Viking DVA-500A Technical Practice page 3

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. Place the DIP switches in the desired settings, then momentary power down the DVA-500A.
Protocol Sw 1
A OFF
B OFF
C ON
1. "On Demand". Set dip switches to protocol "A" (Sw 1 and Sw 2 - OFF).
Contact from PABX
GND pin 6 on DVA-500A
Busy output
from DVA-500A
Earth
GND
2. Type 5 E & M, wink start. Set dip switches to protocol "B" (Sw 1 - OFF, Sw 2 - ON).
Contact from PABX
GND pin 6 on DVA-500A
Busy output
from DVA-500A
Earth
GND
3. Drum Recorder Replacement. Set dip switches to protocol "A" (Sw 1 and Sw 2 - OFF).
GND pin 6 on DVA-500A
Busy output
from DVA-500A
Earth
GND
4. Single Play On Demand. Set dip switches to protocol "C" (Sw1 - ON, Sw 2 - OFF).
Contact from PABX
GND pin 6 on DVA-500A
Busy output
from DVA-500A
Earth
GND
*NOTE: BOM = "Beginning Of Message" pulse. EOM = "End Of Message" pulse.
Sw 2 Switch Position
OFF ON
3
OFF
ON
ON
OFF 4
OFF
Pin 5
Start
Idle/open
Pin 2
Idle/closed
In Use
Pin 5
Start (M)
Idle/open
Pin 2
Wink (E)
Idle/closed
Pin 5
Start
600ms (Programmable)
Pin 2
Announcement
B
O
M
*
Pin 5
Start
Idle/open
Pin 2
Idle/closed
In Use
Description
Inverted Start
ON
Normal
Inverted Busy
OFF
Normal
250ms minimum
250ms maximum
Announcement Duration
600ms (Programmable)
B
Announcement
O
M
*
Announcement
B
O
M
*
250ms maximum
Announcement
E & M
USE ONLY LISTED
PROTOCOLS
CLASS 2 POWER
SOURCE
12V --------
0.5 A MAX
1 2 3 4
Viking Electronics, Inc., Hudson, WI 54016
1 2 3 4
GND (+)
M Lead (Start)
Open
GND (+)
E Lead (Busy)
Open
GND (+)
M Lead (Start)
Open
GND (+)
E Lead (Busy)
E B
O O
Open
M M
* *
GND (+)
M Lead (Start)
(Connected to
earth GND)
GND (+)
E Lead (Busy)
B
O
Open
M
*
GND (+)
M Lead (Start)
Open
250ms minimum
GND (+)
E Lead (Busy)
Open
600 OHM CO/PABX
E & M LINE
3