Lbus Lockout Keys; Figure 2-6 Lbus Lockout Keys - Racal Instruments 1260 Series User Manual

1260 Series User Manual
LBUS Lockout
Keys
The VXIbus defined LBUS lockout keys are designed to prevent
the connection together of incompatible logic families. They are
attached to the exterior of the module at the top of the front panel.
Note: The 1260 Master must occupy the leftmost slot in the series.
It is not required to occupy the leftmost slot in the chassis.
Note all modules shipped from the factory are supplied with three
keys. Because their use is application dependent, it is the users
responsibility to configure each module with the correct lockout key
unless they are ordered specifying the modules that are to be the
leftmost (Master) module, the rightmost module in the group, and
the modules between the leftmost and rightmost modules.
Refer to Figure 2-6 which illustrates the three LBUS Lockout keys
used, and to Figure 2-7 which shows a 1260 Master/Slave
configuration.

Figure 2-6 LBUS Lockout Keys

Racal Instruments implements the LBUS lockout scheme in one of
three ways for each module as follows:
VXIbus Defined "C" Key
The LBUS Lockout key (Racal Instruments P/N 455541) is fitted to
the leftmost module in the group, i.e., the 1260 Master.
connected to the LBUS to the right of the module, and the
connection is TTL-compatible.
VXIbus Defined "A" Key
The LBUS Lockout key (Racal Instruments P/N 455542) is fitted to
the rightmost of the modules installed in a VXIbus chassis. It is
connected to the LBUS to the left of the module, and the
connection is TTL-compatible.
VXIbus Defined "A/C" Key
Installation Instructions 2-7
It is