PSI System Controls and Diagnostics
A500 User Manual
A500_UM_090115 Page 23 of 61
pressure before rotating the bayonet collar. Do not force the connector. If it does not appear to
be inserting correctly, the key is probably misaligned.
There is no constraint on the order in which devices are connected on the communication loops,
or which loop ports on the A500 they are connected to. The Pyramid Technical Consultants, Inc.
PSI Diagnostic host software, and any user software that uses Pyramid DLLs will search all loop
ports for devices. The only thing you must do is ensure that each loop is completed back to the
receiver on the A500, and that each device on a given loop has a unique address switch setting (1
to 15).
The number of loops can be up to five or ten, depending upon the A500 configuration, and each
loop can have up to 15 devices. The more devices that are attached to the loop, the more the data
bandwidth has to be shared between the devices, so in general it is useful to populate the five
loops evenly if data rate is important. The type of front-end device affects the amount of data it
generates, so this must also be taken into consideration too.
Up to five (-R5T5 option) or ten (-T10 option) direct gate output lines can be derived from up to
four gate input signals. If the devices to be gated or triggered are remote from the A500, and if
they all require the same gate/trigger signal, it may be more convenient for cabling to run a
single fiber optic over the long cable run, then fan out the signal near the target devices. The
Pyramid Technical Consultants, Inc. X14 device provides a one to four fanout for this purpose.
Figure 10 illustrates some other system architecture options. One loop of six devices is shown,
but each of these devices has a fast data stream output direct to the A500. This capability is
provided by the D100 pulse processing device for example. Up to ten devices of this type can be
attached to one A500 through the ten channel fiber-optic receiver board (option -10R). Slower
data such as configuration parameters is passed over the communication loop. A second loop
port is used to communicate peer-to-peer with another A500.