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7. Interface protocol RS-232
CTH6500
Recognise MEASURED VALUE 1 + 2 automatically
GB
Enable keyboard
Read version number of firmware
Read storage (only for instruments with data logger)
The data are sent by the instrument in the following format.
Data type = String
The string length depends on whether it is a 1-channel or a 2-channel instrument.
Example: Turbo Pascal source code for interface initialisation
PROCEDURE V24open (com1, com2: Boolean);
{RS 232 initialisation}
VAR value: Byte;
BEGIN
IF com1
PORT
PORT
PORT
PORT
PORT
Value:
END;
END;
34
If data are read out from the instrument using the FC (hex) command, the
keyboard is locked. It can be enabled again using the 0 (hex) command.
THEN BEGIN
[$3FB]: =
[$3F8]: =
[$3F9]: =
[$3FB]: =
[$3FC]: =
= PORT
WIKA operating instructions, models CTH6300 and CTH6500
{of COM 1 initialisation}
128;
{Enable Baud entry}
48;
{Baud rate - LSB, 2400 Baud}
0;
{Baud rate - MSB}
7;
{8 bits, No parity, 2 Stop}
2;
{DTR = 0, RTS = 1}
[$3F8]
{Clear receiving register}
FC (hex)
0 (hex)
I (ASCII)
n (ASCII)
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