU slave mode (See note.)
Baud rate
1,200/2,400/4,800/9,600/19,200/38,400/57,600/115,200 bps
Default: 19,200 bps
Data length
8 bits
Parity
Odd, even, or none
Default: Even
Stop bits
Odd or even parity:1 bit
No parity: 2 bits
Address setting
range
1 to 247 (broadcasting: 0)
Frame format
Slave address: 1 byte
Function code: 1 byte
Data: 0 to 252 bytes
CRC code: 2 bytes
Function code
(hexadecimal)
Function
Modbus name
01
Reads multiple bits from the CIO, Work,
Holding, or Auxiliary Area of I/O memory.
Read Coils
02
Reads multiple bits from the CIO Area of
I/O memory.
Read Discrete Inputs
03
Reads multiple words from the DM or EM
Area of I/O memory.
Read Holding Registers
04
Reads multiple words from the CIO,
Work, Holding, or Auxiliary Area of I/O
memory.
Read Input Registers
05
Writes a bit in I/O memory.
Write Single Coil
06
Writes a word in the DM or EM Area of
I/O memory.
Write Single Register
08
Executes an echoback test.
Diagnostic
0F
Writes multiple bits in I/O memory.
Write Multiple Coils
10
Writes multiple words in the DM or EM
Area of I/O memory.
Write Multiple Registers
Summary of Contents for SYSMAC CJ1W-SCU21-V1
Page 3: ...iv...
Page 5: ...vi...
Page 9: ...x...
Page 15: ...xvi...
Page 89: ...60 Basic Operating Procedure Section 1 9...
Page 151: ...122 RS 232C and RS 422A 485 Wiring Section 3 4...
Page 173: ...144 Host Link Function for Replacing Existing PLCs Section 4 6...
Page 223: ...194 Enhanced Protocol Macro Functions Section 5 6...
Page 277: ...248 Communications Frames Section 6 8...
Page 291: ...262 Basic Operating Procedure in No protocol Mode Section 7 4...
Page 301: ...272 Auxiliary Area and CIO Area Allocations Section 8 3...
Page 391: ...362 Introduction Appendix A...
Page 421: ...392 CompoWay F Master Protocol Appendix B...
Page 513: ...484 E5 K Digital Controller Read Protocol Appendix F...
Page 571: ...542 E5ZE Temperature Controller Write Protocol Appendix I...
Page 587: ...558 E5 J Temperature Controller Protocol Appendix J...
Page 627: ...598 ES100 Digital Controller Protocol Appendix K...
Page 661: ...632 V500 V520 Bar Code Reader Protocol Appendix M...
Page 697: ...668 3Z4L Laser Micrometer Protocol Appendix N...
Page 717: ...688 Visual Inspection System Protocol Appendix O...
Page 755: ...726 V600 V620 ID Controller Protocol Appendix P...
Page 763: ...734 Hayes Modem AT Command Protocol Appendix Q...
Page 767: ...738 Changing Communications Port Settings Using STUP 237 Appendix R...
Page 781: ...752 Revision History...