Keithley 2601B Reference Manual page 134

Section 2: General operation
Terminator
When receiving data over the RS-232 interface the command interface terminates on line feeds. A
line feed is appended to all output messages when the RS-232 interface is being used as a command
interface.
Sending data using the serial.write() function does not append a terminator. Be sure to append
the appropriate terminator to the message before sending it.
Baud rate
The baud rate is the rate at which the Series 2600B and the programming terminal communicate.
Select one of the following available rates:
•
115200
•
57600
•
38400
•
19200
The factory-selected baud rate is 9600.
Both the Series 2600B and the other device must be configured for the same baud rate. Make sure
the device connected to the Series 2600B RS-232 port can support the selected baud rate.
Data bits and parity
The RS-232 interface can be configured to send/receive data that is 7 or 8 bits long using even, odd,
or no parity.
Flow control and signal handshaking
Signal handshaking between the controller and the instrument allows the two devices to communicate
to each other regarding being ready or not ready to receive data.
The RS-232 interface provides two control lines (RTS and CTS) for this purpose. The instrument will
assert the RTS signal when it is admissible for the PC to transmit to the instrument. It will only send
information to the PC when the clear to send (CTS) signal is asserted by the PC.
2-110
Series 2600B System SourceMeter® Instrument Reference Manual
• •
9600 600
• •
4800 300
•
2400
•
1200
2600BS-901-01 Rev. B / May 2013