Scanivalve MPS4232 - MPS4200 Buffer Description; MPS Network Configurations; Isolated Network; Integrated with System Network

33
MPS4232
Section 5: Software

The ring buer on the MPS4200 sits between the scan task and the binary output task. It is 32768 elements in size with each
element holding 160 bytes, making the total ring buer 5,242,880 bytes. At 1000Hz, the MPS can buer approximately 32.7
seconds of data (32768 / 1000). The binary output task has a lower priority than the scan task. This is necessary so that input
scan data is not missed.
The buer is the liaison between the scan task and the scan output task. The scan output task has a higher priority than the
scan task. Under inial condions, when the buer is empty, the scan task places one frame of data in the buer. It then
signals the scan output task to read the buer unl it is empty. However, when mulple frames of data are in the buer, the
output task connues unl the buer is empty. Mulple frames of data will accumulate if the scan output task is blocked by
the network while outpung data.

The MPS may be congured in three basic network arrangements:

The isolated MPS network provides the fastest possible data throughput because other network trac has been eliminated.
MPS commands are issued from the network client/host and data is directed to the network client/host in user-congured
format. This conguraon is ideal for high speed data transfer with data reducon that is handled by the network client/
host.

The integrated MPS provides the most accessible data to all network clients. Any client/host on the network may control any
or all of the MPS’s. Depending on the data transfer protocol, network throughput may be reduced because of other network
trac. This conguraon is ideal for systems that can tolerate slower data transfer rates but require easy access by mulple
client/hosts to each MPS unit.

The MPS sub-network allows high speed data transfer of the sub-network while allowing access by a larger network. The
gateway is most eecve as a mul-homed client/host that can store the MPS data for later access by client/hosts on the
main system network.

When requested the MPS sends an applicaon packet to the client. Each packet sent to the client starts with a Packet Type
Word. This word denes the packet type. All packet data will be received as signed.

FUNCTION BYTES DATA TYPE DESCRIPTION
ASCII command data. Refer to the command
secon of this manual for more informaon.
1 to 80 String
Unique to packet.
Each line/command must
be terminated with a <CR>,
<CR-LF> or <LF-CR>

FUNCTION BYTES DATA TYPE DESCRIPTION
ASCII data*. Refer to the Command Secon of
this manual for the proper Command return
formats.
1 to 1492 String Unique to packet and varies.