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Pressure Systems, Inc. 98RK-1 & 9816 User’s Manual©
Page 39 www.PressureSystems.com
The above correction coefficients are maintained internally in IEEE floating-point format. The
Read Internal Coefficients ('u') command and the Download Internal Coefficients ('v')
command can return (or manually set) calibration coefficients to the host in decimal or hex
dump formats in their responses.
3.1.5.4 Delivery of Acquired Data to Host
Several commands apply to host delivery of acquired data, either on demand or autonomously.
For all Ethernet models, the Read High Precision Data ('r') command may be used to obtain
high precision data (in various formats). In addition, Model 9816 provides several high speed,
high resolution output commands. The Read High-Speed Data ('b') command is used to read
“pure binary” engineering unit pressure (all 16 channels are returned in the lowest overhead
format). Use the 'r' and 'b' commands to get acquired data on demand.
The module can also deliver EU pressure data in streams, which consist of TCP/IP data packets
that arrive autonomously in the host (with data from selected channels being delivered in
various formats at various rates). Up to three independent streams (or time classes) may be
configured, started, stopped, and cleared with the Configure/Control Autonomous Host
Streams ('c') command. In conjunction with hardware triggering, this autonomous delivery
method can also make the module acquire (as well as deliver) data in its most efficient and
time-synchronized manner. This also frees the host to receive/process/record these data in its
most efficient manner, since it need not waste time continually requesting new data.
Model 9816 also has special purpose on demand data acquisition commands, including: Read
Transducer Voltages ('V') and Read Transducer Raw A/D Counts ('a'), which provide two
views of raw pressure data. It has similar commands providing EU temperature (C) and other
raw views of each channel’s special temperature signal, including Read Transducer
Temperatures ('t'), Read Temperature A/D Counts ('m'), and Read Temperature Voltages
(
'n'). This command group is generally used for diagnostic purposes. All of these special
purpose data (plus other module status information) may also be periodically delivered to the
host automatically in any of the three flexible autonomous streams configured by the 'c'
command.
3.1.5.5 Network Query and Control Functions
A special subset of three (3) UDP/IP commands may be sent to a module at any time power is
applied to it (i.e., neither a host socket connection nor a unique IP Address assignment is
required). Each such command is broadcast to all modules (i.e., sent to IP Address
255.255.255.255) via Port 7000, and any module wishing to respond will return a response via
Port 7001.
Only one of these commands returns a response. This is the Network Query ('psi9000')
command. The others cause the module to be re-booted, therefore no response is possible.
One command changes the way the module gets its IP address assignment (i.e., dynamically
from a server or statically from factory-set internal data).