Zilog Z8F0411 Instrukcja Użytkownika Pobierz pdf (Strona 32)

MDS General-Purpose Board Development Kit

User Manual

UM016905-1207 MDS-GP Board Features

RS-485 I/O

Figure 14 displays the RS-485 port provided on screw terminal block J4.

This I/O can also provide power to the MDS-GP board through the 12 V

DC and GND lines, terminal 1 and terminal 4. An RS-485 termination

resistor can be enabled or disabled using jumper J5. The RS-485 driver

U8 is enabled through the RS-485_EN signal, which is controlled via

jumpers on J2 or by using the software I

C expander feature as described

in Software Selectable Serial Port Options on page 17.

Figure 14. RS-485 I/O Circuit

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Zilog Z8F0411 Instrukcja Użytkownika Strona 32