MAIMAN ELECTRONICS SF6040 Manuale d'uso - Pagina 18

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Maiman Electronics

Text-plain mode

All commands in text-plain mode should be in ASCII.

WARNING! If you enable the checksum it will change format of commands. After <CR> symbol

you will be write 2 bytes of checksum and last byte will be <LF> (0Ah – "new line" symbol). Checksum is

computed for all bytes of command before checksum bytes (including<CR> symbol).

All answers of the device will also contain a checksum, including K-type and E-type answers.

Checksum is computed by CRC-CCITT-8 algorithm. This is the main difference between the format

of commands for the extended protocol and standard protocol.

The format of commands for enabled checksum

Number of byte

2-5

7-10

12-13

Possible problems

1. The device waiting for symbol <LF>. If <LF> symbol does not received and buffer is overflowed,

then all symbols after overload will be processed as a new command. The device returns an

error. In this case, it is recommended to send the <LF> symbol. The device will generate an

error and clear the buffer for the next command.

2. All symbols after the <LF> symbol will be processed as a new command.

Value

P,J,K,E

Number of parameter

'space' symbol (20h)

New value of the parameter

'return carriage' symbol<CR>

(0Dh)

Checksum

'new line' symbol<LF> (0Ah)

Comment

Type of command

Hex-number of value

(does not use for J and E-type commands)

Hex-value of parameter (does not use for J and

E-type commands)

End of value

CRC checksum of the first 11 bytes (for J and E-

type commands checksum is computed for the

first 6 bytes), including <CR> symbol.

End of command

SF6040