Technical data

ASTi Telestra MBV Quick Start Guide (Ver.2 Rev. C)

3.2. Mapping The UDP Packets

If you are planning on using a host computer to populate the ﬁelds of the UDP packet, you will

need to map the UDP packet asset in the model to an IP address and a port.

1. In RMS, navigate to

Models > Host Interface

. Here you will see 4 ﬁelds. The IP address

drop down box lists the IP address of the 3 Ethernet ports on the Telestra.

2. Choose one IP address to assign to the model UDP Packet.

3. The Port number defaults to 10000. You can set this to any valid port number.

4. The Endianess defaults to big, you can choose to have it little if that is how your host will

pack the UDP packet.

5. The last ﬁeld is the Periodicity. Each Host In and Host Out packet interface has an associ-

ated timer. The Periodicity deﬁnes the amount of time which must pass for a timeout to

occur. The behavior is different for Host In vs. Host Out:

Host In:

When a timeout occurs on a Host In interface, this indicates the user’s host computer has

not sent a packet in time. The Telestra then reverts the data to the predeﬁned default values

for all ﬁelds with defaults in the data packet. If the Periodicity is set to zero, a timeout will

never occur. In this case, the Telestra will simply hold the last data values until a new

packet arrives.

Host Out:

When a timeout occurs on a Host Out interface, a new packet is sent from the Telestra to

the user’s host computer. If the Periodicity is set to zero, a timeout will never occur. In this

case a packet is sent every time any of the data (driven by the model) changes. If there is

no change in any of the data ﬁelds, there will not be a packet sent.

For both Host In and Host Out, the units of time are in what we call “ticks” or 10 millisec-

ond increments. For example, 5 ticks at 10 milliseconds = 50 milliseconds = 20 Hz or 20

packets per second.

6. Verify your changes and select the “Change IP Addresses/Ports” button to submit the

changes to the model which reloads the model.