CHAPTER THREE
SW #1
SW #2
SW #3
MESSAGE RATE
ON (0)
ON (0)
ON (0)
10 TIMES PER SECOND
ON (0)
ON (0)
OFF (1)
ONCE PER SECOND
ON (0)
OFF (1)
ON (0)
ONCE EVERY 10 SECONDS
ON (0)
OFF (1)
OFF (1)
ONCE EVERY 100 SECONDS
OFF (1)
ON (0)
ON (0)
ONCE EVERY 1000 SECONDS
OFF (1)
ON (0)
OFF (1)
ONCE EVERY 1000 SECONDS
OFF (1)
OFF (1)
ON (0)
ONCE EVERY 1000 SECONDS
OFF (1)
OFF (1)
OFF (1)
ONCE EVERY 1000 SECONDS
In the example above, the message rate is once every second.
B.
ASYNCHRONOUS MODE (Switch S4)
When this unit is set up in the asynchronous mode, the time output rates described
in “Synchronous Mode” will be ignored. The user must select an 8 bit character
(any hex value from 00 to FF) as a time demand character. The user sends the
selected character to this unit, which causes a time message to be output in
response.
ON
8
7
6
5
4
3
2
1
S4
SW. #
SW. POSITION DESCRIPTION
1 ON
(0)
ASYNCHRONOUS
OFF (1)
SYNCHRONOUS (DEFAULT)
2
ON (0)
7 BIT WORD
OFF (1)
8 BIT WORD (DEFAULT)
3
ON (0)
FULL HANDSHAKE
OFF (1)
NO HANDSHAKE (DEFAULT)
4 ON
(0)
TEST
OFF (1)
OPERATE (DEFAULT)
In the example above, the Mode is asynchronous, it is an 8 bit word, full
handshake, and in the operate (default) mode.
3-44
TM7000 TymMachine TCG/T (Rev D)
Symmetricom, Inc.
