Operating instructions

Status Reporting

Channel Summary

The Channel Summary registers can summarize the channel status conditions of up to six channels. The channel/bit

assignments in the Channel Summary registers are as follows:

Channel Bit Value

Channel 1 1 2

Channel 2 2 4

Channel 3 3 8

Channel 4 4 16

Channel 5 5 32

Channel 6 6 64

When an enabled bit in the Channel Status Event register is set, it causes the corresponding channel bit in the Channel

Summary Event register to be set. Reading the Channel Summary Event register resets it to zero.

The Channel Summary Enable register can be programmed to specify which channel summary event bits from the existing

channels are logically-ORed to become Bit 2 (CSUM bit) in the Status Byte register. For single electronic loads, only

Channel exists.

Table 5-1. Channel Status Bit Description

Mnemonic Bit

Value Meaning

VF 0 1 Voltage Fault. Either an overvoltage or a reverse voltage condition has

occurred on a channel. When either of these conditions occur, Bit 0 is set

and remains set until INP:PROT:CLE is programmed. Note that this bit

reflects the active state of the Flt pin on the back of the unit.

OC 1 2 Overcurrent. An overcurrent condition has occurred on a channel. This

condition sets Bit 1 if the current exceeds 102% of the rated current, or if

the current exceeds the user-programmed current protection level. If the

overcurrent condition is removed, Bit 1 is cleared.

However, if the user-programmed overcurrent condition persists beyond

the user-programmed current protection delay time, Bit 13 is also set and

the channel is turned off. In this case, Bits 1 and 13 remain set until the

overcurrent condition is removed and INP:PROT:CLE is programmed.

OP 3 8 Overpower An overpower condition has occurred on a channel. This

condition sets Bit 3 when the internal overpower protection circuit is

limiting the input power. This occurs if the unit exceeds the rated power

of a channel.

However, if an overpower condition occurs and persists for more than 3

seconds. Bit 13 (PS bit) is also set and the channel is turned off. In this

case, Bits 3 and 13 remain set until the overpower condition is removed

and INP:PROT:CLE is programmed.