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PK220034

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 System Development

Changing Modes

The operating mode of the PK2200 is determined during power-up

initialization. If a valid program is found in EPROM, then it is executed.

Otherwise, the operating mode is determined by the jumper settings on JP4

or by keypress combinations. Following are the possible modes of opera-

tion:.

• Run a program stored in RAM or flash EPROM.

• Prepare for Dynamic C programming using the RS-232 port.

The mode can be changed by either of the following two methods:

1. Set jumper JP4 to the desired position. Remove power from the

PK2200. Apply power to the PK2200.

2. With power off, hold down the appropriate keys on the keypad and

apply power. Refer to Figure 4-1 for the appropriate keypress combina-

tions.

You will hear a series of beeps indicating that the mode has been set.

The PK2240 has a sample program loaded at the factory that

will run automatically when the PK2240 is powered. You can

set the PK2240 to program mode using the procedures above.

All other models are preconfigured for program mode.

Setting the Mode

Figures 4-1, 4-2, and 4-3 illustrate keypad and jumper settings for run and

program modes for different PK2200 configurations. The keypress

combination for the 3x4 keypad will work only with the PK2240 model.

The keypress combination for the 2x6 keypad will work with any model

with a 2x6 keypad. If programming at normal 19,200 bps, then press the

“menu setup” and “up pgm” keys. If programming at 28,800 bps, then

press the “menu setup” and the “down pgm” keys. You may instead set the

programming baud rate with jumpers on JP4.

At startup, a PK2200 can also be put into run mode by placing a jumper

across pin 6 and pin 7 of JP4.

Figure 4-1. 2x6 Keypad Mode Settings

Program Mode Run Mode

pgm

down

pgm

help

init

menumenu

setup

item

field

run

F1 delF4F3F2 add

pgm