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Appendix A: Serial Ports ..................................................................................53
A.1 RS-232 and RS-422 Pin Assignments....................................................53
A.2 Connecting to Computers—RS-232 Connections ..............................54
A.2.1 RS-232 Connections to IBM PCs and Compatibles ..................54
A.2.2 RS-232 Connectors to IBM AT and compatibles ......................55
A.3 Connecting to Printers .........................................................................56
A.4 Connecting to Modems........................................................................57
A.5 Connecting to Plotters..........................................................................58
A.6 Connecting to NEC Spinwriter ............................................................59
A.7 Connecting to DEC LN03 Laser Printer .............................................60
A.8 RS-422 Cables........................................................................................61
Appendix B: Parallel Ports ...............................................................................62
B.1 Parallel Pin Assignments ......................................................................62
B.2 Cable for IBM PC/XT, AT, or compatible..........................................64
B.3 Cable to a 36-pin Amphenol ................................................................64
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7. Serial Port Control Utility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
8. Using the Modular Smart Switch to Transfer Files . . . . . . . . . . . . . . . . . .40
8.1 Transferring Files between IBM compatible PCs . . . . . . . . . . . . . . . .40
8.2 Using the Software with File-Transfer Software . . . . . . . . . . . . . . . . .42
8.3 Transferring Files Between PCs Not Compatible
with IBM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
8.4 General Hints and Tips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
9. Software Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
9.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
9.2 Connect Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
9.2.1 Selecting a Destination Port . . . . . . . . . . . . . . . . . . . . . . . . . . .45
9.2.2 Printing Several Copies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
9.2.3 Broadcasting Data to Several Devices . . . . . . . . . . . . . . . . . . . .45
9.2.4 Varying the Timeout Period . . . . . . . . . . . . . . . . . . . . . . . . . . .46
9.2.5 Disabling Software Commands . . . . . . . . . . . . . . . . . . . . . . . . .46
9.2.6 Removing Line Feeds at End of Software
Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
9.3 Clear Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
9.4 End of File Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
9.5 Creating Batch Files to Send Commands (IBM
compatible PCs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
9.6 Setting Default Start of Day Destination Ports . . . . . . . . . . . . . . . . . .49
10. Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
10.1 Self-Test at Power-On . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
10.2 Parallel Interfaces—No Data Transmitted through the
Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
10.3 Parallel Interfaces—Corrupted, Extra, or Lost Data . . . . . . . . . . . .51
10.4 Problems Interfacing Serial Devices . . . . . . . . . . . . . . . . . . . . . . . . .51
10.5 Serial Interfaces—No Data Transmitted through the
Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
10.6 Serial Interfaces—Corrupted Data . . . . . . . . . . . . . . . . . . . . . . . . . .51
10.7 Merged Printouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
10.8 Print Data Transmitted but File Transfer Fails . . . . . . . . . . . . . . . .52
