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The 7i74 is a 8 channel RS-422 interface for Mesa's 25 pin I/O FPGA cards.
The 7i74 has 8 independent receive and transmit channels. One transmit
channel has a independent drive enable for bus or 2 wire half duplex
systems. Serial I/O connectors are RJ45 jacks allowing standard CAT5
cables to be used for high speed serial links. The 7i74 also supplies 5V power on the RJ 45 connectors. PTC
devices limit maximum 5V current to 1A. The pinout used is compatible
with Mesa's 3C20 motion controller and the 8i20, 8i21 serially connected
amplifiers and all serial interfaced I/O cards.
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