86
83507013 Rev G
7.9.3 Read Power-On Time
This query allows you to read how many minutes the power supply has been running
since it was built. The accuracy, in minutes, is not guaranteed for time critical
applications.
Query Format:
Send two bytes of unreadable characters. First:
Byte 1 = 1010 0110 = A6 hex
Byte 2 = 000x xxxx (where xxxxx is the address of the supply in binary)
Query Response:
The power supply returns 12 characters:
First is the minutes as a 32 Bit integer as 8 ASCII Hex bytes
Then four printable characters:
Dollar sign “$”
Checksum (two ASCII hex character
s) = “30” or “31”
Carriage-return terminator
7.9.4 Service Request Messages
A Genesys
™ power supply can automatically send messages over the RS232/RS485
lines when there is a change in operating mode or if a fault occurs. These messages are
called Service Requests or SRQs. They are setup with the RS232/RS485 status
registers (see section 7.10 and 7.11).
Since the SRQ messages may be sent from any supply at any time, there is a chance
they can collide with other messages from other supplies. Your controller software has
to be developed enough to read messages that may come at any time, and to recover if
messages are corrupted by collisions.
If you need Service Request messaging, please contact TDK-Lambda for assistance.
We can provide several special communication commands and settings that will help
with this.
7.10 Status Control Commands
The following commands operate on the power supply status and error registers. They are
used to read operating conditions and fault conditions, they can be set to latch changes in
these conditions, and masks can be set up to send service requests messages if the
conditions change.
Refer to the next section for more instructions.
#
Command
Description
1
FLT?
Reads Fault Conditional Register. Returns 2-digit hex.
2
FENA
Set Fault Enable Register using 2-digit hex.
3
FENA?
Reads Fault Enable Register. Returns 2-digit hex.
4
FEVE?
Reads Fault Event Register. Returns 2-digit hex. Clears bits of Fault Event Register.
5
STAT?
Reads Status Conditional Register. Returns 2-digit hex.
6
SENA
Sets Status Enable Register using 2-digit hex.
7
SENA?
Reads Status Enable Register. Returns 2-digit hex.
8
SEVE?
Reads Status Event register. Returns 2-digit hex. Clears bits of Status Event register.
