PMX MANUAL
19
118164-001 REV. A
The serial communication is part of the Multi
Signal Interface (JB1).
The RS232 communication interface has been
isolated inside the HVG with specific IC.
The pin definition shows below:
Pin #
Definition
Description
JB1-3
RS232 Tx
RS232 Transmit (out) from
generator
JB1-4
RS232 Rx
RS232 Receive (in) to
generator
JB1-13
RS232 ISO Ground
Isolated ground from the
isolated RS232 transceiver I.C.
User should connect the RS232 cable properly
with system side such as PC. Twisted wires are
preferable to enhance the EMC performance.
GUI software can be used temporarily to test the
PMX provided installed on the user PC. (Refer
to separate document for detailed information of
GUI). But user need to develop their own
ultimate software based on open protocol
(Refer to separate document) and design
system control board to integrated PMX into
their system with proper method (Refer to 2.6.1
NOTE the isolation requirement).
3.2.3
Digital I/O Control Interface
Remote digital control of the PREP, ROTOR
SHUTDOWN,
EXPOSURE, X-Ray
SHUTDOWN, are available on the 25-pin I/O
connector for maintenance.
All of these controls
except PREP and EXPOSURE are toggle on/off
type signals. PREP and EXPOSURE are
controlled by a momentary normally open
contact. If remote control is required, the remote
interface dummy plug must be removed and
replaced with the appropriate remote circuits.
See Figure 3-2 for recommended interface
circuits.
In order to eliminate signal bounce caused
by mechanical contact, an electronic switch
such
as
opto
coupler
device is
recommended for these signals.
Warning: Max current that the +24Vdc
supply can provide is 100mA.