one male DB-9 RS-232 input connector (J2),
and one female DB-9 RS-232 output connector (J1)
The ASCII Time Code Option Card, Model 1204-04 (RS-485) consists of one RS-485 input, and
one RS-485 output, integrated in a shared terminal block connector.
The interfaces accept Asynchronous Serial signals including date and time information. The
input and output Data Formats are selected among predefined formats.
ASCII input
The ASCII input provides a serial data interface between an ASCII time generator (e.g.,
another SecureSync unit), serving as an input reference for Time and 1PPS in order to syn-
chronize SecureSync (in conjunction with, or in lieu of, other available inputs, such as GNSS
and/or IRIG).
ASCII output
The ASCII output provides SecureSync with the ability to output one, two or three back-to-back
ASCII time code data streams that can be provided to peripheral devices which accept an
ASCII RS-232 input data stream for either their external time synchronization or for data pro-
cessing. See "Time Code Data Formats" on page518 for a description of all supported time
code formats.
The RX signal on an output interface is used for triggering the output ASCII message output
when a configured character is received from the peripheral device.
When SecureSync is configured to output only one format message (the second and third
formats configured as “None”), the one configured message will be available on the output
port as either a broadcast message or only upon a request character being received.
SecureSync has the ability to output one or two additional data stream messages immediately
following the first message. In this configuration, only the first message determines the on-time
point for the entire output string. The on-time points for the second and third messages that are
provided at the same time as the first message are discarded. This unique capability allows
SecureSync to be able to simultaneously provide multiple pieces of data from different selected
format messages.
An example of selecting multiple formats is selecting “NMEA GGA” as the first format, “NMEA
RMC” as the second format and “NMEA ZDA” as the third format. Depending on the setting of
the “Mode” field (which determines if the data streams are available every second or upon a
request character being received), at the next second or the receipt of the next request char-
acter, the output port will provide the GGA message followed immediately by the cor-
responding RMC message for that same second, followed immediately by the corresponding
ZDA message for that same second. The first GGA message will provide the on-time point for
the entire output data stream.
456 SecureSync User Reference Guide
APPENDIX
To Next Page
Loading...
Need help?
General
