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Appendix A: Host Interface

Scale Status Byte Format

Scale Status Byte

Format

When communicating in host mode using the standard Toledo protocol, the PS

may send status bytes containing information such as motion and over/under-

capacity conditions. The message <STX>?<status byte><CR> indicates

transmission of a status byte. The status byte sent is an ASCII character that

must be converted to binary form for decoding the bits. The ASCII character

table with binary conversion (given in the previous section) can be used to

convert status bytes. The bits of the status byte in the standard Toledo protocol

are defined as follows:

Status Byte

Bit No. Bit Description

6 Always 1

5 Always 1

4 1 = Center of zero

0 = Not at center of zero

3 1 = Outside zero capture range

0 = Within range

2 1 = Under zero

0 = Within weighing range

1 1 = Over capacity

0 = Within weighing range

0 1 = Scale in motion

0 = Stable weight data

Scale Confidence

Byte Format

When communicating in host mode using the standard Toledo protocol, the

host may ask the PS to store and send confidence bytes containing information

about RAM, ROM, and EEPROM testing. The message <STX>?<confidence

byte><CR> indicates transmission of a confidence byte. The confidence byte

sent is an ASCII character that must be converted to binary form for decoding

the bits. The ASCII character table with binary conversion (given in the

previous section) can be used to convert status bytes. The bits of the

confidence byte in the standard Toledo protocol are defined as follows:

(08/04) Appendix A -

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Mettler Toledo PS6L Spezifikationen Seite 63