Comtech EF Data SMS-458B User Manual

Page 67

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SMS-458B Modem Protection Switch

Revision 2

Theory of Operation

MN/SMS458B.IOM

4–7

Table 4-1. Relay-Remote Command Words

Input Lines

Command Word

Rem3

Rem2

Rem1

Rem0

AUTO

N

N

C

N

REMOTE

N

N

N

C

B/U MOD 1

C

C

N

C

B/U DEMOD 1

C

N

N

C

START

C

C

C

C

EXECUTE

C

C

N

N

Notes:

1.

C = Change of state.

2.

N = No change of state.

Target words are defined in Table 4-2.

Table 4-2. Modem Target Words

Target
Modem

Input Lines

Rem3 Rem2 Rem1 Rem0

1 N N N C
2 N N C N
3 N N C C
4 N C N N

Notes:

1.

C = Change of state.

2.

N = No change of state.