High Current DC Motor Driver
I emailed Robokits India with the following question:


  In looking at the Users Manual for the RKI-1340, the specifications indicate forward and reverse motion may be achieved. This would imply that an H-bridge circuit is used, but the image of the board only shows 2 power mosfets (an H-bridge requires 4). Is this an image of the actual board? Are there additional power mosfets on the back side of the board? Can you please share a schematic?


and received the following response: 


  2 power mosfets are on the bottom side of the board.


From the RKI-1340 Users Manual under "Connector Information":


  V(+) 24Vmax and GND(-): Power Supply input to driver (Input Voltage)


This pretty much rules out the use of a dual-polarity power-supply.

I believe there can be very little doubt, the circuit is indeed an H-bridge.

Update:
I decided to email them (Robokits India) one more time for clairification:


  Is there a schematic and/or service manual available? Can you confirm that the design is an H-bridge?


Again no schematic (or explicit refusal), but they did confirm that it is an H-bridge:


  The design is a H-bridge driver only but you cannot use half bridge configuration on the same. The input signal will drive all four mosfets at once. There are no separate inputs for half bridges.