Datascope System 98 Service Manual page 360

7.5.2 External RS-232 Port Test
External RS-232 Port Test
instructions : Connect pin 2 to 3 on external RS-232 connector. Press SELECT key.
Transmitted Characters :
THE QUICK BROWN FOX JUMPED OVER THE LAZY DOGS BACK
Received Characters :
THE QUICK BROWN FOX JUMPED OVER THE LAZY DOGS BACK
Status : TEST PASSED
| CHANGE/SELECT - Start Test DONE - Exit!
The purpose of this test is to verify the integrity of the RS-232 channel. The
transmit and receive pins need to be connected together on the rear panel RS-232
connector. This action will allow the serial communication channels to transmit
data and receive back the data that is sent.
1.
2
Select External RS-232 Port Test from the main menu.
REAR VIEW
- . . — >
. Use bus wire to jump pins 2 and 3 (transmit A
and receive lines) of the rear panel RS-232 ο ο ο 0 ο)
connector together. Pin 2 Pin 3
. Press the SELECT key to run the test. Transmitted characters are compared
to received characters until the entire test string "THE QUICK BROWN
FOX JUMPED OVER THE LAZY DOGS BACK" has been sent.
. The status line will indicate if the test passes. If the data is received incorrectly
or data is missing the test will fail and display "Incorrect or no character
received". The test will also fail if the transmit and receive are not jumped
together.
. Remove jumper.
. Press the DONE key to exit the test.
Figure 7-10
RS-232 Test Screen
System 98 Service Manual
Chapter 7 - Calibration
7-17