Physical Layout
Bengal (VL-EPMe-30) Reference Manual
17
Jumper Blocks
Jumper block V1 is located on the bottom side of the board. The board ships with two jumpers
installed, but only one side of each jumper is placed on a pin of the V1 jumper block. In this
configuration, the jumpers do not connect any signals. They are placed this way in case you need
to configure the COM ports for RS-485 termination.
V1
Jumper
Block
BENGAL_10
1 3
2 4
Figure 10. As-Shipped Jumper Settings
Table 4: Jumper Summary
Jumper
Block
Description
V1[1-2]
COM1 Rx End-point Termination (see page
In
– RS-485 termination
Out
– No termination, RS-232
(default)
Places terminating resistor across COM1 RS-485 TXRX+/TXRX- or RS-422 RX+/RX-
differential pair. Jumper must be out for RS-232 operation.
V1[3-4]
COM2 Rx End-point Termination (see page
In
– RS-485 termination
Out
– No termination, RS-232
(default)
Places terminating resistor across COM2 RS-485 TXRX+/TXRX- or RS-422 RX+/RX-
differential pair. Jumper must be out for RS-232 operation.
Integrator’s Note:
No jumper is required for RS-422. You may use a terminator at the receiver, but it is not required.
A jumper should be used for RS-485 only when the port is used as an endpoint.
