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time. For half-duplex operation, the two transmit pins should be connected to the two receive
pins (Tx+ to Rx+ and Tx- to Rx-). Four wire mode allows full duplex data transfers. RS-485 does
not define a connector pin-out or a set of modem control signals. RS-485 does not define a
physical connector.
©Sealevel Systems, Inc.
SL9219 – 04/2013
7804e Manual
21
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