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26
Specifications
Section 1-6
1-6-3
Protocol Specifications
Host Link Specifications
Note
1.
Confirm the baud rates and communications distance supported by con-
nected devices.
2.
The maximum cable length for RS-232C is 15 m. The RS-232C standard,
however, does not cover baud rates above 19.2 Kbps. Refer to the manual
for the device being connected to confirm support.
Item
Description
Communications mode
Half-duplex (Full-duplex for slave-initiated communications)
Synchronous mode
Start-stop synchronization (asynchronous mode)
Baud rate (see note 1)
RS-232C port and RS-422A/485 ports:
1,200/2,400/4,800/9,600/19,200/38,400/57,600/115,200 bps
Default setting: 9,600 bps
Communications
distance (see note 1)
RS-232C port: 15 m max. (see note 2)
RS-442A/485 port: 500 m max. (The total combined cable length is 500 m max. T-branch lines
must be a maximum of 10 m long.)
Connection
configuration
RS-232C port: 1:1 (1:N (N = 32 Units max.) is possible using an Converting Link Adapters.)
RS-422A/485 port: 1:N (N = 32 Units max.)
Number of connected
Units
32 Units max. (unit numbers 0 to 31; unit number 0 is set for 1:1 connection)
Frame structure
C-mode
commands
Header: @, address: (host link unit number) 0 to 31 (BCD), data: header
code + text, error check code: FCS, terminator: *+CR
FINS
commands
Header: @, address: (host link unit number) 0 to 31 (BCD), data: header
code (always “FA”) + FINS FINS c text, error check
code: FCS, terminator: *+CR
Error check codes
Vertical parity: Even, odd. or none
FCS (horizontal parity converted to ASCII)
Command flow and
support
Command flow
Commands
Contents
Host computer
to PLC
C-mode commands
1:1 or 1:N communications with directly connected
PLCs (The specified frame format must be prepared
on the host computer and then sent.)
FINS commands (in
Host Link protocol)
1:1 or 1:N communications with directly connected
PLCs.
PLC to host
computer
FINS commands (in
Host Link protocol)
Communications using SEND(090), RECV(098),
and CMND(490) from CPU Unit.
The host computer must interpret the commands
and return a response in the correct format.
Connection between the host computer and PLC
must be 1:1.
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...