Sonics VC750 (Serial No. "Y through "AB")" - Manual (Page 7)

FUNCTIONS OF KEYS, CONTROLS, INDICATORS, AND CONNECTORS (cont.)
REAR PANEL
9-pin D-sub connector Connects to external actuation device, and enable power and frequency
monitoring
Footswitch jack Connects to the footswitch cable.
Coax connector Connects to the converter.
Power module Connects to the electrical line cord and encases the fuse(s).
Temperature probe jack Connects to the optional temperature probe.
4
9-PIN D-SUB CONNECTOR
Pin No. Description
1 Not connected
2 Not connected
3 Not connected
4 Enables connection to a frequency counter.
5 Enables connection to an external power monitor (5 mv = 1 watt)
6 Ground
7 Energizes the ultrasonics when connected to ground.
8 and 9 Enables the intensity to be remotely adjusted using an external 10k potentiometer.
See below
NOTE
To vary the intensity remotely using a variable DC
power supply (0-5V) instead of a 10 K potentiometer,
connect positive to pin 8 and negative to pin 6.
to pin 9
10K to pin 8
to pin 6