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Electronic Theatre Controls Inc

USAP Setup and Connect

Wire Specification

ETC specifies the following wire for proper USAP operation:

  • RS-232 / EIA-232, 3-wire
  • Belden 9729 or equivalent

RS-232 standards recommend a maximum length of 50’ with this wire type.

Connector Specification

One way to connect to a RS-232 transmitting device, such as a computer, is via a DB9 connector. Connection to the architectural processor in any revision and to any board is made via a 3- pin Mascon connector (ETC part # J6132 and its cover ETC part # J6129). 

ETC manufactures a USAP cable (ETC part # 7080B7007) that is Mascon female to DB9 female. This cable is also included in the UPSAC kit (ETC part # 7080S1001).

Note: If you are building your own cable please note the following:

Mascon Connectors require a special crimping tool. Specific pinouts are detailed in the next section. The ER4 signal distribution board revision number installed will determine the pinout of the connector.

Connection

Serial connection to the Unison system is made via the serial connector on the architectural option board (ARCH) in a Unison DR dimming rack, and the serial connector on the signal distribution board in an ER4 rack.

Pinout for Connection to the ER4 Rack

Pinout in the ER4 rack varies based on the revision of the signal distribution board in the ER4 rack.This number and letter combination is screened onto the board. While the revision numbers are hard to read when an architectural processor is installed, an easy way to determine the significant revision is that all signal distribution boards REV E and higher have two serial connectors and all REV D and lower have only one.

Pinout for Signal Distribution Board, Rev A - D in an ER4 Rack

Notice for connection to a signal distribution board, rev D or lower, TX and Ground are swapped. You will be required to plug the connector into the serial connection upside down.

Screen Shot 2018-12-11 at 10.39.21 AM.png

If you are building your own serial cable the 9-pin female DB9 connector to Mascon connector pinout is as follows:

DB9
(female)
Mascon
(female)
Type
Pin 2 Pin 1 Unison TX
Pin 3 Pin 2 Unison RX
Pin 5 Pin 3 Ground

Pinout for Signal Distribution Board, Rev E and Higher in an ER4 Rack

Serial connection is made to the connector closest to the architectural processor.

Screen Shot 2018-12-11 at 10.51.58 AM.png

If you are building your own serial cable, the 9-pin female DB9 to Mascon connector pinout is as follows:

DB9
(female)
Mascon
(female)
Type
Pin 5 Pin 1 Ground
Pin 3 Pin 2 Unison RX
Pin 2 Pin 3 Unison TX

Pinout for Connection to a DR Dimming Rack

Pinout for the architectural option board in a DR Rack is similar to that found in the signal distribution board (rev D or lower) in the ER4 rack. If you are attaching the Serial Access Protocol cable to the ARCH board in a DR Rack, note that TX and Ground are swapped. You will be required to plug the connector into the serial connection upside down.

Pinout for Arch Option board in a DR Dimming Rack

Screen Shot 2018-12-11 at 11.51.13 AM.png

If you are building your own serial cable, the 9-pin female DB9 to Mascon connector pinout is as follows:

DB9
(female)
Mascon
(female)
Type
Pin 2 Pin 1 Unison TX
Pin 3 Pin 2 Unison RX
Pin 5 Pin 3 Ground
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