Technical data

1260-43 User Manual Publication No. 980673-067 Rev. B
Module Operation 3-2 Astronics Test Systems
matrices (refer to Appendix A.) With the exception of the matrix
output relay groups, each group of relays operating on the buss is
comprised of 10 relays. The matrix output relay groups only
operate on 5 of the 10 signals of the buss and thus have only one
control/status register associated with each group. For the rest of
the relay groups an A and B control/status register pair is assigned
to each group. Only bits 4-0 of the register are used. Bits 7-5 are
not used and will display “111” when the status register is read.
Register ‘A’ is assigned to buss signals 4-0 while register ‘B’ is
assigned to buss signals 9-5.
The control registers are located in the VXI buss A24 Address
Space. The A24 address for a control register depends on:
1. The A24 Address Offset assigned to the 1260-01T module by
the Resource Manager program. The Resource Manager
program is provided by the VXI buss slot-0 controller vendor.
The A24 Address Offset is placed into the “Offset Register” of
the 1260-01T by the Resource Manager.
2. The <module address> of the 1260-
43 module. This is a
value in the range 1 through 12.
3. Each control / status register on the 1260-43 has a unique
address.
The base A24 address for the 1260-43 module may be calculated
by:
(A24 Offset of Option-01T) + (1024 x Module Address of
1260-43).
The A24 address offset is usually expressed in hexadecimal. A
typical value of 204000
16
is used in the examples that follow.
A 1260-43 with a module address of 6 would have the base A24
address computed as follows:
Base A24 Address of 1260-43 = 204000
16
+ (400
16
x 6
10
)
= 205800
16
The control registers for 1260-Series VXI modules are always on
odd-numbered A24 addresses. The first two control registers for
the 1260-43 reside at the first two odd-numbered A24 addresses
for the module:
(Base A24 Address of 1260-43) + 1 = Control Reg. 0
(Base A24 Address of 1260-43) + 3 = Control Reg. 1
So, for our example, the two control registers are located
at: