Hardware Hardware How-Tos Current: Possible Jumper Assignments on Com Port M330C PDF Download PDF Download page Possible Jumper Assignments on Com Port M330C. Current page All pages Possible Jumper Assignments on Com Port M330C How much voltage does the serial port (9 pin) offer?There are different combinations of jumper assignments on the connectivity bar of the IGEL-M330C Series (IGEL UD3/IZ3):The serial ports default setting is Normal Ring. +5V / +12V can be supported by setting the jumpers on the POF board: COM 1 Normal Ring (3-5) or (5-7) +5V Power (1-3) +12V Power (7-9) COM 2 Normal Ring (4-6) or (6-8) +5V Power (2-4) +12V Power (8-10) ×