PMX MANUAL
12
118164-001 REV. A
Pin #
Definition
Description
TB3-1
SMALL FIL
To tube small filament.
TB3-2
COMMON
To tube filament common.
TB3-3
LARGE FIL
To tube large filament.
Table 2-2. Pin layout of filament driver connector.
2.6
MULTI INTERFACE CABLE
CONNECTIONS
The PMX has multi interface connections
include digital I/O, serial communication, and
interlock. Operator must verify and connect
every signal properly though some of them
are optional, before initiating power-up and
basic test.
The interlock, serial communication and
exposure buttons interface shall be made
available via a multi signal cable. Refer to *-*
for a schematic of isolation and signal
direction.
2.6.1
Pin Layout of the Multi interface
The multi signal interface shall have a female
25 pin D-Sub (JB1) on the PMX. Twisted
pairs shall be used where applicable. The pin
layout is given in Table 2-3.
Pin #
Definition
Description
JB1-1
GND
Generator signal ground for reference of interface
circuits
JB1-2
(+) 5VDC Out
5 volts DC from generator for use in powering
interface circuitry such as optocouplers. 100mA
maximum.
JB1-3
RS232 Tx Out
RS232 Transmit (out) from generator
JB1-4
RS232 Rx In
RS232 Receive (in) to generator
JB1-5
PREP
User Signal (Contact Closure) to alert the
generator that exposure sequence will begin. Once
this signal is active, exposure parameters are
locked in and cannot be changed. The generator
enables the starter to boost the rotor. Contact
connection to pin 24. Closed = PREP.
JB1-6
READY
Generator Signal to user to indicate the rotor runs
to speed and the generator is ready for X-Ray
exposure. Transistor output. Low/Active=Ready
JB1-7
ROTOR SHUTDOWN
User Signal to generator to brake the rotor drive off.
Low brakes Rotor. (Open will not restart rotor until
a new PREP cycle is started). Reference to GND.
JB1-8
EXPOSURE
User Signal (Contact Closure) to generator to
generate X-Rays. Filament is boosted, and High
Voltage is generated after the boost time.
(Approximately 1 second). Contact connection to
pin 24. Closed=Exposure.