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PST-1000 series Technical Manual 5 - 28

POWER ON/OFF CONTROL

EXTERNAL POWER SWITCH

This switch is originally a software controlled power “ON/OFF” switch. It can

be programmed into a power “ON” only switch through software command. The so

called software controlled switch means that when the switch is pressed during system

working, the system will be turned off after all data in the SSD buffer are secured. The

SSD buffer mentioned here is an infrastructure of the system and is different from the

RAMDRIVE mentioned in the last section. To program this switch, the programmer

needs to issue the following mentioned commands in the application program to

COM1 under the protocol: 9600 bps, parity none, 8 data bits, 1 stop bit.

• Change to power on only switch -- the command string is <1B> <19> <01> in

hexadecimal format.

• Change to power on/off switch -- the command string is <1B> <19> <00> in

hexadecimal format (default status)

SOFTWARE SWITCH OFF

An even safer method to turn the system off is the software off switch. Usually

the position LP of the 6 position key switch (or any other key or key combination or

any other position of the 6 position key switch as may be preferred) is selected for this

purpose. The programmer has to program the answer back code of position LP of the

programmable keyboard to some command to close the application program (such as

“Alt+F4”). At the end of the closing operation, the application program should issue

the following mentioned software switch off command string to COM1 under the

protocol: 9600 bps, parity none, 8 data bits, 1 stop bit. Or, as an alternative, the

programmer may program the answer back code of position LP to contain:

The closing command of the application program;

A certain period of hold on time to allow a safe closing;

The command to call for a program which will send the

software switch off command string to COM1 as described.

The hexadecimal command string for software switch off function is :

<1B> <06> <16> <19> <0D>.

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