Hardware Manual - RTD Embedded Technologies, Inc.

Base Address Jumper (Factory Setting: 300 hex, 768 decimal)
One of the most common causes of failure when you are first trying your module is address contention. Some of
your computer’s I/O space is already occupied by internal I/O and other peripherals. When the module attempts
to use I/O address locations already used by another device, contention results and the board does not work.
To avoid this problem, the DM6425HR has an easily accessible jumper (J7) that lets you select any one of 16
starting addresses in the computer’s I/O. If the factory setting of 300 hex (768 decimal) is unsuitable for your
system, you can select a different base address simply by setting the jumper to any one of the values listed in
Table 4. The table shows the jumper settings and their corresponding hexadecimal and decimal (in parentheses)
values. Be sure to verify the order of the numbers on the jumper (1 through 4) before setting them. When you
set the base address for your module, record the value on the back cover of this manual. Figure 9 shows the BASE
ADDR jumper (J7) set for a base address of 300 hex (768 decimal).
Note In Table 4, 0 = closed or down, corresponding to a logical “0”, and 1 = open or up, corresponding to
a logical “1”. The factory default base address is shaded.
Table 4
DM6425HR dataModule Base Address Jumper Settings
Base Address
Hex/(Decimal)
Jumper Settings
4 3 2 1
Base Address
Hex/(Decimal)
200/(512) 0 0 0 0 300/(768) 1 0 0 0
220/(544) 0 0 0 1 320/(800) 1 0 0 1
240/(576) 0 0 1 0 340/(832) 1 0 1 0
260/(608) 0 0 1 1 360/(864) 1 0 1 1
280/(640) 0 1 0 0 380/(896) 1 1 0 0
2A0/(672) 0 1 0 1 3A0/(928) 1 1 0 1
2C0/(704) 0 1 1 0 3C0/(960) 1 1 1 0
2E0/(736) 0 1 1 1 3E0/(922) 1 1 1 1
Jumper Settings
4 3 2 1
1
2
3
4
Figure 9 Base Address Jumper (J7)
(shown in the factory default setting)
BDM-610010034 Rev C Chapter 2: DM6425HR Module Settings 17