Manual LPCI-COM-8SM
14
Other jumpers
1) RS 485 (2 wire mode) - Two jumpers must be installed for each channel in this mode in order
to connect the output and input lines. These jumpers are located near the cable connector and
are labeled with the channel letter and “485.”
2) RS 485 (2 wire mode) using “Auto RTS” - One jumper must be installed for each channel in
this mode. This jumper is located at the end of the card away from the cable connector,
adjacent to the “M” jumpers and are labeled with the channel letter and “A8".
3) RS 485 or RS 422 Loads - One jumper must be installed for each channel which requires a
load. This jumper is located at the cable connector end of the card and is labeled with the
channel letter and “LD.”
Notes
:
1) Any unneeded jumpers that are installed can cause the card to function incorrectly.
2) If the “Auto RTS” jumpers are changed, the card should be rebooted or reset. This is required
because the status of the jumpers is read when the card is reset and is used to program the
Auto RTS function into the appropriate channel(s) of the UART. If the state of this jumper is
changed, the UART will not be properly programmed until the jumper has been reread. To do
this, the card must be reset.
