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DB37F Connectors

Analog I/O Modules

DB37 connection to mezzanines

Each pair of I/O modules (A & B) is linked to four (4) female DB37 connectors (I/Os) on the back of the chassis:

  • The first two connectors (left to right) represent channels from Group B, which are linked to the conditioned channels from the rear I/O module.

  • The last two connectors (left to right) represent channels from Group A, which are linked to the conditioned channels from the front I/O module.

  • If the front I/O module is an analog module (DAC or ADC), the 16 channels are on connector A and connector B does not carry any signals.

  • If the back I/O module is an analog module (DAC or ADC), the 16 channels are on connector C and connector D does not carry any signals.

Digital I/O Modules

DB37 connection to mezzanines

  • If the front I/O module is a digital module (Din or Dout), the first 16 channels (00 to 15) are on the first connector, and the next 16 channels (16 to 31) are on the second connector.
  • If the back I/O module is a digital module (Din or Dout), the first 16 channels (00 to 15) are on the first connector, and the next 16 channels (16 to 31) are on the second connector.

All signals are represented by a positive-negative pair that are always available on the connector pins, for example: for channel 08 : (08+, -08)

Positive/Negative Signals Connection

  • For a single-ended output, the negative conductor is connected to Ground
  • For a differential output, the positive and negative signals are on the connector
  • For a differential input, the connection must be between the positive/negative pair
  • If the input is single-ended, user’s ground must be connected to the negative side of the pair

RJ45 Connectors

Each RJ45 monitoring panel on the front of the OP5705XG simulator connects to front and back I/O modules.
The following images illustrate how the I/O modules are linked to the connectors.

OP5705XG Rear (DB37)

RJ45 connection to mezzanines

RJ45 Channel Assignments

Each I/O module is assigned two columns of RJ45 connectors.
Each column represents a series of channels, divided into 4 channels per jack, as shown in the figure below.

RJ45 channel assignments


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