9.5. RS communication protocol for the on-board INTEGRATOR (optional)
9.5.1 Communication between the PC and the INTEGRATOR of the LAMBDA instrument
From the PC to the INTEGRATOR:
#ss mm z qs c
From the INTEGRATOR to the PC:
| <mm ss = qs c | confirmation of the reception of a command |
| <mm ss dddd qs c | sending of the requested data |
where,
| # | is the first sign of a command sent by the MASTER (PC) |
| < | is the first sign of a message sent by the SLAVE (INTEGRATOR) |
| ss | is the address of the subordinate station (address of the instrument with integrated INTEGRATOR) |
| mm | is the address of the commanding station (PC) |
| z | is a command (see below): small letters indicate a command, capital letters request data transfer from the subordinate station |
| = | confirmation of reception |
| aa | new address of the subordinate station (ss) (two numbers and possibly other ASCII characters A B C D E F) |
| dddd | transferred data (values are two bytes in hexadecimal form. Single bytes are transformed into two ASCII characters 0,..,9,A,B,C,D,E,F) |
| qs | is the control sum (obtained by the addition modulo 256 of binary values of all preceding characters including the leading sign) in HEX format (2 ASCII signs of the type 0…9ABCDEF) |
| c | is the end sign cr (carriage return) |
9.5.2 Commands for the INTEGRATOR
| n | reset (sets the INTEGRATOR to zero) |
| i | start of integration |
| e | stop of integration |
| l | sends the integrated value |
| N | sends the integrated value and sets the integrator to zero |
| L | sends the integrated value ccw rotation (to the left) (not for DOSER) |
| R | sends the integrated value of cw rotation (to the right) |
9.5.3 Examples
| Address of the PC: | 01 |
| Address of the instrument with on-board INTEGRATOR: | 02 |
| The PC sends: | #0201I2Fcr |
The control sum (checksum) qs is made in the following way (only the last byte (2 ASCII characters of the type 0…9ABCDEF) is taken):
| # | 0 | 2 | 0 | 1 | I | 2F (last byte) | cr |
| 23h | +30h | +32h | +30h | +31h | +49h | =12Fh | 0Dh |
| The PC sends: | #0201i4Fcr |
| i.e. in hexadecimal form: | 23h 30h 32h 30h 31h 69h 34h 46h 0Dh |
This means: For a subordinate station (SLAVE) with address 02 from commanding station (MASTER) with address 01
Start of integration
The control sum is 14Fh (last byte: 4F); end of message cr (carriage return)
| The INTEGRATOR answers: | <0102=3Ccr |
| The PC sends: | #0201N34cr |
| The INTEGRATOR answers: and resets to zero |
<0102N03C225cr (integrated value is 03C2h) |
| The PC sends: | #0201e4Bcr |
| The integration will be stopped and the command will be confirmed. | |
| The INTEGRATOR answers: | <0102=3Ccr |