11-10 Return to Section Topics 2600S-901-01 Rev. C / January 2008
Section 11: Communications Interfaces Series 2600 System SourceMeter® Instruments Reference Manual
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 Figure 11-4
and Table 11-3). When the Series 2600 is ready to send (RTS) data, it will transmit when it
receives the clear to send (CTS) signal from the computer.
Figure 11-4
RS-232 interface
9876
54321
Rear Panel Connector
RS-232
connector
Table 11-3
RS-232 connector pinout
Pin number Description
1
2
3
4
5
6
7
8
9
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
To enable or disable flow control, use the RS-232 configuration menu. Select HARDWARE to
enable flow control, or NONE to disable it.
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