Pressure Systems 9022 - Manual (Page 63)

Pressure Systems, Inc. NetScanner™ System (9016, 9021, & 9022) User’s Manual
www.PressureSystems.com 3 - 33
Command ‘c’— Sub-command Index 00: Configure A Host Delivery Stream
This sub-command is used to configure the principal parameters of each of the three possible
concurrent host delivery streams, one at a time. Following this configuration phase, the stream (1,
2, or 3) or all streams may be started and stopped with other sub-commands. The sub-command’s
format is:
Command “c 00 st [[[[p]p]p]p sync per f num”
‘c’ is the command letter
‘00’ is the sub-command index (ii) for configuration
‘st’ is the stream id digit (1, 2, or 3)
‘[[[[p]p]p]p’ is a 1-4 hex digit position field (channel selection bit
map) capable of selecting 1-16 internal channels
‘sync’ is sync type character (0= hardware trigger or 1= clock)
‘per’ is the period (if sync=0: # of trigger periods or if sync=1: delay
timer period in msec).
‘f’ is the format of each acquired datum in stream
‘num’ is the number of packets delivered in the stream
(0=unlimited/continuous).
NOTE: all parameters are separated by a space character.
Response “A”
‘A’ is the acknowledge letter
Autonomous
Packet
none generated
Description: Configures a particular stream (‘st’) to deliver data packets autonomously to the
host, with each packet containing selected acquired data for the channels specified.
The channels are specified by a standard 16-bit position field bit map (encoded as
a 1-4 hex digit position field ([[[[p]p]p]p). A separate sub-command (ii=05) may be
used to select which acquired data are included in each stream. By default, only
pressure (EU) data are selected (if ii=05 sub-command is never executed for the
stream).
The individual data packets of the stream may be synchronized with either an
external user-supplied hardware trigger or a periodic clock interrupt generated inside
each module. This choice is made with the sync type ‘sync’ parameter (a single
digit) where: 0 = synchronize with hardware trigger; 1= synchronize with periodic
software clock.