Series EJ, ET, EY, FJ & FR
102002-177 Rev M2
38
\1020\02177M2.doc 17 Jun 2019
REMOTE DIGITAL INTERFACE
EJ/ET/EY/FJ/FR Computer Interface
This section describes the specific implementation of the XP Glassman High Voltage
RS2323/USB/Ethernet Serial Data Interface for the ET/EJ/FJ/FR series power
supplies. The Ethernet interface (U1) is optional and is not included with standard
power supplies.
The purpose of this interface is to provide remote monitoring and control capability
of all analog and digital functions available for these power supplies, while providing
1000 V RMS voltage isolation between the power supply and the controlling
computer. The interface is microcontroller based and built into the control board of
the power supply.
The interface uses ASCII encoded character strings for data transmission.
Transmission error checking is implemented using modulo 256 checksums. The
transmission format uses no parity and one stop bit with a baud rate of 9600.
The power supply interface acts strictly as a slave device. It will not transmit any
messages over the data link unless it receives a request from the master computer.
Note that the Interlock on J3 must be satisfied and the HV ON function must be
operated by either pressing the front panel HV ON button or using the Remote HV
ON pins on J3, before being able to control the unit with the digital interface.
SERIAL INTERFACE CONNECTIONS
(SEE FIGURE 10 ON INTERFACE DRAWING)
RS232:
Using the provided Null Modem cable, attach the control computer’s serial port to J1
on the rear panel of the power supply.
USB:
J2 on the rear panel is USB “B” connector. The USB connection is detected
automatically and it will take precedence over RS232. A standard USB cable is
provided.
ETHERNET (optional):
Using a CAT5e Ethernet cable, attach U1 on the rear panel of the power supply to
the local network. Alternately, the power supply can be connected directly to a
computer’s Ethernet port using a crossover Ethernet cable. The Ethernet connection
is detected automatically and it will take precedence over both RS232 and USB.
