Table of Contents
Advertisement
76
ESP Serial Hub Installer/User Guide
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 hub (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 right 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 left 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.
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 adjacent to the ganged jumper for
the port; see the location noted in Figure B.1.
Termination is enabled by factory default, that is, the jumper covers both pins for each port.
To disable termination, remove the jumper entirely.
See Termination on page 7 for more information.
4.
When the RS-485HD interface is enabled in hardware, you will be able to select the
transmitter/receiver mode. For more information on these software-configurable options, see
RS-485 transmitter and receiver transfer modes on page 7.
5.
Replace the cover on the hub and reinstall the four screws.
Hide quick links:
Advertisement
Table of Contents
