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 connection to a
SAASM GPS. SecureSync generates these messages emulating the Time and 1PPS transfer
behavior of the SINCGARS interface. An external device compatible with the SINCGARS inter-
face can attach to an ASCII Output from SecureSync and receive time and 1PPS as if com-
municating 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 messages, 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)
5.4.16 EndRun Formats
The following formats provide compatibility with EndRun technology.
5.4.16.1 EndRun Time Format
E x a m p l e m e s s a g e :
T YYYY DDD HH:MM:SS zZZ m<CR><LF>
Where:
SecureSync User Reference Guide 541
APPENDIX
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