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Getting Started 39
OUTPUT
The HP BASIC language statement that addresses the power supply to talk and reads back data from the power supply is:
ENTER
The supply's front panel ADDR annunciator is on when the supply is addressed to talk or to listen.
Reading the HP-IB Address
Before you can operate your power supply remotely, you need to know its HP-IB address. The address was displayed
during the power on sequence described in Normal Self Test Indications, page 35. To see the address, press:
ADDR
A typical address display is shown in Figure 3-6:
Figure 3-6. Typical Address Display
The displayed response is the power supply's HP-IB address. When sending a remote command, you append this address
to the computer's HP-IB interface select code (normally 7). For example, if the select code is 7 and the power supply's HP-
IB address is 5, the combination is 705.
Changing the HP-IB Address
NOTE All examples in this discussion assume an HP-IB address of 5. It is recommended that you retain this
address to simplify programming.
Every device on the HP-IB must have an address. The supply's address is factory set to decimal 5. Any address from 0
through 30 is a valid address. If you need to change the HP 662xA Supply's address press:
ADDR
You can now enter a new address. For example, press:
1 4 ENTER
You have now changed the address from 5 to 14. If you want to change the address back to 5, repeat the above procedure
but use 5 instead of 14 in the last step. Note that the address is stored in the power supply's non-volatile memory and
therefore will be retained through interruption of the ac line power.
Sending a Remote Command
To send the power supply a remote command, combine your computer's output statement with the HP-IB interface select
code, the HP-IB device address, and finally, the power supply command. For example, to set the output voltage of output
channel 1 to 2 volts, send: