Kontron VMP2 - Manual (Page 56)

VMP2 Configuration
ID 24855, Rev. 02 Page 4 - 4 © 2002 PEP Modular Computers GmbH
4.1.3 Resistor Setting for Non-standard Socket Devices
The default pinout of this socket is designed for use with standard DIL Flashes and M-
Systems DiskOnChip. As some devices have a different pinout, resistors must be set
accordingly (please see figure 2-4 for an illustration of these resistors on the board)
Note: All resistors are 0 ohm
4.1.4 RS485 Termination (Onboard Interface Only)
When the VMP2 is using the onboard RS485 interface and is the last on the RS485 bus,
then the RS485 interface must provide termination resistance. The purpose of J3 is to
enable this line termination resistor (130 R).
Additionally, the correct idle line potential must be provided at one location within the
RS485 bus. J4 and J5 are used for this purpose. Pullup/Pulldown resistors are 380 Ohm
each.
Table 4-2: Resistor Setting for Various Non-standard Socket Devices
Used Socket Devices R3 R6 R7 R8 R11 R12 R13
Flash (default) Open Open Open Set Set Open Set
DiskOnChip (default) Open Open Open Set Set Open Set
NVSRAM Open Open Set Open Set Set Open
4 Mbit EPROM Set Set Open Open Open Open Set
Table 4-3: Jumper Settings for RS485 Termination
Termination J3
ON Set
OFF Open
  Note:
Ensure that the reference potential for the RS485 signals are set
in one location only on the bus.