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Diagnostics & Trou ble shoot ing
2. After connecting appropriate loop-back con nec -
tions above, press the appropriate key to initiate
the de sired test. An LED will illuminate in di cat ing
the test is in progress. If it is desired to ter mi nate
the test, press the CANCEL TEST key. Test data is
sent from an output to an input as de scribed below.
At the completion of each test, if the data received
matches the data sent, the Serial Port op er ates
prop er ly and PASS is displayed. Oth er wise, FAIL
is displayed, indicating the Serial Port is de fec tive.
A FAIL result would be indicative of a defective
Microboard. The following is a de scrip tion of each
test.
COM 1 – Two tests are performed. Test data is
sent from TX (J2-4) to RX (J2-3) at 9600 Baud
and DTR (J2-5) is set to a Logic High level and
read at DSR (J2-2). If any test fails, COM 1 tests
are ter mi nat ed.
COM 2 – Three tests are performed. Test data is
sent from TX (J13-5) to RX (J13-3) at 19200 Baud.
TRANSMIT
RECEIVE
+5VDC
FIG. 70 – MICROBOARD - COM 5 SERIAL DATA PORT
158
TX
RX
COMMON
IN
OUT
+5VDC
LOOP-AROUND TEST
DTR (J13-7) is set to a Logic High and read at DSR
(J13-2) & DCD (J13-1). RTS (J13-4) is set to a
Logic High and read at CTS (J13-6) & R1 (J13-8).
If any test fails, COM 2 tests are ter mi nat ed.
RS-485 (COM 3 & 4a) – Test data is sent from
COM 3 RS-485 port to COM 4a RS-485 Port at
19200 Baud. Test data is then sent from COM 4a to
COM 3 at the same rate. If either test fails, RS-485
tests are terminated.
COM 4b – Test data is sent from GTX (J2-7) to
GRX (J2-6) at 19200 Baud.
COM 5 – Test data is sent from TX (J15-1) to J15-4
at 1200 Baud. This output turns the Microboard's
loop-around test Transistor on and off, applying
0/+5VDC pulses from J15-5 to RX (J15-2) input.
3. After all desired tests have been performed, press
the DIAGNOSTICS key to return to the MAIN
DIAGNOSTICS Screen.
J15
1
1
2
2
3
3
4
4
5
5
6
6
LOOP-AROUND DIAGNOSTIC CONNECTOR
YORK PIN 025-33778-000
INSTALL TO PERFORM DIAGNOSTIC
FORM 160.54-M1(503)
LD04250
YORK INTERNATIONAL
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