VXI VM4016 - Manual (Page 16)

VXI Technology, Inc.
16 VM4016 Preparation for Use
S ETTING THE C HASSIS B ACKPLANE J UMPERS
Please refer to the chassis User’s Manual for further details on setting the backplane jumpers.
S ETTING THE L OGICAL A DDRESS
The logical address of the VM4016 is set by a single 8-position DIP switch located near the
module’s backplane connectors (this is the only switch on the module). The switch is labeled with
positions 1 through 8 and with an ON position. A switch pushed toward the ON legend will
signify a logic 1; switches pushed away from the ON legend will signify a logic 0. The switch
located at position 1 is the least significant bit while the switch located at position 8 is the most
significant bit. See Figure 2-1 for examples of setting the logical address switch.
SET TO 4
1
ON
2 3 4 5 6 7 8
SET TO 168
1 2 3 4 5 6 7 8
SET TO 8
1
ON
2 3 4 5 6 7 8
SET TO 255
1
ON ON
2 3 4 5 6 7 8
1
2
3
4
5
6
7
8
Switch
Position
1
2
4
8
16
32
64
128
Switch
Value
ON ON
(Dynamic)
F IGURE 2-1: L OGICAL A DDRESS S WITCH S ETTING E XAMPLES
The VMIP may contain three separate instruments and will allocate logical addresses as required
by the VXIbus specification (revisions 1.3 and 1.4). It is necessary that the address of the first
instrument (the instrument closest to the top of the module) be set at an address which is divisible
by 4 and not set to 0. Switch positions 0 and 1 must always be set to the OFF position. Therefore
only addresses of 4, 8, 12, 16 ... 252 are allowed. The address switch should be set for one of
these legal addresses and the address for the second instrument (the instrument in the center
position) will automatically be set to the switch set address plus one; while the third instrument
(the instrument in the lowest position) will automatically be set to the switch set address plus two.
If dynamic address configuration is desired, the address switch should be set for a value of 255.
Upon power-up, the slot 0 resource manager will assign logical addresses to each instrument in
the VMIP module.
F RONT P ANEL I NTERFACE W IRING
The VM4016’s interface is made available on the front panel of the instrument. The 16-channel
version (VM4016-1) will have J201 that contains all signals for this instrument. The 32-channel
version (VM4016-2) will have J201 and J202 provided, while the 48-channel version
(VM4016-3) will have J200, J201, and J202. The wiring for each of these connectors is identical
and since each group of 16 channels is treated as a separate instrument, the module will have three
Channel 1s, three Channel 2s, three Channel 3s, etc.