The PFCU-4 is a flexible control unit for both
Model PF4 Filter Inserters and Model PF2S2 Filter/Shutter Units.
In a 1-wide NIM module, it implements both manual control, via front
panel switches, and remote control, via either TTL I/O or RS-232
daisy chain. It is thereby compatible with a wide variety of computer
I/O modules. Since its 4 output lines are rated for 100 mA inductive
loads, it may also be used to control a variety of other experimental
Each output in the PFCU-4 is switched by 3 ORed inputs: a front
panel switch, a remote TTL input logic level, or RS-232 setting.
Output status is shown by a panel LED, output as a TTL logic level,
and can be read by RS-232. Thus, if remote control is overridden
from the front panel, the actual experimental situation is still
reported and can be accurately stored in the remote controller's
data record. The outputs are short circuit protected and both short
and open conditions are detected and indicated by flashing the LEDs.
RS-232 remote control can be made exclusive with a simple command
or disabled via front panel switch . The Model PFCU-4 combines with
a Model PF4 or PF2S2 and an appropriate cable (3 lengths available)
to implement a complete remote-controlled filter or shutter insertion
- Implements manual and computer control of PF4 filter unit, PF2S2
filter-shutter unit, small relays or other experimental equipment.
- 4 output lines, each at 24V, 5 - 100 mA, short circuit protected.
- Control via front panel switches, TTL remote control input signals,
or RS-232 commands. Reports output activation status via TTL or
- Detects both open and short circuits as error states; short
- Panel LEDs show normal activation, flash for error states.
- Simple RS-232 command language allows full control and monitoring
of filter/shutter status.
- Up to 16 PFCU-4 units can be combined on one RS-232 daisy chain.
- Single width NIM module powered from NIM bin or through RS-232
connector using accessory power supply and adapter.
- Simplified Experimental Setup
- Allows remote, "Beam On" selection of filters in front
of the sample or in front of the detector in a convenient, rapid
and reproducible manner.
- Automated Data Acquisition
Implementing computer control over a PF4 lets data with a large
dynamic range be collected automatically by allowing the control
program to automatically insert calibrated filters when the detected
intensity becomes too high, remove them again at lower intensity
levels, and record these insertions as part of the data file.
- Exposure Control
Implementing computer control over a PF2S2 unit allows software
to produce exposures based on input beam intensity, accurately
timed exposures, or exposures based on any other experimental
parameter of interest.
- Front Panel I/O
4 SPST switches: "In/Out";
1 SPST slide switch: "RS-232 Enable".
2 DB9 Male Plugs: "RS-232 Input" and "RS-232
- Rear Panel I/O
DB9 Female receptacle: 24V, 0-100 mA; diode protected
for inductive loads.
DB9 Male plug: TTL Control and Status.
Both Active LO.
- Fault Detection
Output currents below 3.5 mA are detected as Open Circuits
Output currents above 110 mA are detected as Shorts and switched
- Power Requirements
NIM: +12 V @ 200 mA. +24 V @ up to 400 mA, depending
Alternative RS-232: +24 V @ up to 600 mA, depending on
- Ordering Information
Dimensions: Single width NIM module.
Weight: Shipping 3.0 lbs; Net 1.5 lbs.
Warranty: One year
Prices: Per Current Price Sheet
NIM Control Module Datasheet
(114 KB, PDF)
PFCU User's Manual
For current NIM modules with the BLACK front panel as pictured
on this page.
(NEW August 2005, 50 KB, PDF)
PFCU NIM Control Module
(114 KB, PDF)