Communication Interfaces Tests; Rs-232 Serial Interface Test For Pc; Fig. 5.3 The Correct Sequence For Pressing The Keys At Keyboard Test 2; Fig. 5.4 Modular Jack 6×6 Terminal Connector - ELCOM Euro-500 Handy Series Service Manual

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Fig. 5.3 The correct sequence for pressing the keys at keyboard test 2

5.4 Communication interfaces tests

5.4.1 RS-232 serial interface test for PC

The RS-232 serial interface test allows the diagnostics
of sending and receiving of serial data through the
Modular Jack 6×6 male connector (cable connexion is
described in chapter 4.15) that is used to connect the
ECR to PC.
Procedure:
1. Switch the ECR into programming mode.
2. Plug the terminal connector into the PC connector on the rear ECR
panel.
3. Enter '501' using numerical keys.
4. Press the [Multiply] key.
Testing procedure:
1. The microcontroller sends one byte to the connector output for the com-
puter.
2. The sent byte is received back into the microprocessor through the
terminal connector.
3. Test run is displayed shortly on the display and printed on the printer.
If the serial PC communication test yields an error, follow the instructions
in the chapter 6.6.
Caution: The serial interface test fails (i. e. detects an error) only in two
cases: 1) if the terminal connector is not plugged in and the test reports as
"OK" and 2) if the terminal connector is plugged into the ECR and the test
report as "Error". This means, that the valid test results can be obtained
only by using the test along with the correctly prepared terminal connector
for the serial interface port.
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Fig. 5.4 During the serial
n A
interface tests the tested in-
TxD
R xD
terface shall be connected
spo
1 2 3 4 5 6
with the Modular jack 6×6
terminal connector that is
l
built as shown on the left
Successful test summary:
501
Failed test summary:
501
© Elcom, s. r. o.
** TEST **
OK
** TEST **
Error
53