9.1. RS communication protocol for LAMBDA DOSER, VIT-FIT, PRECIFLOW, MULTIFLOW, HIFLOW and MAXIFLOW pumps
9.1.1 Format of data sent by the PC to the pump and back
| Data sent by the PC: |
#ss mm a ddd qs c |
| Data sent back by the pump: |
<mm ss a ddd qs c |
| where, |
|
| # |
is the first sign of a command sent by PC |
| < |
is the first sign of a message sent by pump |
| ss |
is the address of the pump |
| mm |
is the address of the PC |
| a |
is the command for the sense of rotation: |
| r |
for clockwise (cw) rotation (to the right) |
| l |
for counter-clockwise (ccw) rotation (to the left) (not for DOSER and MASSFLOW) |
| ddd |
is the speed of rotation (3 ASCII numbers from 0 to 9; sent from the highest order digit to the lowest order digit) |
| qs |
is the control sum in HEX format (2 ASCII signs of the type 0…9ABCDEF) |
| c |
is the end sign cr (carriage return) The pump will fulfill the task and block any manual command on the pump front panel. |
9.1.2. Commands not containing data
| # ss mm g qs c |
activates the local command of the pump |
| # ss mm s qs c |
the pump is stopped |
| # ss mm G qs c |
to send pump data to the PC |
9.1.3 Checksum control
| The PC sends: |
#0201r123EEcr |
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 |
r |
1 |
2 |
3 |
EE (last byte) |
cr |
| 23 h |
+30h |
+32h |
+30h |
+31h |
+72h |
+31h |
+32h |
+33h |
=1EEh |
0Dh |
9.1.4 Format of the data transmission
| Speed: |
2400 Bd (Baud)
8 data bits, odd parity, 1 stop bit |
