Pressure Systems 9046 - Manual (Page 50)

Pressure Systems, Inc. Model 9046 User’s Manual
Page 44 www.PressureSystems.com
5.7.1 Command ’c’- Sub-command Index 00: Configure a Host Delivery Stream
This sub-command is used to configure the principle parameters of each of the three possible
concurrent host delivery streams, one at a time. Following this configuration phase, the
particular
stream (1, 2, or 3) or all streams (0) may be started, stopped, altered, or undefined,
with other sub-commands. This sub-command’s format is:
Command "c 00 st pppp sync per f num"
’c’ is the operation code
’00’ is the sub-command index (ii) for configuration
’st’ is the stream id digit (1, 2, or 3)
’pppp’ is a 1-4 hex digit position field (channel
selection bit map)
’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 scans delivered in the
stream
(0=unbounded, >0 bounded).
NOTE: all parameters are separated by a space
character.
Response "A" or "Nxx" ’A’ for acknowledge; ’N’ for negative
acknowledge, error code xx.
Autonomous
Packet none generated (until Stream Start sub-command)
Description : Configures a particular stream (‘ st’) to deliver data scans autonomously to the
host, with each scan containing selected acquired data for the channels specified. The channels
are specified by a standard 16-bit position field bit map (encoded pppp as a 1-4 hex digits). A
separate sub-command (ii=05) may be used to select which acquired data groups or prefixes
are included in each stream. By default, only Temperature/Resistance (EU) data group is
selected (if ii=05 sub-command is never executed for the stream after its initializing ‘c 00’ sub-
command).
The generation of individual scans of a stream may be synchronized with either an external
user-supplied hardware trigger or a periodic (1000 Hz) 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 the periodic clock.