MKS Device Dependent Messages
Chapter Seven: IEEE-488 Communications Option
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Diagnostic Messages
The Diagnostic messages help to troubleshoot a problem with the 670 instrument. The messages
in this category enable you to read the value of the input bits and define the value of the output
bits on the I/O connector.
Diagnostic Messages
Function
Message
Set the Output Bits on the
I/O Connector
Command
:cont:out value
Refer to Table 25, page 99, for a list of the I/O connector
output pins.
Read the Value of the Input
Bits on the I/O Connector
Query
:cont:in?
where value is an ASCII number from 0 to 65535(16 bits)
Refer to Table 26, page 101, for a list of the I/O connector
input pins.
Table 35: IEEE-488 Diagnostic Messages
Example 1: How To Test the Output Signals on the I/O Connector
This diagnostic test allows you to set the values of the output signals on the I/O connector. Use a
voltmeter to read the value of the signals at the connector to detect any problem. This command
controls the 8 outputs on the I/O connector. Table 25, page 99, lists the output pins, the output
bit number assignments, and the bit values. To determine the connector value, add the bit values
of the bits you wish to pull low. A value of 255 will set all the outputs low. Enter the connector
value as the <data> field in the command string.
1. Calculate the connector value by adding the value of the bits you wish to pull low, in this
case bits 3 (Channel 1 selected) and 5 (x1 range):
4 + 16 = 20
Value of bit 3
Value of bit 5
Connector value
2. Send the following command:
:cont:out 20
ENTER
3. Use a voltmeter to measure the output signals on pins 29 and 23 of the I/O connector.
Each pin should be close to 0.00V.
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