Metrohm 750 Autosampler - Manual (Page 56)

5.2 Interfaces
750 Autosampler
53
5.2.2 RS232 interface
The RS232 interface 11 11 is used for complete control of the 750 Auto-
sampler by an external computer. The interface is wired as DCE device
(DCE: Data Communication Equipment) and has the following technical
data:
Baud rate: 300 … 38400 (selectable, see section 3.8)
Data bits: 5 … 8 (selectable, see section 3.8)
Parity: even, odd, none (selectable, see section 3.8)
Stop bit: 1, 2 (selectable, see section 3.8)
A 1:1 RS cable with a male 9-pole plug is required as a connection ca-
ble (e.g. 6.2134.000 Metrohm cable 9-pol/9-pol).
Remote operation of the Autosampler is carried out with the ASCII
commands described in chap. 3.8. An example of the use of these
commands in a RS232 control program, which is programmed in Mi-
crosoft Basic, is given below.
100 ' *** OPEN COM1 FOR RS-232 ***
110 OPEN "COM1:4800,N,8,1,RS,CS,DS,CD" AS #1
120 ' *** SEND CARRIAGE RETURN TO COM1 **
130 PRINT #1,CHR$(13)
140 ' *** PUT VALVE INTO THE LOAD POSITION ***
150 PRINT #1,"@VLV LD" + CHR$(13)
160 ' *** GO TO NEEDLE HOME POSITION ***
170 PRINT #1,"@GTV 0" + CHR$(13)
180 ' *** GO TO VIAL POSITION 25 ***
190 PRINT #1,"@GTV 25" + CHR$(13)
200 ' *** LOWER THE NEEDLE TO POSITION 1 ***
210 PRINT #1, "@LDL 1" + CHR$(13)
220 '*** PUT VALVE IN INJECT POSITION ***
230 PRINT #1, "@VLV INJ" + CHR$(13)
240 ' *** CLOSE RS-232 PORT ***
250 CLOSE #1
260 END