kittydog42
New Member
I am trying to develop an interface with an industrial controller via TTL. The manufacturer makes an RS485 or 232 interface that plugs into a header on the main board, so they will not give up any engineering information, instead instructing me to buy their board. This seems unnecessary since I need TTL in the end.
Their board uses an isolated RS485 transceiver. The inputs to the board are signals around 3.3 to 3.8 volts that go through transistors before going to the RS485 interface as TTL level signals. The original signals may not be TTL at all. There may be 4 signals in total going to the transistors, of which there is around six. Does anybody have any ideas as to what these transistors are doing or what my signal may be? It shouldn't be anything too exotic.
Their board uses an isolated RS485 transceiver. The inputs to the board are signals around 3.3 to 3.8 volts that go through transistors before going to the RS485 interface as TTL level signals. The original signals may not be TTL at all. There may be 4 signals in total going to the transistors, of which there is around six. Does anybody have any ideas as to what these transistors are doing or what my signal may be? It shouldn't be anything too exotic.
