Changing The Physical Interface Settings - Equinox Systems ESP-2 MI Installation And User Manual

2.5 Changing the Physical Interface Settings

The factory default interface setting for both ports is RS-232. If this is the desired
interface, you may skip this section.
To enable the RS-422 or RS-485 interface for one or both serial ports (or, if you
previously enabled one of these interfaces and now wish to enable another interface),
use the following procedure. You will need a Phillips screwdriver. Proper electrostatic
discharge (ESD) protection should be used at all times. Use Figure 2 as a guide.
Figure 2: Jumper Locations and Settings
To change the physical interface settings:
1. Place the unplugged ESP-2 MI hub on a flat surface. Use the screwdriver to
loosen the two screws on either side of the unit (total of four screws). Remove the
screws. Lift the cover up and off the unit.
2. Locate the two ganged headers on the printed circuit board (PCB). Each ganged
header contains four columns of five pins. The jumper for each port is ganged
and covers two columns.
• Installing the jumper over the two rightmost pin columns enables the
RS-232 interface.
• Installing the jumper over the two middle pin columns enables the
RS-422 interface.
• Installing the jumper over the two leftmost pin columns enables the RS-485
2-wire HD interface.
To change a port's interface, lift the jumper off its current interface setting and
place it on the columns indicated above for the desired interface setting. The
interface settings are also printed on the PCB.
6 Equinox ESP-2 MI Serial Hub Installation and User Guide