Veeco MS40 Operation And Maintenance Manual page 158

leak detector has changed to the ROUGHING TESTPORT state 6 or 13. After
this happens, we still monitor the present state and the reject status. Once the
reject status changes to either an ACCEPT or a REJECT, we can terminate the
test cycle by sending the string 'K01Z'. At this time the present state will
change to 4, 5, 11, or 12 and we will need to vent the testport to enable the
operator to remove the test object. For this we need to send the string 'K15Z'.
Now the sequence can be repeated for more test objects.
If we want to SNIFF test, the sequence wouldn't change except for the present
state values. First we would have to change the present state from a Vacuum
Mode standby to a Sniffer Mode standby by sending the string 'K13Z' when
the MS-40 was in one of the vacuum mode standby states of 4, 5, 11, or 12.
This will cause the MS-40 to change to either state 18, 19, 22, or 23. If the
leak detector is set for manual ranging, the Sniffer Mode standby states would
be 22 or 23. Once the correct standby state has been entered, we can continue
with the normal operational sequence.
During a test cycle, if we wanted to change from manual ranging to automatic
ranging or vice-versa, all we have to do is send the string 'K23Z' which is
equivalent to pressing the Auto/Manual Ranging Button on the MS-40's user
panel.
The RS-232 data format is: a. 8 Data Bits
Hand-shaking is done by using a NULL MODEM adapter or equivalent and
observing the following rules:
1.
2.
3.
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The MS-40 will start sending the data stream when it is issued the
appropriate command ('S1Z').
The MS-40 will not transmit when its CTS line (RTS line of remote
PC) is driven low. This should only be done during serial port
interrupts on the remote PC.
The remote PC must not send data to the MS-40 when the MS-40 has
driven its RTS line low (CTS line of PC remote).
b. Even Parity
c. 9600 Baud
d. 1 Stop Bit
d-xx