MC2100 Datasheet, PDF (43/58 Pages) List of Unclassifed Manufacturers – Motion Processors

6.4 RS 422/485 Serial Interface
The interface between the Navigator chipset and an RS-422/485 serial port is shown in the following
figure.
Comments on Schematic
Use the included table to determine the jumper setup that matches the chosen configuration. If
using RS485, the last CP must have its jumpers set to RS485 LAST. The DB9 connector wiring is
for example only. The DB9 should be wired according to the specification that accompanies the
connector to which it is attached.
For correct operation, logic should be provided that contains the start up serial configuration for the
chipset. Refer to the RS232 Serial Interface schematic for an example of the required logic.
Note that the RS485 interface cannot be used in point to point mode. It can only be used in a multi-
drop configuration where the chip SrlEnable line is used to control transmit/receive operation of the
serial transceiver.
Chips in a multi-drop environment should not be operated at different baud rates. This will result in
communication problems.
MC2100 Technical Specifications
43