Operation
31
Serial interface
The Model 765 comes with an RS 232 interface.
The interface is user-definable for direct control of a
printer with serial input or for direct connection to a
computer. The pH meter is completely computer
controllable and all values and parameters can be
read out.
Interface parameters
The RS 232 interface is user-definable for all com-
mon baud rates and data protocols.
Settings are made on the Parameter level.
• Baud rate: 600 / 1200 / 2400 / 4800 / 9600 Bd
• Data format:
• Protocol: No protocol
XON/XOFF bidirectional handshake
If not ready to accept data,
the meter transmits XOFF < 13 > H,
if ready to accept data, XON < 11 > H
Pin assignment
The pH meter has a 9-pin D SUB connector (con-
nector with pin contacts). The metallic connector
shell is connected to signal ground via a capacitor
and provides EMI shielding.
Data word length
Parity
Stop bit
7 bits
even
1
7 bits
odd
1
8 bits
none
1
Contact
Signal
Input/Output
2
(RD) Received data
Input
3
(TX) Transmitted data
Output
5
(SGND) Signal ground
4,6,8
Jumpered
Содержание 765
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