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Getting Started
VX4380 256-Crosspoint Relay Matrix Module User Manual
1–7
Configuration
The following switches must be correctly set to ensure proper operation. Refer to
Figure 1–3 for their physical locations.
Each functional module in a VXIbus System must be assigned a unique logical
address, from 1 to decimal 255 (hexadecimal FF). The base VMEbus address of
the VX4380 is set to a value between 1 and hexadecimal FF (FF
16
) by two
hexadecimal rotary switches. Align the desired switch position with the arrow on
the module shield.
The physical address of the instrument is on a 64 byte boundary. If the Logical
Address switch representing the most significant digit (LA-HI) of the logical
address is set to position X and the switch representing the least significant digit
(LA-LO) of the logical address is set to position Y, then the base physical
address of the VX4380 will be [(40
16
× XY
16
) + C000
16
]. For example:
Base Physical Address
L.A.
HI LO decimal hex
A
16
0
16
A
16
(64 * 10) + 49152 = 49792 (40
16
* A
16
) + C000
16
= C280
16
15
16
1
16
5
16
(64 * 21) + 49152 = 50496 (40
16
* 15
16
) + C000
16
= C540
16
LA. is the Logical Address
In order to use and program the VX4380 Module in an IEEE-488 environment
you must know the IEEE-488 address of the module. Different manufacturers of
IEEE-488 interface devices might have different algorithms for equating a
logical address with an IEEE-488 address. Consult the operating manual of the
IEEE-488 Interface Module being used.
Each function module in a VXIbus System can generate an interrupt at a
specified level on the VMEbus to request service from the interrupt handler
located on its commander. Set the interrupt level to the same level as the
interrupt handler on that commander. The VMEbus interrupt level on which the
VX4380 Module generates interrupts is set by a rotary switch. Align the desired
switch position with the arrow on the module shield.
Valid VMEbus Interrupt Level Select switch settings are one through seven, with
setting one equivalent to level one, and so on. The level chosen should be the
same as the level set on the VX4380 interrupt handler, typically the module
commander. Setting the switch to zero or eight will disable the module inter-
rupts. Do not use switch settings nine through f.
Logical Address Switches
IEEE-488 Address
VMEbus Interrupt Level
Select Switch