1. Pin Out
GND – Return for the DC power supply. GND (& Vcc) must be
ripple and noise free for best operation.
Vcc – Operates on 2.5V – 5.5V
TX – TX output delivers asynchronous serial data in RS232 format, except voltages are
0-Vcc. The output is (up to twelve) ASCII characters representing the pH or status
messages; all ending with a carriage return (ASCII 13).
Example:
4.60
The baud rate is: 38400, 8 bits, no parity, with one stop bit.
The voltage swing 0-VCC, not +/- 12 volts
If standard voltage level RS232 is desired, connect an RS232 converter such as a
MAX232.
RX – RS-232 receive pin
BNC – pH probe connection
*For best resu
lts use an Atlas Scientific pH probe