DIAG.TXT  - Serial Diagnostic Programs

Serial Utility Diskette 1997

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If you have any questions or comments concerning these diagnostic programs,
please contact technical support at the numbers listed in the README.TXT file
in the root directory of this diskette. This document is organized with the
following conventions:

Section 1. Serial Diagnostic Menu Driven Test Program (SSD.EXE)
Section 2. Serial Loopback Test (SLT.EXE)

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Section 1. Serial Diagnostic Menu Driven Test Program (SSD.EXE)

SSD is a diagnostic program for UART based products which use 16550,
16450 or 8250 compatible UARTs. The syntax for invoking the program is:

	  SSD /b:### - where ### is the base address of the UART in hex.

ex. - test COM1 => Syntax: SSD /b:3F8
    - test COM2 => Syntax: SSD /b:2F8

    - test a UART at 2E0 hex => Syntax: SSD /b:2E0

The procedures provided are as follows:

1) Verify address and examine UART - Confirms the presence of a UART at
   the specified address and displays the configuration of the device
   when the test was started.

* Note: The following loopback tests use ASCII characters for checking
  transmit / receive data continuity.  If 5 or 6 bit word length is
  selected, these tests will fail due to the lack of bits in the data.

2) Internal UART loopback test - Places the UART in a diagnostic loopback
   mode.  Data transmitted is immediately received.

   External loopback test - A loopback plug is required for this test:

		 RS - 422                    RS - 232
	      ----------------            ---------------
	      TX(+) -> RX(+)              TD -> RD
	      TX(-) -> RX(-)              RTS -> CTS -> RI
	      RTS(+) -> CTS(+)            DTR -> DSR -> DCD
	      RTS(-) -> CTS(-)
	      DTR(+) -> DSR(+)
	      DTR(-) -> DSR(-)

   Data is transmitted and received through the RS-232 or RS-422 drivers.
   The modem control signals are tested for continuity.  Loopback connectors
   for this test are available from technical support.

3) IRQ test - Generates an interrupt and indicates which interrupt request
   line has been detected.  

4) Examine modem control signals - Allows control over RTS and DTR and displays
   the status of the other modem control signals (RI,CTS,DCD,DSR).

5) Terminal mode - A) Places the PC into a terminal emulation mode.  All
   characters typed on the keyboard are transmitted through the UART.  Received
   data is displayed in ASCII format.
		   B) Transmits a continuous data stream through the UART for
   troubleshooting purposes.  Pressing any key toggles the stream on and off.
   The IRQ line is active at this time and its transitions can be observed.

6) Show current system COM: and LPT: settings. 

7) Test setup - This selection will allow the UART test parameters to be 
   modified. 

8) Initialize UART - This selection will configure various settings for
   this program.	

9) Exit to DOS - Restores the original state of the UART and exits the program.

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Section 2. Serial Loopback Test Program (SLT.EXE)

1)  Command Line Syntax.

	   C:>SLT /b:xxx /i:y
    Where xxx is the base address of the port and y is the IRQ selected. The
    program will test the port at 19.2Kbps N,8,1. The test program is
    interrupt driven and requires a loopback plug (see below).

	    Address Range:  0-FFFF Hex
	    IRQ Range:      2-15 Decimal   (XT and AT IRQs)

2)  Examples:

	      C:>SLT /b:3F8 /i:4 <ENTER>
		    This will test COM1:
	      C:>SLT /b:2F8 /i:3 <ENTER>
		    This will test COM2:
	      C:>SLT /b:300 /i:15 <ENTER>
		    This will test address 300 hex and IRQ15.


3)  Loopback: RS-232         loop TX to RX
	      RS-422/485/530 loop TX+ to RX+ AND TX- to RX-

4)  Notes:

    IRQ2 on "AT" class machines is not available.  IRQ9 is substituted 
    in place of IRQ2. To select IRQ9, place jumper on the IRQ2 position.
	      
	      C:>SLT /b:300 /i:9 <ENTER>
		    This will test address 300 hex and IRQ9 on an "AT"
		    even though IRQ2 is selected.
		    

    SLT.EXE will enable RTS for RS-485 mode operation.


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