 The VACOSS Active Terminator was designed by CANBERRA Albuquerque, Inc. to increase the maximum communication
distance to a VACOSS seal. It functions like a SCSI terminator, and in fact, most SCSI terminators are actually
“active terminators”. Electrically, the impedance on the communication line increases as the length of the communication
cable increases. High impedance lines are very susceptible to line noise and communication errors. Active terminators help to reduce impedance
on the communication lines because they function as a parallel resistor. When the VACOSS Active Terminator is plugged into the last VACOSS seal in a series of seals, total impedance on the wire is reduced, so line noise is reduced, and communications are successful over longer distances.
The Active Terminator is recommended
for use particularly in cases where VACOSS seals and DCM-14 modules are used together. With a DCM-14, communication
signals break down at about 50 meters. With an active
terminator plugged into the VACOSS seal, successful communication
may be achieved with cable lengths of over 150 meters. The Active Terminator is potted in a secure LEMO connector, which provides security and water resistance.
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