The ICD-GPS-153C protocol defines the format of these messages. The Current
Status and Time Transfer are sent once per second (1Hz). The Buffer Box is sent
once every 6 seconds (1/6 Hz).
The purpose of these three messages is to emulate a SINCGARS interface con-
nection to a SAASM GPS. VersaSync generates these messages emulating the
Time and 1PPS transfer behavior of the SINCGARS interface. An external device
compatible with the SINCGARS interface can attach to an ASCII Output from Ver-
saSync and receive time and 1PPS as if communicating with and ICD-GPS-153C
compatible SAASM GPS.
These commands are emulated only and contain only time information; position
and velocity information is zeroed out. No controlled data is included in the mes-
sages, hence no SAASM GPS receiver is required.
The ASCII Output supports two configurations for supporting SINCGARS:
A configuration of Time Transfer as Message Format1 and Current Status as
Format2 causes the SINCGARS protocol to be emulated and the machine state
to be initializated.
Format1: Time Transfer (5101)
Format2: Current Status (5040)
Format3: Buffer Box (253)
A configuration of Current Status as Message Format1 and Time Transfer as
Format2 results in broadcasting of the messages Current Status (1Hz), Time
Transfer (1Hz), and Buffer Box (1/6Hz) at their default rates.
Format1: Current Status (5040)
Format2: Time Transfer (5101)
Format3: Buffer Box (253)
5.3.17 EndRun Formats
The following formats provide compatibility with EndRun technology.
368 VersaSync User Manual
APPENDIX
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