Unit Configuration
4200-106
8-3
Revision 3
8.2
RS-485 Termination
A jumper on the circuit board is used for selecting a termination resistor for RS-485 connection. In most
cases, RS-485 termination is not necessary because maximum baud rate is 19200 bps (default is 9600).
RS-485 termination is recommended when intermittent communications occur. RS-485 termination is
enabled when the jumper is across Pins 1 and 2 of JP7 (not the factory default setting). It is disabled
when the jumper is removed across Pins 1 and 2. The location of the jumper is shown in the figure
below.
Note
: The factory default setting will not include the jumper inserted across Pins 1 and 2 of JP7.
Figure 5 - RS-485 Jumper Locations
