15 | ESP302-GPIB-ADPT
A1387A0-EDH0429En1010 11/21
USER's MANUAL
2.6 Indicators
The ESP302-GPIB-ADPT has six diagnostic LEDs that display the following conditions:
PWR
Indicates power on
RDY
Indicates unit has passed self-test
TLK
Indicates unit has recognized its talk address
LSTN
Indicates unit has recognized its listen address
SRQ
On when SRQ is asserted (Service request is not supported by ESP302)
ERR
Indicates an error has occurred
When the ESP302-GPIB-ADPT is turned on, it performs an internal self-test which takes about five
seconds. During self-test the ESP302-GPIB-ADPT sequentially turns each LED on and off. It then
shows its current GPIB device address by blinking the appropriate front panel LEDs for about 2
seconds. The LED bit weights are:
RDY
TLK
LSTN
SRQ
ERR
16
8
4
2
1
Figure 2: LEDs
Then, if self-test was successful, PWR and RDY LEDs should be on.
Otherwise, any errors found during self-test are indicated by a repeated blinking of the error code
pattern. Refer to paragraph 6.1 for a description of the errors and their possible causes.
If the 5-volt reading is below 4.7 volts, the ESP302-GPIB-ADPT will repeat its power turn-on sequence
until the voltage level reaches 4.8 volts or higher.
