Zilog Z8F0411 - Manual (Page 32)

MDS General-Purpose Board Development Kit
User Manual
UM016905-1207 MDS-GP Board Features
27
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
2 C expander feature as described
in Software Selectable Serial Port Options on page 17.
Figure 14. RS-485 I/O Circuit