Compatibility Issues between the Pro 3 and Pro 4
There are several compatibility issues between the Pro 4 and prior versions.
Control Panel
The control panel has been changed significantly from the Pro 3 to the Pro 4. The Pro 4 uses 74 Volts DC in the tether, while the Pro 3 uses 48 Volts DC, and the communications protocol was changed.
 Do not attempt to plug a Pro 3 ROV into a Pro 4 control panel, or a Pro 4 ROV into a Pro 3 control panel. Doing so may cause damage to the components.
Accessory Port
The accessory port has been changed from the Pro 3 to the Pro 4. The table below lists the changes.
|
Pin
|
Function (Pro 3 / Deep Blue)
|
Function (Pro 4)
|
|
1
|
Video -
|
Video -
|
|
2
|
Video +
|
Video +
|
|
3
|
48 VDC + (30 Watts)
|
24 VDC + (30 Watts)
|
|
4
|
Aux +
|
Aux +
|
|
5
|
Ground
|
Power Common (Ground)
|
|
6
|
Aux -
|
Aux -
|
|
7
|
Manipulator 24 VDC -
|
RS-485 -/A
|
|
8
|
Manipulator 24 VDC +
|
RS-485 +/B
|
|
9
|
12 VDC + (6 Watts)
|
12 VDC + (30 Watts)
|
Lights
The Pro 3 and Pro 4 lights are not interchangeable between these two systems even though the connectors are the same. Using a Pro 3 light bulb on a Pro 4 ROV, or a Pro 4 LED on a Pro 3 ROV may cause damage to the lights or the ROV.
Manipulator
The Pro 3 and Pro 4 manipulators are not interchangeable between these two systems even though the connectors are the same. Using a Pro 3 manipulator on a Pro 4 ROV, or a Pro 4 manipulator on a Pro 3 ROV may cause damage to the manipulator or the ROV. You can tell the difference between Pro 3 and Pro 4 manipulators by the length of the main body. The Pro 3 body is about 75 mm (3 inches), while the Pro 4 body is about two times as long at 150 mm (6 inches). The Pro 3 manipulator uses pins 7 and 8 for + or - 24 Volts DC to drive the motor. The Pro 4 manipulator includes a processor board to allow multiple manipulators to be used on one ROV. On the Pro 4 manipulator, pins 7 and 8 are used for communications, pins 3 and 5 are used for power (24 Volts DC) and pin 12 is used to power the processor board (12 Volts DC, converted to 5 Volts DC on the board).
Calibration
The Pro 4's depth gauge and compass do not need to be calibrated.
Run Time
The run time of the Pro 3 is stored in the control panel. The run time of the Pro 4 is stored in the ROV. This provides a more accurate representation of the amount of hours of use of the ROV.
Tether
VideoRay tether can be used with any model. The maximum tether length of the Pro 4 has been increased from about 365 meters (1,200 feet) for the Pro 3 to about 600 meters (2,000 feet).
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