Null-Modem Cable DEFINITION: A null modem cable allows you to connect your PC to another nearby PC or serial device using its modem protocol. A popular use of null modem cables is for setting up "head-to-head" gaming between two players at different computers in the same room. (A null modem cable is limited to 30 feet in length.)The standard RS-232C serial communications interface defines a signal protocol between a Data Terminal
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