User Guide

PAMS
Technical Documentation
NME–3
JBD–2 User Guide
Page 17
Issue 1 10/99
Test Setup
RU
JBD–2
HS
TDC–4
PC
Measure Application
With the tappet switch it is possible to inject a specific PWM signal. E.g.,
75% and WinTesla reads the converted signal from NME–3–RU and show
it in the correct window. Check if the signal value meets the expected
value.
RS232 Test
Connect to the RS232 interface to test the functionality of the connector. If
Service SW starts the interface test, the test signals pass the Loop
Adapter and will be sent back, if the interface is working correct.
Loop Adapter circuit :
RS232
Connector
TXD, RTS, DSR, DCD, RI
Decoder
RXD, CTS, DTR
TXD
DSR
RI
RXD
DTR
CTS, DSR
CTS DSR CTRL
0X 0
X0 0
11 1
CTS
DCD
RTS
RS232–Test
OFF
ON
Note: CTRL=’l’ DCD,RI connected to CTS,DTR
Figure 13. RS232 Test Circuit
The test circuit has two possible states. The first state is the ‘ normal–loop ’
mode and the second condition is the ‘
advance–loop ’ mode. The CTS and
DSR lines can control the switching between the two modes.
• In the normal–loop mode, the lines RX/TX, RTS/CTS and DSR/DTR
can be checked.
The service software must be regarded that the CTS and the DSR line never take
the logical value ‘1’ at the same time.