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Executing Loopback Tests
Section 10-1
10-1 Executing Loopback Tests
10-1-1 Overview
Executing a loopback test will allow you to test a port communications circuit
by connecting a loopback-wire connector to the port of a Serial Communica-
tions Board or Unit, looping back the transmitted data to make it the received
data for the Unit or Board, and then comparing and checking the data.
10-1-2 Connection Method
Make the connections according to the type of port, as shown in the following
diagrams.
RS-232C Port
RS-422A/485 Port
10-1-3 Procedure
The loopback test is performed using the procedure shown below.
1,2,3...
1.
Connect the connector of the port to be used to execute the loopback test.
See
for details.
2.
Set the serial communications mode in the Setup Area to Loopback Test
(F Hex). Refer to
.
3.
Set the following communications settings for the loopback test in the Set-
up Area: Baud rate, stop bits, parity, and data length. Refer to
.
4.
Cycle the power, restart the Unit or Board, or restart the port.
Use the following bits to restart the Board or Unit.
Board:
A60800
Units:
A501, bits 00 to 15 (bits correspond to unit numbers 0 to F)
Use the following bits to restart the port.
Board:
A636, bit 01 for port 1 and bit 02 for port 2
Units:
A620 + unit number, bit 01 for port 1 and bit 02 for port 2
Loopback test
Loopback test switch
Serial Communications Unit
(CS/CJ Series)
Pin
Signal
2
3
4
5
1
8
7
SD
RD
RTS
CTS
FG
DTR
DSR
Pin
Signal
1
2
6
8
SDA
SDB
RDA
RDB
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...