Ascii Bidirectional Protocol; Setpoint Programming; Setting Setpoint Values Currently In Use; Setpoint Storage In Eeprom Memory - LAUMAS TLU Installation And User Manual

The instrument replies to the requests sent from a PC/PLC.
It is possible to set a waiting time for the instrument before it transmits a response (see
parameter in the SERIAL COMMUNICATION SETTINGS section).
Following communication modes availables (see SERIAL COMMUNICATION SETTINGS section in
instrument manual):
Captions:
$: Beginning of a request string (36 ASCII);
& or &&: Beginning of a response string (38 ASCII);
aa: 2 characters of instrument address (48  57 ASCII);
!: 1 character to indicate the correct reception (33 ASCII);
?: 1 character to indicate a reception error (63 ASCII);
#: 1 character to indicate an error in the command execution (23 ASCII);
ckck: 2 ASCII characters of Check-Sum (for furthers information, see section CHECK-SUM
CALCULATION);
CR: 1 character for string end (13 ASCII);
\: 1 character of separation (92 ASCII).
1.

SETPOINT PROGRAMMING

1.1.

SETTING SETPOINT VALUES CURRENTLY IN USE

The PC transmits the following ASCII string: $aaxxxxxxyckckCR
where: xxxxxx = 6 characters to indicate the setpoint value (48  57 ASCII);
y = A (set the value in the setpoint 1).
y = B (set the value in the setpoint 2).
y = C (set the value in the setpoint 3).
y = D (set the value in the setpoint 4).
Possible instrument responses:
- correct reception: &&aa!\ckckCR
- incorrect reception: &&aa?\ckckCR
1.2.

SETPOINT STORAGE IN EEPROM MEMORY

The setpoint are stored in the RAM volatile memory and lost upon instrument power off. It is
necessary to send a special command to save them permanently in the EEPROM memory. Please
note that the writing number allowed in the EEPROM memory is limited (about 100000).
The PC transmits: $aaMEMckckCR
Possible instrument responses:
- correct reception: &&aa!\ckckCR

ASCII BIDIRECTIONAL PROTOCOL

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