Measurement Specialties 9116 - Manual (Page 70)

Pressure Systems, Inc. Model 9116 User’s Manual
Page 61 www.PressureSystems.com
Command ‘c’ — Sub-command Index 06: Select Protocol For Stream Delivery
Command “c 06 st pro [remport [ipaddr]]”
‘c’ is the command letter.
‘ 06’ is the sub-command index (ii) for Select Protocol.
‘ st’ is the stream id digit (0=the ONLY acceptable entry).
‘ pro’ is the protocol id digit (1=UDP/IP, 0=TCP/IP)
‘ remport’ is an optional remote port number to which each UDP stream is
directed in the host (port 9000 is the default if unspecified). It is ignored if
pro=0.
‘ ipaddr’ is an optional host IP address to which each UDP stream is
directed (default is the host IP address per current TCP connection that
sent this command). It is ignored if pro=0.
NOTE: all parameters separated by a space.
Response
“A”
‘A’ is the acknowledge letter
Description: This command sets the protocol by which every configured autonomous stream
is delivered to the host. It must be executed after streams are configured,
but before they are enabled.
By default, streams are delivered via the same TCP/IP protocol used to receive
commands from host (i.e., via the existing TCP/IP connection used to send this
command). However, for special circumstances, all autonomous streams may
be delivered to the host via the UDP/IP protocol instead. This command is
required only when UDP/IP is to be used. It also can restore the default protocol
(to TCP/IP) once it has been changed. The TCP/IP version of the command
ignores the optional (pro and ipaddr) parameters, which have meaning only to
the
UDP/IP protocol.
Though the command has a stream parameter, it is currently limited to changing
the
protocol of all defined streams at the same time (i.e., parameter st must be =
0, meaning all configured streams).
The
optional remport parameter may be any value in the range 1024 to 65535.
However, remport = 7001 should be avoided, since NetScanner modules emit
UDP Query responses to that port, and most host programs should have a UDP
socket already bound to that port for receiving these special responses. The
choice of remport parameter will affect the way host software must handle
multiple modules sending streams. If every module uses the same port, then a
single host socket can be bound to that port to receive all responses from all
modules. The remote IP address, given to that socket, at time of receipt of the
stream’s datagram, will identify the particular module who sent the datagram.
Alternately, every module may be given a unique remport number, requiring that
a host program bind a unique UDP socket to each of these unique remport
numbers. Then, when a particular socket receives a UDP datagram to its unique
port, the module sending it is automatically identified.