Rs-232C Connector Loopback Test; Making A Loopback Test Connector; Testing The Port(S) - GE Corometrics 250cx Series Service Manual

Table 10. DAC Output Voltages and Adjustment Points for Corometrics Central Station Outputs
Analog Signal
HR2
UA
Table 11. DAC Output Voltages and Adjustment Points for Hewlett-Packard Central Station Outputs
Analog Signal
HR1
HR2
UA

RS-232C Connector Loopback Test

Making a Loopback Test Connector

Testing the Port(s)

4-48
Maintenance: RS-232C Connector Loopback Test
Service Screen
Measurement Site
J102, pin 22
240 bpm
0 relative units
J102, pin 2 (mmHg and kPa)
100 mmHg
13.3 kPa
Service Screen
Measurement Site
J102, pin 7 240 bpm
J102, pin 22 240 bpm
J102, pin 2 100 mmHg
13.3 kPa
The Communications Setup screen includes a loopback test option for each of the
communications ports: J109, J110, and J111. Running the test requires inserting a
loopback test connector into each port being tested. (You can test more than one port
at a time.)
Start with an RJ-11C connector and bridge pin 2 (RXD) and pin 5 (TXD) together.
The figure below shows the pinout of a communications port while you face the rear
panel of a 250cx Series Monitor. Table 12 lists the signal description for each pin.
Access the Communications Setup screen (See "Communications Screen" on
1.
page 4-49).
2. Insert a loopback test connector into each communications port being tested.
Set the mode field on the Communications Setup screen to Loopback. Notice that
3.
the word Off displays to the right of the mode.
250cx Series Maternal/Fetal Monitor
2036947-001
Expected Voltage
Setting
– – – –1.2 V ± 10 mV
+1.2 V ± 10 mV
–1.2 V ± 10 mV
+1.2 V ± 10 mV
Expected Voltage
Setting
+2.4V ± 10 mV
+2.4 V ± 10 mV
+10.0 V ± 24 mV
Adjustment Site
R27
R29
R42
R44
Adjustment Site
R20
R29
R44
Revision C