Owner`s manual

122
14.3.1 V87 SERIAL INTERFACE SELECTION
The desired serial interface is selected by positioning
jumpers on the main board of the module for each
individual port. Please refer to Section 14.2.3 (V75 EIA-
422 Cabling) for cabling information if using EIA-422
serial interface (default). If you wish to change one or
more of the ports to operate using a different serial
interface, please use the following procedure:
a. IMPORTANT: If the V87 module is installed in the
base unit chassis, remove power from the unit by
positioning the On/Off switch to "0" (off) and
unplugging the power cord from the AC outlet.
Remove the module by unscrewing the two
straight slot screws securing it to the back panel
and pulling the module out.
b. Refer to Figure 39 on the following page and
locate the four six-position jumper locations for
serial interface selection. The jumper locations
are marked on the assembly drawing for serial
interface selection as JP5 for Port 1, JP8 for Port 2,
JP11 for Port 3, and JP14 for Port 4.
c. Each port is configurable for EIA-422 or EIA-485
serial interface by installing a four-position jumper
to either the 422 or 485 position as marked on the
board. The center row of pins for each port are
occupied by two of the jumper positions and the
row of pins for either 422 or 485 are occupied by
the other two positions of this jumper.
NOTE: A termination resistor is installed by
default. You can remove the termination resistor
for each individual port by moving JP4, JP7, JP1, or
JP13 away from the R/T position for Ports 1, 2, 3,
or 4 respectively.