Toshiba Libretto 50CT, User Manual

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3.10 Async Test 3 Tests and Diagnostics
3-22 Libretto 50CT/70CT Maintenance Manual
3.10 Async Test
To execute the Async Test select 7 from the Diagnostic Test Menu, press Enter and follow
the directions displayed on the screen. The async test contains seven subtests that test the
asynchronous communication functions. Move the highlight bar to the subtest you want to
execute and press
Enter .
Subtests 01 through 07 require the following data format:
Method: Asynchronous
Speed: 9600BPS (Subtests 01 to 04)
38400BPS (Subtests 05 to 07)
Data: 8 bits and one parity bit (EVEN)
Data pattern: 20h to 7Eh
The following message displays at the bottom of the screen when Subtests 01, 03, and 04 are
selected:
Channel#1 = XXXXh
Channel#2 = XXXXh
Channel#3 = XXXXh
Select the Channel number (1/2/3)
The serial I/O port address is specified by the XXXXh number. Select the serial port channel
number, and press
Enter to start the subtest.
Subtest 01 Wraparound (board)
NOTE : To execute this subtest a serial port wraparound connector
(34M741621G01) must be connected to the serial port. The serial port
wraparound connector wiring diagram is described in Appendix E.
This subtest checks the data send/receive function through the wraparound
connector.
Subtest 02 Point to point (send)
NOTE : To execute this subtest, two machines must be connected with a
serial port direct cable. One machine should be set as “send”(Subtest 02)
and the other set as “receive” (Subtest 03). The wiring diagram for the
serial port direct cable is described in Appendix E.
This subtest sends 20h through 7Eh data to the receive side, then receives the
sent data and compares it to the original data.