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15
Features
Section 1-4
immediately after the send operation is completed. Therefore, if there was a
rapid response from the remote device, for example, the data received
between data sending and the completion of the send operation could not be
accessed as receive data by the next receive operation.
Support for the full-duplex transmissions enables all the data received in a
sequence to be accessed. Data can also be received from a remote device
while sending.
Note
Full-duplex transmissions can be used with either RS-232C or RS-422A/485
as long as 1:1, 4-wire connections are used. Full-duplex transmissions cannot
be used with 1:N connections or 2-wire connections.
Clear Reception Buffer at
Any Time
With full-duplex mode, the reception buffer is cleared only immediately before
a communications sequence is executed. When a reception or other fault
occurs, the receive data can be cleared at any time using the reception buffer
clear (FLUSH) command.
Control ER Signal at Any
Time
With a connection to a modem, the ER signal is used to show the communica-
tions enabled status of a Serial Communications Board or Unit (Data Terminal
Equipment (DTE)). In conventional operations, the ER signal could be turned
ON only while a communications sequence was being executed.
Improving this function has enabled the ER signal to be turned ON or OFF at
any time during a communications sequence. This enables modem connec-
tions and disconnections to be performed by a protocol macro.
The ER signal can also be kept ON, even after a communications sequence
has been completed. In this case, the ER signal remains ON, even after it has
been switched to a different serial communications mode (for example, Host
Link). This function enables remote programming and monitoring to be per-
formed using remote Programming Devices, by switching to the Host Link
mode with the STUP(237) instruction once the connection has been made
with the modem.
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...