Jenway 3540 - Manual (Page 77)

10.2 Analogue Output
The Model 3540 is provided with 2 x 4mm sockets, marked as Analog O/P on the rear panel.
The level is proportional to the displayed reading, depending on the measurement mode:
pH measurement and calibration modes
1mV per 0.01pH
mV measurement mode 1mV per 1mV
Conductivity 1mV per least significant digit
10.3
RS232 Serial Interface
The bi-directional RS232 interface is available on the rear panel 9 way D type connector. The
connections are as follows:
DCD 1
- Linked to DTR and DSR
RXD 2 - Input to 3540
TXD 3 - Output from 3540
DTR 4 - Linked to DCD and DSR
GND 5
DSR 6
- Linked to DCD and DTR
RTS 7 - Output from 3540
CTS 8 - Input to 3540
Suggested interconnections are detailed as follows:
3540
IBM PC XT (25 way “D”)
1 DCD DCD8
2 RXD RXD 3
3 TXD TXD 2
4 DTR DTR 20
5 GND GND 7
6 DSR RTS 4
7 RTS DSR 6
8 CTS CTS 5
9
3540
IBM PC XT (9 way “D”)
1 DCD 1 DCD
2 RXD 2 RXD
3 TXD 3 TXD
4 DTR 4 DTR
5 GND 5 GND
6 DSR 6 DSR
7 RTS 7 RTS
8 CTS 8 CTS
9
The RS232 communications parameters on the computer or printer need to be set to match
those of the 3540, as detailed below:
1200 baud 9600 baud
7 data bits 8 data bits
Odd parity OR No parity
1 stop bit 1 stop bit