Specifications

3000 series eurocard switchers.ib.rev21.doc Page 24 of 36 16/10/2007
Wire per crosspoint operation
In most cases, the BCD encoded remote control system offers the most satisfactory way of controlling one or more
switchers. There are however, situations where it is necessary to provide a wire per crosspoint access for control and
/ or a line per crosspoint tally system.
Both of these facilities may be made available on the 3000 series in a number of ways.
3011 Series:
The AVS-3011, AAS-3021, DDS-3031 and DVS-3041 supersede the earlier models and provide an on board
patching area for changing the switcher from BCD to WPX input using the PL 4 & PL 5 connectors.
To change to WPX mode the WPX links should be installed on the PCB where indicated on the PCB overlay and all
of the "Universal" links should be removed or cut.
A momentary contact closure to ground on the relevant control input will now cause the switcher to operate in the
same way as it would had the switch on the local control panel type CPS-3050 been depressed.
Pin connections are as follows:
PL 4 PL 5
1A +12 Vdc out. N/C.
1B Ground. Ground.
2A Switch 5 contact. Switch 5 contact.
2B Switch 4 contact. Switch 4 contact.
3A Switch 3 contact. Switch 3 contact.
3B Switch 2 contact. Switch 2 contact.
4A Switch 1 contact. Switch 1 contact.
4B N/C. Vert. out
5A N/C. N/C.
5B N/C. N/C.
No complicated logic is required of a remote control to the switcher in this configuration and the CP-700 five-
button remote control connector may be used to operate the switcher or a custom switch panel may be fabricated.
If the CP-700 is used to operate the switcher the LED's for tally will be inoperative and the + Volts connection on
the CP-700 should not be connected.
The primary disadvantage of this method is that no tally is available on the switch lines.
3010 series:
The 3000 series switchers initially provided WPX control by:
1. Direct connection to the switch contact and LED connections provided for use with a local
control panel.
2. Connection by external BCD encoding.
These are described below.
Each switcher and the remote control panel is equipped with a 12 way in line connector at the front of the board for
connecting to the switch panel. This connector carries signals for each switch contact and the LED tally indication
from the switch control logic.
Switch control lines are normally held high by 10 KΩ resistors in a resistor array. The switch action momentarily
grounds this control line and this is the action that should be mimicked by an external control. Link LK 3 which
determines the start-up defaults should be set to the ‘A’ position as the remote panel takes the place of the local
switches. This will also connect the local earth reference to pin one of the multi-way connector for access by the
remote switches.
It is recommended that the 12-way connector be connected to a 15 pin ‘D’ connector (either normal or high density)
and wired pin for pin leaving 3 pins unconnected. The ‘D’ connector may be mounted directly on the rear of the
frame (in the case of the FR-722 or FR-722A) or on a blank rear plate covering an empty module space (in the case
of the FR-700 or FR-748A).
The matching 12-pin connector for the switcher is a Harwin part number M20-9821206 (top entry) or M20-
9891206 (side entry). These should be available through your local Harwin stockist. If the 12-pin version is
unavailable, a 20-pin type may be cut down to size. These are available through Farnell Components.
1B 2B 3B 4B 5B
1
A
2
A
3
A
4
A
5
A