10.1 RS communication protocol for LAMBDA OMNICOLL fraction collector-sampler
10.2 How to set the OMNICOLL Fraction Collector-Sampler address?
10.3 RS-connection scheme

 

10.1 RS communication protocol for LAMBDA OMNICOLL fraction collector-sampler

10.1.1 Format of data sent by the PC to the fraction collector and back

Data sent by the PC:#ss mm a xxxx qs c
Data sent back by the fraction collector:<mm ss a xxxx qs c
where,
#is the first sign of a command sent by PC
<is the first sign of a message sent by fraction collector
ssis the address of the fraction collector (slave)
mmis the address of the PC (master)
Ais the command (see section 10.1.2)
xis the data value (4 ASCII numbers from 0 to 9; sent from the highest order digit to the lowest order digit)
Qsis the control sum in HEX format (2 ASCII characters of the type 0…9ABCDEF)
Cis the end sign cr (carriage return) The collector will fulfil the task and block any manual command on the front panel.

10.1.2 Commands

# ss mm r qs cstart (run)
# ss mm e qs cactivates remote control of the collector (front panel deactivated)
# ss mm g qs cactivates local mode (front panel activated)
# ss mm s qs cstop
# ss mm f qs cstep forward
# ss mm b qs cstep back
# ss mm w qs cstep in actual moving direction (depending on LINE or MEAN setting) [corresponds to pressing the STEP button]
# ss mm l qs cstep to next line
# ss mm h qs c“high” mode
# ss mm u qs c“normal” mode
# ss mm m qs c“MEAN” collection mode (meander or zigzag collection mode)
# ss mm v qs c“LINE” collection mode (collects fractions always from left to right)
# ss mm i qs c“ROW” collection mode, the collector moves only from row to row
# ss mm d qs cunit setting – 0.1 minute step time setting (XXX.X)
# ss mm j qs cunit setting – minute step time setting (XXXX)
# ss mm o qs copen valve
# ss mm c qs cclose valve
# ss mm a qs cdivision coefficient setting “1”
# ss mm k qs cdivision coefficient setting “1/60”
# ss mm p xxxx qs cnumber of pulses from pump or drop counter
# ss mm t xxx.x qs ccollection time (in 0.1 minute steps)
# ss mm t xxxx qs ccollection time (in minute steps)
# ss mm q xxx.x qs cpause time between two fractions (in 0.1 minute steps) (fraction collector automatically enters “high” mode)
# ss mm q xxxx qs cpause time between two fractions (in minute steps) (fraction collector automatically enters “high” mode)
# ss mm n xxxx qs cnumber of fractions (fraction collector automatically enters “high” mode)
# ss mm G x qs cto request the fraction collector to send data to the PC

where x is a number from 0-3:

0: collection time setting (TIME)

1: pulse setting (COUNT)

2: pause time setting (PAUSE)

3: number of fractions setting (NUMBER)

The answer of the OMNICOLL fraction collector-sampler is the following:

< mm ss B xxx.x qs ctime xxx.x in 0.1 minute steps (collector is in stand-by mode)
< mm ss B xxxx qs ctime xxxx in minute steps resp. number of pulses or fractions (collector is in stand-by mode)
< mm ss R xxx.x qs ctime xxx.x in 0.1 minute steps (collector is in operation)
< mm ss R xxxx qs ctime xxxx in minute steps resp. number of pulses or fractions (collector is in operation)

10.1.3 Checksum control

The following examples show , how the checksum is calculated

mm = 01 [PC address (master) is set to 01]

ss = 02 [Device address (slave) is set to 02]

The PC sends:#0201g4Dcr

The control addition (checksum) is made in the following way (only the last byte (2 ASCII characters of the type 0…9ABCDEF) is taken):

#0201g4D (last byte)cr
23h+30h+32h+30h+31h+67h=14Dh0Dh
The PC sends:#0201t102320cr

The control addition (checksum) is made in the following way (only the last byte (2 ASCII characters of the type 0…9ABCDEF) is taken):

#0201t102320 (last byte)cr
23h+30h+32h+30h+31h+74h+31h30h+32h+33h= 220h0dh

10.1.4 Format of the data transmission

Speed:2400 Bd (Baud)
8 data bits, odd parity, 1 stop bit

 

10.2 How to set the OMNICOLL Fraction Collector-Sampler address?

When the LAMBDA OMNICOLL fraction collector and sampler has been equipped with the optional RS-232 interface, it can be controlled digitally, e.g. from a PC.

Disconnect the fraction collector-sampler from the mains. While keeping the direction button STEP pressed connect the fraction collector to the mains again. The message “A” and two numbers will appear on the display. This number from 00 to 99 is the current address of the fraction collector. To change the address press the buttons Λ Λ Λ Λ under the display until the desired number is obtained. Confirm your choice by pressing the button SET.

 

10.3 RS-connection scheme

The 5-pole DIN connector “REMOTE” of the communication module (Art. No. 6911 or 6929) is used for the remote control and RS connection.

When the optional RS-232 interface is available the pins are used as follows:

No.ColourDescription
1blueInput remote control +3-12 V
2whiteRS-232 TTTL (TXD)
3blackGround (GND)
4
5yellowRS-232 RTTL (RXD)