5-34 250cx Series Maternal/Fetal Monitor Revision C
2036947-001
Troubleshooting: FAQs
How do I test the RS232 outputs? 1. The 250cx Series Monitor Serial Interface is capable of being tested by means of a
loop back connector. A loop back connector simply routes the TX line from the serial
port to the RX line of the same serial port.
2. Enter the Install Options Screen 1. (“How do I access the service setup /
install options screens?” on page 5-27.)
3. In the Install Options Screen 1, rotate the Trim Knob to highlight the COMM softkey
at the bottom of the display below the menu bar.
4. Press the Trim Knob to enter the Communications Setup screen.
5. On the Communications Setup screen, the three items in the column at the far left
represent the rear panel RS232 Communications Port designations J109, J110 and
J111. The middle column represents the current Baudrate for the associated
communications port (same line reading across), and the last column on the right
represents the communication protocol for the associated communication port.
6. To change a Baudrate, rotate the Trim Knob to highlight the desired baudrate
selection on the desired communication port line.
7. Press the Trim Knob. The current setting displays in blinking inverse video.
8. Now rotate the Trim Knob to change the current baudrate setting. Select from one of
the following: 600, 1200, 2400, 4800, 9600, and 19200.
9. When the desired test baudrate displays, press the Trim Knob again to save. The
current value stops blinking.
10. Note the current protocol setting so that it may be reset when testing is completed.
11. Then rotate the Trim Knob to highlight the protocol selection of the desired
communication port line.
12. Press the Trim Knob. The current setting displays in blinking inverse video.
13. Now rotate the Trim Knob to change the current setting to Loopback.
14. The column immediately to the right now displays a new indication, Off.
15. Insert the loopback connector in the corresponding rear panel serial port connector.
Within a few seconds the Off indication should change to OK.
16. Return the protocol setting to the setting previously noted, and press the Trim Knob
to save. The current value stops blinking.
17. Repeat Steps 6 through 16 for each of the serial ports.
18. To exit the Service mode following the instructions at the top of Page 16.
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