We are using Motorola
MVME 167B CPU sitting on a 6U VME crate on PMD rack 2.
There is a Transition card
MVME 712/M connected to the backplane.
The Serial port 1 is connected to the slow control terminal server sitting in the PMD Rack3. The serial port 2 is connected to the LeCroy 1454 HV mainframe through a no-modem cable with DB25 and DB9 connectors at the two ends. The ethernet port is connected to the ethernet hub sitting near the PMD racks.
LeCroy 1454 is a part of the LeCroy 1450 Modular High Voltage system called VISyN which is a flexible HV system for PMTs, wire chambers, silicon strip, germanium and Micro strip gas detectors. The term VISyN signifies Voltage and Current System on Network. It actually includes two different parts, a crate or mainframe and compatible HV cards.
The 1454 mainframe is a 4U crate with RS232 or ARCNET option for remote communication, a keyboard and LCD display on the front panel for local operation. The crate can take up to 4 cards. We are using three 1461N cards which has 12 individual channels per card with fixed negative polarity. The cards can go up to 3kV with a current of 2.5 mA for 2.8-3kV and 1mA for 0-1kV. The DB9 connector at the back of the mainframe is for RS232 communication and here it is connected to the MVME CPU.