Pressure Systems, Inc. 98RK-1 & 9816 User’s Manual©
Page 61 www.PressureSystems.com
Command 'c'— Sub-command Index 00: Configure a Host Delivery Stream
This sub-command is used to configure the 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)
may be started and stopped with other sub-commands. The sub-command’s format is:
Command
“c 00 st [[[[p]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).
‘ ppppp’ is a 1-5 digit hex position field (channel selection bit map),
capable of selecting 1-18 external/internal channels.
‘ sync’ is sync type (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 stream
(0=unlimited/continuous).
NOTE: all parameters are separated by a space.
Response “A”
‘A’ is the acknowledge letter
Autonomous
Packet none generated
Description: Configures a particular stream (‘ st’) to deliver data packets autonomously to the
Configures a particular stream (st) to deliver data packets autonomously to the
host, with each packet containing selected acquired data for the channels
specified. These channels are specified by a bit map (4-20-bits) encoded as a 1-
5 hex digit position field (ppppp as described in Section 3.1.3.3). 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
never executed for 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.
When the hardware trigger is used to synchronize data output (sync = 0), it is
assumed that the user would prefer to also synchronize the internal data
acquisition cycle. For this reason, when a stream utilizing hardware trigger is
started, the module firmware switches out of the free-running continuous data
acquisition mode described earlier. Instead, the Model 9816 waits in an idle
mode until a hardware trigger is received to initiate a host stream output. Only
on the receipt of that hardware trigger will the module scan and EU convert all