B. E & M Protocol Settings and Timing Specifications
Three different protocol settings are switch selectable for
changing E&M timing plus the ability to invert the start
and/or busy signals. Each channel is set up separately.
Protocol
A
B
C
Sw 1
OFF
OFF
ON
Sw 2
OFF
ON
OFF
1. “On Demand”. Set dip switches to protocol “A” (Sw 1 and Sw 2 - OFF).
Pin 6 or GND screw
terminal
Earth
GND
Contact from PABX
Pin 5
Start
250ms minimum
Idle/open
GND (+)
M Lead (Start)
Open
Busy output
from DVA-1003B
Pin 2
Idle/closed
In Use
250ms maximum
GND (+)
E Lead (Busy)
Open
Announcement Duration
B
O
M
*
3
-48v GND
CO/PABX
LINE
600 ohm
E & M
CHANNEL 3
E & M
Protocols
1 2 3 4
USE ONLY
LISTED
CLASS 2
POWER
SOURCE
12V xx xx
0.5 A MAX.
1 2 3 4
ON
OFF
Switch Position Description
Inverted Start
Normal
Inverted Busy
Normal
3
ON
OFF
ON
OFF
4
*Note: BOM = “Beginning Of Message” pulse. EOM = “End Of Message” pulse.
Note: Set switches with the unit powered down.
2. Type 5 E & M, wink start. Set dip switches to protocol “B” (Sw 1 - OFF, Sw 2 - ON).
Earth
GND
Contact from PABX
Pin 5
Start (M)
Idle/open
GND (+)
M Lead (Start)
Open
Busy output
from DVA-1003B
Pin 2
Wink (E)
600ms (Programmable)
GND (+)
E Lead (Busy)
Open
Announcement
Idle/closed
E
O
M
*
B
O
M
*
Pin 6 or GND screw
terminal
Earth
GND
Pin 5
Start
GND (+)
M Lead (Start)
(Connected to
earth GND)
Busy output
from DVA-1003B
600ms (Programmable)
GND (+)
E Lead (Busy)
Open
Announcement
B
O
M
*
B
O
M
*
3. Drum Recorder Replacement. Set dip switches to protocol “A” (Sw 1 and Sw 2 - OFF).
Announcement
B
O
M
*
Pin 2
Pin 6 or GND screw
terminal
4. Single Play On Demand. Set dip switches to protocol “C” (Sw1 - ON, Sw 2 - OFF).
Earth
GND
Contact from PABX
Pin 5
Start
Idle/open
GND (+)
M Lead (Start)
Open
Busy output
from DVA-1003B
Pin 2
Idle/closed
In Use
250ms maximum
GND (+)
E Lead (Busy)
Open
Announcement
250ms minimum
Pin 6 or GND screw
terminal
