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Equinox ESP-2 MI Serial Hub Installation Guide
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The unit also contains a 3-pin screw terminal block connector which provides connection
for a 9 VDC to 30 VDC power source. The location of the positive, ground and negative
pins are screened on the front panel.
Surge protection is provided for each serial port up to 15,000 volts ESD.
Technical Specifications
Table 5 lists the ESP-2 MI technical specifications.
Specifi cation Operating
Range
Dimensions
4.75”W x 4.38D x 1.62”H
Temperature 0˚-50˚C
(32˚-122˚F)
Humidity 10-90%
non-condensing
Power
9-30 VDC at less than 4W
Table 5. ESP-2 MI Operating Specifications
Changing the Interface Settings
The factory default 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.
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Installing the jumper over the two rightmost pin columns enables the RS-232 interface.
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Installing the jumper over the two middle pin columns enables the RS-422 interface.
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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 corresponding to the desired interface setting. The interface settings are
screened on the PCB.
5. If you are enabling the RS-422 or the RS-485HD interface on a port, you may also
enable/disable 100 ohm termination of the differential receive signal pair on that port.
This termination is enabled by placing a jumper on the 2 pins adjacent to the ganged
jumper for the port; see the location noted in Figure 2. Termination is enabled by factory
default, that is, the jumper covers both pins for each port.
