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

Table 18. 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)

Revision D
Maintenance: RS-232C Connector Loopback Test
Service Screen
Measurement Site
J102, pin 7
J102, pin 22
J102, pin 2 100 mmHg
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 250 Series Monitor.
Access the Communications Setup screen (See
1.
page 4-52).
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.
Verify that, after a few seconds, the status Loopback OK displays. OK indicates
4.
that the test has passed.
NOTE: If Off remains displayed, the test has failed; contact your GE Service
Representative. Do not use this port to connect to any peripheral
equipment until the port or Communications Board has been serviced.
250 Series Maternal/Fetal Monitor
2020551-001
Expected Voltage
Setting
240 bpm +2.4V ± 10 mV
240 bpm +2.4 V ± 10 mV
+10.0 V ± 24 mV
13.3 kPa
Table 19 lists the signal description for each pin.
"Communications Screen"
Adjustment Site
R20
R29
R44
on
RJ-11C Connector
4-51