13 – SERVO-DISABLE
The Servo-Disable option is the same as the BCD
Data Inhibit explained above, except that it is
brought out to a separate rear panel connector.
Pins A and B of the five pin connector (refer to
figures 8.7 and 8.12) can be shorted or opened by
an external switch to hold or release the BCD
signal, respectively.
14 – EXTERNAL MEASURE MODE
SWITCH
Unless otherwise specified, this option is wired to
pins 1 and 2 of a female 9-pin D-Sub accessory
connector added to the rear panel (see figure 8.12).
This connector is labeled “TTL INPUT”.
To use this feature connect an external, normally
open switch to pins 1 and 2 of the TTL input
connector on the modified rear panel of the PCS
400. With the switch contacts open the instrument
will operate normally.
Closing the external switch contacts will cause the
PCS 400 to: a) immediately go to the MEASURE
mode; and, b) freeze the instantaneous pressure
value in the display, and on the remote bus, pre-
venting further updates. The unit will remain in this
state for as long as the contacts remain closed.
When the short is removed from the TTL input
connector normal operations are restored, but the
unit will remain in the MEASURE mode until
manually or remotely commanded to another
mode of operation.
15 – MEASURE MODE SIGNAL OUTPUT
This option provides an internal switch closure to
short two pins of an external connector as an
indication that the PCS 400 is in MEASURE mode.
The switch will open in STANDBY, CONTROL and
VENT modes. Unless otherwise specified this
switch is wired to pins 29 and 30 of the 36 pin
accessory connector on the rear panel (see figures
8.10 and 8.12).
Specifications
Form A contact closure, normally open, close on
MEASURE mode.
100 volts maximum switching.
0.5 amps maximum switching.
MEASURE/
CONTROL
REFERENCE
EXHAUST SUPPLY
IEEE STD 488 PORT
SH1, AH1, T6, L4,
SR1, RL1, PP0,
SERIAL
PORT
FUSE:
250V/1.5A
“This equipment complies with the
requirements in Part 15 of FCC Rules for a Class
A computing device. Operation of this
equipment in a residential area may cause
unacceptable interference to radio and TV
reception requiring the operator to take
whatever steps are necessary to correct the
interference.”
D-Sub Accessory Connector
5 Pin Connector
(optional)
Figure 8.12 - PCS 400 Rear View
OPTIONS PCS 400
8-18 www.mensor.com
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