User manual

Model 6220/6221 User’s Manual Delta, Pulse Delta, and Differential Conductance 5-17
Return to Section 5 topics
8. When finished, press EXIT to disarm Delta.
9. On the Model 622x, press RECALL to access the Delta readings stored in
the buffer.
Operation – PC control
The system configuration for PC control of the Model 622x is shown in
Figure 5-2B.
1. Connections are shown in the following illustrations. All power must be
removed from all components in the system before making connections:
• Figure 5-4, page 5-7 – System connections
• Figure 5-5, page 5-8 – Test connections
2. Configure communications for the Models 2182/2182A and 622x as
explained in “Configuring communications,” page 5-9.
3. On the Model 2182/2182A, select the desired measurement range and
integration rate. These Model 2182/2182A settings can be made from the
front panel or remote programming can be used. Rate must be set to an
integer value (1, 2, 3, ... up to 50 or 60). If some other rate is selected, it will
automatically be changed to 1PLC by Model 622x during the arming pro-
cess.
For front panel operation, use the RANGE keys to select the measurement
range. To set the integration rate, use the RATE key.
Commands from the PC to control the Model 2182/2182A are addressed to
the Model 622x. Each command is then routed through the Model 622x out
the serial port (RS-232) to the Model 2182/2182A. The following command
word is used for this communication process:
SYSTem:COMMunicate:SERial:SEND <data>
Where: <data> is a valid Model 2182/2182A command.
The following query command is used to return the response to a query
command sent over the serial port:
SYSTem:COMMunicate:SERial:ENTer?
When communicating over the serial port, there are no errors reported if a
Model 2182/2182A is not properly connected to the Model 622x.