Section 2: Installation Model 2601B-PULSE System SourceMeter® Instrument User's Manual
2-32 2601B-PULSE-900-01 Rev. A August 2021
Sending and receiving data
The RS-232 interface transfers data using 7 or 8 data bits; 1 stop bit; and no, even, or odd parity.
Make sure the device you connect to the 2601B-PULSE also uses the same settings.
RS-232 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 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 2601B-PULSE and the programming terminal communicate.
Select one of the following available rates:
The factory-selected baud rate is 9600.
Both the 2601B-PULSE and the programming terminal must be configured for the same baud rate.
Make sure the device connected to the 2601B-PULSE 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 to determine if they are ready to receive data.
The RS-232 interface provides two control lines (request to send and clear to send) for this purpose.
The instrument asserts the RTS signal when it is admissible for the computer to transmit to the
instrument. It sends information to the computer when the CTS signal is asserted by the computer.
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