Instruction Manual

CHR xx Change the instrument range according with the parameter

value (xx):

• xx=06 EC range

• xx=07 TDS range

• xx=08 NaCl range

The instrument will answer for these commands with:

<STX> <answer

<ETX>

where: <STX> is 02 ASCII code character (start of text)

<ETX> is 03 ASCII code character (end of text)

<answer>:

<ACK> is 06 ASCII code character (recognized command)

<NAK> is 21 ASCII code character (unrecognized command)

<CAN> is 24 ASCII code character (corrupted command)

COMMANDS REQUIRING AN ANSWER

The instrument will answer for these commands with:

where the checksum is the bytes sum of the answer string sent as 2 ASCII

characters.

All the answer messages are with ASCII characters.

RAS Causes the instrument to send a complete set of readings in

according with the current range:

• EC and temperature reading on EC range.

• TDS, EC and temperature reading on TDS range.

• NaCl, EC and temperature reading on NaCl range.

The answer string contains:

• Meter mode (2 chars):

• 06 - EC range

• 07 - TDS range

• 08 - NaCl range

• Meter status (2 chars of status byte): represents a 8

bit hexadecimal encoding.

• 0x40 - TDS unit (0-ppm, 0-g/L)

• 0x20 - EC unit (0-µS, 1-mS)

• 0x10 - temperature probe is connected

• 0x01 - new GLP data available

• 0x02 - new SETUP parameter

• 0x08 - AUTOHOLD is stable