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Two front panel module status LED indicators show the operating state of the DSO. Circuits on the DSO determine the module status and light the LED accordingly. OPERATING PROCEDURES in Section 4 explains the indications, and TROUBLESHOOTING in Section 5 explains corrective actions to take.This section explains the procedures required to place the IMDSO14 Digital Output module into operation. It includes instructions on setting the address selection switch, setup and physical installation and wiring and cable connections. DO NOT PROCEED with operation until you read, understand and complete the steps in the order in which they appear.NOTE: Always use the Elsag Bailey field static kit (part number 1948385
1), consisting of two wrist straps, ground cord assembly, alligator clip, and static dissipating work surface when working with static sensitive devices. The kit is designed to connect the technician and the static dissipating work surface to the same ground point to prevent damage to the static sensitive devices by electrostatic discharge.

Status Data 

Status data consists of three separate 8-bit bytes read by the control module. The first and second bytes contain readback data that reflects the state of group A and group B outputs. Each bit of this data corresponds to the digital output state (ON or OFF). The third byte is the module identification and module status. I/O module identification is in the four most significant bits (MSB). It identifies the I/O module to the control module. It also verifies the I/O expander bus communication integrity and the control module configuration. I/O module status is the least significant bit (LSB). During initialization, the control module writes data to the output register and default register, and forces this bit to a logic 1. A reset or time-out (bus fault error) resets it to a logic 0. Default data is normally written only during control module start-up. The control module reads the module status bit to test for a change in the state of the module. It uses this bit as a signal to rewrite data to the module to ensure that proper default values are in the default register.

Default Data

 Default data is two 8-bit bytes sent to the default registers. It is set by the control module configuration (FC 128). The function of this data is the same as the output data but is used only when a time-out occurs. LOGIC POWER Logic power (+5 VDC) drives the DSO circuits. It connects through the top 12-pin card edge connector (P1) shown in Figure 2-1. BUS FAULT TIMER The bus fault timer is a one-shot timer that is reset by the I/O expander bus clock; the control module generates the bus clock. If the clock stops (indicating a control module error or failure), the bus fault timer times out in 10 milliseconds. This causes the digital outputs to change to their default values. A red front panel status LED indicates a bus fault (time-out).

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