Monroe Electronics 948A - Manual (Page 14)

13
Audio Input Connection:
The audio input is connected at pins '6' and '5' (circuit common). The 3185E is factory set at
10 k
Ω
input impedance; unbalanced. This audio input may be changed by the customer to
have a 600
Ω
termination instead of 10 k
Ω
, and also to be balanced instead of unbalanced.
Consult the CUSTOMER OPTION section for more explanation.
‘Set’ Input Connection:
The ‘Set’ input is connected at pin 'D', and when pulsed to circuit common will energize the
output relay. The output relay will remain energized until the proper 'OFF' code is received or
the ‘Reset’ input is pulsed to ground. This input is level sensitive and requires a minimum
pulse width of 20 msec. to circuit common to activate or de-activate the output relay. The ‘Set’
input has precedence over all functions except ‘Reset’.
If the 3185E's ‘Set’ input is pulsed to circuit common while decoding a code sequence it will
clear previous valid digit(s) decoded after the ‘Set’ input returns to a ‘high’ state.
‘Reset’ Input Connection:
Momentarily connecting pin 'E' to circuit common will cause the 3185E to reset. This input is
level sensitive and requires a minimum pulse of 20 msec. to circuit common to reset the card.
The ‘Reset’ input dominates over all other functions.
NOTE: The 3185E will ignore all commands or code sequences until the ‘Reset’ input is
removed from circuit common.
Relay Output Connections:
The 3185E provides a dual Form C relay output. The output relay will energize whenever the
preprogrammed 'ON' code sequence is received or the ‘Set’ input is momentarily connected to
circuit common. If the output relay is set to ‘momentary’, the output relay will activate
approximately 40ms after the last valid digit is received and stay on as long as the last valid
digit is present. If the output relay is set to ‘latching’, the output relay will remain energized
until the programmed ‘OFF’ code sequence is received or the ‘Reset’ input is momentarily
connected to circuit common.
The dual Form C relay output connections are shown below:
RELAY OUTPUT
COMMON
CONTACT
NORMALLY
CLOSED
CONTACT
NORMALLY
OPEN
CONTACT
1 FORM C 1 9 10
1 FORM C A K L
TABLE 1
Power Supply Input:
The power supply input is connected to pins '8' (+12 VDC) and '3' (circuit common). The
3185E requires a power supply capable of providing 50mA minimum, and regulation of the
+12 volt, ±10 %.