3. OPERATION
Page
47
©2001~2007
DH Instruments, a Fluke Company
If COM2
→
COM1 passes: <PASSED>
is displayed briefly followed by the
conclusion,
<The RS232 test has PASSED>
.
If a test fails:
Execution is suspended until
[ENTER]
is pressed.
The MFC-CB RS232 test can fail for three reasons:
1.
The RS232 cable being used is incorrect (see Section 4.2.1 for information on the
correct cable).
2.
COM1 and COM2 do NOT have the same serial communications settings and
therefore cannot communicate together (see Section 3.4.5.1 to set the
COM ports).
3.
COM1 or COM2 is defective.
The reason for failed communications is almost always a cable or incorrect RS232
interface settings. Be sure that these are correct before concluding that a COM port
or MFC-CB communications are defective.
3.4.6
<6XBOX>
PURPOSE
To set up an optional MFC Switchbox for operation on one of the MFC-CB
device channels.
PRINCIPLE
An optional MFC Switchbox is available. The MFC Switchbox is connected to one of the
MFC-CB device channels (DEV1, DEV2) and allows that channel’s set point and
measurement to be switched between five channels on the Switchbox. This allows
multiple MFCs or MFMs to be connected to one of the MFC-CB device channels and the
MFC-CB device channel signal to be switched between them. As the MFC Switchbox
permanently powers all five channels, this feature is frequently used to keep multiple
MFCs connected and warmed up for immediate use.
MFC-CB only supports one MFC Switchbox at a time so the Switchbox must be
connected either to DEV1 or DEV2. Figure 5 illustrates the setup of MFC-CB with an
MFC Switchbox. See the MFC Switchbox User’s Manual for additional information on
setting up and using an MFC Switchbox.
