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136
Changes from Previous Products
Section 4-5
Response Wait Time After Host Computer Sends Data
When response wait time has been set in the command format from the host
computer, commands to the host computer will not be transmitted until the
response time has elapsed (1). Transmission of responses to commands from
the host computer will be postponed until the command transmission to the
host computer has been completed (2).
When a response is not required from the host computer, the Communica-
tions Port Enabled Flag will turn ON when the command to the host computer
has passed from the CPU Unit to the port.
4-4-5
Reception Buffers
In Host Link mode, each port has a reception buffer of 1,200 bytes. This is suf-
ficient to hold the maximum Host Link frame length for an FA command
response frame (1,115 bytes) + 85 bytes. If a frame larger than 1,200 bytes is
sent from the host computer (from @ to the carriage return), the frame will be
discarded and no response will be returned.
4-4-6
Error Responses
When Host Link FA commands are used for FINS commands, an error code
will returned as the end code in the FINS response whenever there is a mis-
take in the FINS command settings or an FINS response is required that is too
long for the legal response frame.
An end code of 110B Hex is returned when the response exceeds the maxi-
mum response length. The Host Link response frame will contain the
requested read data after the end code through the end of the maximum legal
response frame length.
Note
We recommend programming retry processing at any device sending com-
mands in case noise or other factors result in transmission errors.
4-5
Changes from Previous Products
There are differences between Host Link Systems created using the CS/CJ-
series Serial Communications Boards and Unit in comparison to Host Link
Response Required
Host computer
Command
Command
Response
Response
Serial Communications
Board/Unit
Communications Port Enabled Flag
Command acknowledged
Command completed
No Response Required
Host computer
Serial Communications
Board/Unit
Command
Command
Response
Communications Port Enabled Flag
Command acknowledged
Command completed
Response wait time
Response wait time
(1)
(2)
(1)
(2)
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...