Fast Queries - TDK-Lambda Genesys User Manual

8.9.

Fast Queries

These are commands that read a response very quickly from the Power Supply. They use
unprintable character codes. They allow the Power Supply to avoid the normal command
processing delays.
The processing time for these queries is typically 2ms, so total query speed is 2ms plus the
RS-232/RS-485 transmission time.
Since these queries embed the power supply address (0 to 30), there is no need to first send
the "ADR n" addressing command.
8.9.1. Fast Test for Connection
This is an addressed query that is good for scanning to see what power supplies are "on
line". If no response is returned within 10ms, the control program has determined that no
Power Supply is connected at that address.
Query Format:
Send two bytes of unreadable characters. First:
Byte 1 = 1010 1010 = AA hex
Byte 2 = 000x xxxx
Query Response:
The power supply returns 5 characters:
Then four printable characters:
8.9.2. Fast Read Registers
This query allows fast polling of the status and error registers for many power supplies on
a RS-232/RS-485 link. It is useful for checking many supplies to verify they are all
operating as expected.
Query Format:
Send two bytes of unreadable characters. First:
And send it a second time:
Query Response:
The power supply returns 16 characters including the contents of the status and
fault registers (see Section 8.11 and Figure 8-7).
First twelve bytes contain binary data from six registers:
Then four printable characters:
(where xxxxx is the address of the supply in binary)
First a "1" = 31 hex if Multi-drop is enabled
or a "0" = 30 hex if Multi-drop is not enabled
Dollar sign "$"
Checksum (two ASCII hex characters) = "30" or "31"
Carriage-return terminator
100x xxxx (where xxxxx is the address of the supply in binary)
100x xxxx send 2 characters sequentially
STAT? SENA? SEVE? FLT? FENA? FEVE?
Dollar sign "$"
Checksum (two ASCII hex characters)
Carriage-return terminator
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