Data Bits And Parity; Flow Control (Signal Handshaking) - Keithley 2601 Reference Manual

Section 11: Communications Interfaces
The factory-selected baud rate is 9600.
When you choose a baud rate, make sure the programming computer that you are connecting to
the SourceMeter can support the baud rate you selected. Both the SourceMeter and the other
device must be configured for the same 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. No parity is only valid when using 8 data bits.

Flow control (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 (see
and Table
receives the clear to send (CTS) signal from the computer.
Figure 11-4
RS-232 interface connector
Table 11-3
RS-232 connector pinout
Pin number
1
2
3
4
5
6
7
8
9
To enable or disable flow control, use the RS-232 configuration menu. Select HARDWARE to
enable flow control, or NONE to disable it.
11-10
11-3). When the Series 2600 is ready to send (RTS) data, it will transmit when it
Description
Not used
TXD, transmit data
RXD, receive data
Not used
GND, signal ground
Not used
RTS, ready to send
CTS, clear to send
Not used
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Series 2600 System SourceMeter® Instruments Reference Manual
Figure 11-4
2600S-901-01 Rev. C / January 2008