Changing The Interface Settings - Equinox Systems ESP-2 Product Installation Manual

Changing the Interface Settings

The factory-set interface setting for both ports is RS-232. If you want the ports to use this
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 want 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.
1. Place the ESP-2 MI unit on a fl at surface.
2. Use the Phillips screwdriver to loosen the two screws on either side of the unit (total of
four screws). Remove the screws.
3. Lift the cover up and off the unit. Use Figure 2 as a guide to locate the two ganged headers
on the printed circuit board (PCB).
4. Each ganged header contains four columns of fi ve 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
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Equinox ESP-2 MI Serial Hub Product Installation Guide
Figure 2. Jumper Locations and Settings