300Tibbo Project System (TPS)
© Tibbo Technology Inc.
LEDs
There are four green LEDs which are connected to four control lines. LEDs light up
for the LOW state of control lines (i.e. when current passes through the diodes of
the opto-couples).
7.2.9.16
#05, M1S: RS485 Port
Function: RS485 port with full-duplex or half-duplex operation
Form factor: M1S
Category: Input/output module
Special needs: [SER]
Power requirements: 5V/15mA
Mates with: #19, #20, #21
See also: #01, #02
Details
This port has only +/-RX and +/-TX signal pairs. If you are working in the half-
duplex mode, connect +RX to +TX, and -RX to -TX. This will allow your system to
communicate over a single twisted pair. Direction control is through the RTS line --
the line shall be LOW for data input and HIGH for output. Keep the RX and TX pairs
separate for the full-duplex mode and set the RTS line HIGH to keep the TX enabled
at all times.
For "normal" RS485 applications, this Tibbit has to be connected to the TX and RX
lines of the CPU's UART (see [SER]).
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