P
ORTA
C
OUNT
®
Plus Model 8020 Technical Addendum
revised 7-27-2001
TSI Incorporated, St. Paul, Minnesota, USA
5
Copyright © 2001 all rights reserved
DIP Switch 4: Memory Lock
Switch 4 allows you to lock the P
ORTA
C
OUNT
Plus memory so that the internal settings for
the sampling times, fit factor pass level and number of exercises cannot be changed from
the P
ORTA
C
OUNT
Plus Keypad or by using the MODIFY program software supplied with
the instrument. The reason you might want to lock memory is to prevent unauthorized
persons from altering the fit test protocol. The factory setting for switch 4 is ON which
means that memory lock feature is OFF and the internal settings can be changed using the
Keypad or software. The FitPlus software is not affected by DIP switch 4.
Memory
Switch 4
Unlocked
ON
Locked
OFF
DIP Switch 5: Factory Checkout
Switch 5 is used by TSI when performing factory checkout of the P
ORTA
C
OUNT
Plus and
should always be in the ON position for normal use.
Mode
Switch 5
Checkout
OFF
Normal
ON
DIP Switch 6: Reset Factory Settings on Power Up
Switch 6 should always be left ON unless you want to reset all the internal settings back
to the way they were when the P
ORTA
C
OUNT
Plus was new.
When switch 6 is OFF, the P
ORTA
C
OUNT
Plus will reset back to the factory settings when
the power is turned on. Once the power is turned back on, you will be able to change the
internal settings (unless switch 4 is OFF), but they will be reset to the factory values the
next time the power is turned off and then on again.
If you want to reset the internal settings back to the factory values, move switch 6 to the
OFF position and then start the P
ORTA
C
OUNT
Plus. Now turn the P
ORTA
C
OUNT
Plus off and
change switch 6 back to the ON position. The instrument will be reset and you will be
able to permanently change the internal settings. The factory settings are:
Fit Factor Pass Level:
100
Number of exercises:
8
Ambient Purge Time
4 sec
Ambient Sample Time
5 sec
Mask Purge Time
11 sec
Mask Sample Time, All exercises:
40 sec
DIP Switch 7: Reserved
Switch 7 must always be left ON.
DIP Switch 8: Use CTS
When switch 8 is on (the factory setting), the P
ORTA
C
OUNT
Plus will not require a Clear
To Send (CTS) signal in order to send data through the RS-232C Data Port to a
