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3.
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 two pins adja-
cent to the ganged jumper for the port; see the location noted in Figure 2 on page
6. Termination is enabled by factory default, that is, the jumper covers both pins
for each port.
This termination is typically used in RS-485 environments when the device is the
first or last on a multi-drop line for a 2-wire configuration. This termination should
always be set when the unit is set for RS-422, as this is a point-to-point configuration.
If your configuration includes supplying your own external termination, the
termination on the ESP-2 MI hub should not be used.
To disable termination, remove the jumper entirely.
4.
When the RS-485HD interface is enabled in hardware, you will be able to select
the transmitter/receiver mode during startup. For more information on these soft-
ware-configurable options, see Physical Interfaces on page 3.
5.
Replace the cover on the unit and reinstall the four screws.
2.6 Installing the Hub
The ESP-2 MI serial hub may be installed on a table, on a DIN rail or on a wall.
WARNING: The power outlet should be near the equipment and be easily accessible.
You may replace an existing ESP-2 hub with a similarly configured hub without
affecting the server or having to reconfigure the ports.
Installing on a table
The ESP-2 hub ships ready to use in a tabletop environment. This includes four
rubber feet on the bottom of the hub.
Installing on a DIN rail
Equinox offers an Industrial Mounting Kit, part number 790226, containing hardware
and instructions for mounting an ESP-2 MI serial hub on a DIN rail.
Installing on a wall
The ESP-2 MI hub contains two sets of mounting flanges for flexibility in mounting
options on a wall or other vertical surface. You will need to provide the appropriate
number of screws and washers.
•
You may install the hub with the bottom (the side containing the large label)
against the wall, using the four flanges on the bottom of the hub.
The hub ships with rubber feet installed in these flanges for tabletop installation.
Remove them by grasping the bottom of each foot and gently pulling it down and
out of the hole. Then, use your screws and washers to attach the hub to the wall.
Equinox ESP-2 MI Serial Hub Installation and User Guide
7
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