Using the Symmetricom Serial Interface Protocol
58 X72 Desiger’s Reference and User’s Guide 097-10603-01 Rev. A – November 2004
Using the Symmetricom Serial Interface Protocol
The Symmetricom Serial Interface Protocol (SSIP) permits external communication
with the X72 through the serial port connector J1 when the unit is connected to a
host PC. All “developer-mode” commands are a single ASCII letter and require no
termination. Of the eight RUN MODE commands, three require the host to supply
data.
Host Terminal Emulator Setup
Set up the comm port of the PC with the following configuration:
Data rate (baud or B.P.S. – baud rate) of the X72 is 57.6K
No parity
8 data bits
1 stop bit
No local echo (unit echoes)
No hardware or software flow control
Data Format
Run Mode Data Format (Customer Mode)
X72 outputs are all decimal data as “ASCII Coded Hex” except for echoed
characters. Do not convert data to decimal when transmitting to the X72. All data
are sent to the X72 and received back as “ASCII Coded Hex”. The following
example shows how data are encoded.
Data sent to the X72 in run mode should not be encoded.
Note: The X72’s UART connections are based on 5 Vdc logic levels.
However, the Developer’s Kit contains a TTL-to-RS232 converter that
allows interfacing to a PC.
Note: Flow control is not permitted in “Run Mode”.
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