General Operation; Serial Interface Test - Philips M3921A Service Manual

General Operation

General Operation

Serial Interface Test

Note
26
4. Press the ON/STANDBY button
5. After normal power-up sequence, verify temperature reads 37°C ±0.1°C (98.6°F
±0.2°F if Fahrenheit is selected as temperature units.)
6. Turn the monitor off.
The following tests provide an overall performance check of the system:
• Serial Interface Test
• Printer Verification (for optional printer - A1 only)
Perform only if nurse call signal is used.
Perform the following procedure to test the serial port voltages. The test is
qualitative and only verifies that the serial interface port is powered correctly,
and that the Nurse Call signal is operational. The serial connector is a male
DB-9 located on the monitor's real panel, identified with the RS-232 symbol
.
1. Turn the monitor on.
2. Set up the DMM with the function set to
3. Connect the DMM negative lead to connector pin 5 (GND), or the shell of the
RS-232 connector.
4. Referring to the following table, connect the DMM positive lead to each pin in
turn, and verify the voltage values listed. Voltage for pin 9 is that listed for the
no alarm
condition.
to turn monitor on.
VDC
at a range of 10 volts.
Performance Verification