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Theory of Operation
The command words must be sent to the switch with no more than 10 seconds between
words for the switch to recognize a command. If the interval exceeds 10 seconds, the
M&C resets the word buffer, and waits for the next START word.
If an incorrect word is sent, begin the message sequence again with the START word.
This word restarts the message sequence.
Table 4-6 shows some relay-remote command examples.
Command Word
START
AUTO
REMOTE
B/U MOD 1
B/U MOD 2
B/U DEMOD 1
B/U DEMOD 2
EXECUTE
C = Change of state. N = No change of state.
C = Change of state. N = No change of state.
4–8
Table 4-3. Relay-Remote Command Words
REM3
C
N
N
C
C
C
C
C
Table 4-4. Modem Target Words
Target Modem
REM3
1
N
2
N
3
N
4
N
5
N
6
N
7
N
8
C
SMS-758 Modem Protection Switch
Input Lines
REM2
REM1
REM0
C
C
C
N
C
N
N
N
C
C
N
C
C
C
N
N
N
C
N
C
N
C
N
N
Input Lines
REM2
REM1
REM0
N
N
C
N
C
N
N
C
C
C
N
N
C
N
C
C
C
N
C
C
C
N
N
N
MN/SMS758 Rev. 3
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