ASTi Telestra User's Guide download pdf (Page 155)

ASTi Telestra User Guide (Ver. 3, Rev. G.1)

Appendix C: HF Server ICD

This appendix provides the speciﬁcation for the software interface between the HF Server and the

simulation host computer. The HF Server is provided with certain conﬁguration data, on a per-

exercise basis, via an ethernet packet. The host software provides the input data to the HF Server

in the format speciﬁed in this ICD.

Data is provided to the HF Server via an ethernet connection between the host computer and the

HF Server. This connection need not be dedicated, but may be part of the Local Area Network

infrastructure. Packets are standard IEEE 802.3 format using a UDP-level protocol. The HF

Server is set up to receive host conﬁguration packets on UDP Port # 33000 by default.

Typically, this interface would be used in the beginning of an exercise to initialize the HF Server

parameters. Once the parameters for a particular exercise have been set, they will remain constant

until the host sends another packet to overwrite them. Note that the HF Server stores exercise-spe-

ciﬁc data. Multiple, independent exercises can run simultaneously using the same HF Server.

Input Control Data Types

In_Bool

Boolean parameter. Data word is a single bit wide only - no other bits are checked within a word.

Speciﬁc bit location is speciﬁed in the Bit ﬁeld in Table 18.

In_Uint

Unsigned Integer parameter. Data word can be of variable length, as speciﬁed by the Start and

End ﬁelds in Table 18. All data is in network-byte order.

In_Float

Floating point input. Data word is in IEEE ﬂoating point format and is 4 bytes wide.

Table 19: HF Server ICD

* OFFSET is the time difference, in hours, between the clock on the HF Server (system time in

GMT) and simulation time, expressed in GMT. This can be a negative number.

Note: HF ICD Messages must be exactly 21 bytes long.

Variable Type Description Port # Start End Bit Default

Set_SSN_ﬂag In_Boot True to set current value of

Smoothed Sunspot Number

33000 11 11 0

Set_OFFS_ﬂag In_Boot True to set current value of OFF-

SET*

33000 11 11 1

Exercise ID In_Uint Exercise ID to set parameters (1

to 255)

33000 15 15

SSN In_Uint Current value of Smoothed Sun-

spot Number (0-250 typically)

33000 16 17 100

OFFSET In_Float Current value of OFFSET* (in

hours)

33000 18 21 0.0

1 2 ... 150 151 152 153 154 155 156 157 158 159 160 ... 165 166

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