SECTION 3

BASIC OPERATING INSTRUCTIONS

3-1Operating Voltage
3-2Safety Information
3-3Connection to Target Equipment

3-1 OPERATING VOLTAGE

The EM-180 Diagnostic Emulator is normally supplied for operation from 90 to 140 Volts AC at 58 to 62 Hz line. The unit is also available for operation from 180 to 280 Volts AC at 48 to 52 Hz line if specified at time of order. The EM-180 uses a regulating transformer that also has the advantage of providing good blocking of conducted noise that may be present on the power input to the unit.

3-2 SAFETY INFORMATION

The EM-180 is supplied with a 3-wire cord with a 3-terminal polarized plug for connection to the power source and protective ground. The ground terminal of the plug is connected to the power source and protective ground. The ground terminal of the plug is connected to the me3tal chassis parts of the instrument. Electric-shock protection is provided if the plug is connected to a mating outlet with a protective ground contact that is properly grounded.

The internal (logic) ground of the EM-180 is not connected to the protective ground, but floats to the same3 potential as the equipment to which the unit is connected. The user is cautioned that it is concievable that grounding conflicts could occur if the EM-180 is connected to two different items of equipment with differing ground potentials such as the target equipment and a RS-232C terminal.

3-3 CONNECTION TO TARGET EQUIPMENT

First connect the emulator probe to the Em-180 operator station. Then remove the target system microprocessor from its socket and plug in the 40-pin plug. Be sure to observe correct pin 1 orientation. (See Figure 3-3.1)

CAUTION: NOTE CORRECT PIN 1 ORIENTATION

Figure 3-3.1. Installing 40-pin plug.

(picture)

Apply power to the EM-180 and the target system after the unit is properly connected to the target circuitry. Once power is applied to the Diagnostic Emulator and the clock begins operating, it performs a Power-on-reset operation during which the following functions are performed:

1. Reset CPU.

2. Clear Trace Memory and CPU Registers.

3. Clear the program starting address to zero (the default starting address) and display the address.

4. The Diagnostic Emulator awaits further input from the operator.

After the EM-180 is connected to the target system and power is applied to both the EM-180 and the target system, perform the following checks to verify that the unit is operating correctly:

1. The Clock Fault and Reset Fault indicators are not illuminated. This means that the system clock oscillator is operating and is being received by the EM-180 and that there is not a continuous RESET signal from the target system.

2. The PAUSE indicator should be illuminated. This indicates that no target program is executing and that the EM-180 is awaiting operator commands.

3. At power on time, the ADDRESS Display should indicated 0000. If it does, the EM-180 internal control program program is operating.

If all is well, proceed to operate the Diagnostic Emulator as appropriate. See Section 4 for details of EM-180 functions.