Technical data

210 Agilent Connectivity Guide
8 Glossary
side-by-side
A side-by-side installation allows two vendors' implementations of
VISA to be used on the same computer. See also primary VISA and
secondary VISA.
SRQ
An IEEE-488 Service Request. This is an asynchronous request (an
interrupt) from a remote device that requires service. In GPIB, an
SRQ is implemented by asserting the SRQ line on the GPIB. In VXI,
an SRQ is implemented by sending the Request for Service True
event (REQT).
status byte
A byte of information returned from a remote device that shows the
current state and status of the device. If the device follows IEEE-488
(GPIB) conventions, bit 6 of the status byte indicates whether the
device is currently requesting service.
subnet
A portion of a network that shares a common address component. On
TCP/IP networks, subnets are defined as all devices whose IP
addresses have the same prefix. For example, all devices with IP
addresses that start with 100.100.100. would be part of the same
subnet. Dividing a network into subnets is useful for both security
and performance reasons. IP networks are divided using a subnet
mask.
subnet mask
A mask used to determine to what subnet an IP address belongs. An
IP address has two components: the network address and the host
address. For example, consider the IP address 150.215.017.009.
Assuming this is part of a Class B network, the first two numbers
(150.215) represent the Class B network address and the second two
numbers (017.009) identify a particular host on this network.
Subnetting enables a system administrator to further divide the host
part of the address into two or more subnets. In this case, a part of the
host address is reserved to identify the particular subnet.