CT-BOX User’s Manual
46
ALARM Command – limit set:
(ALARM:
parameter#1:parameter#2
\r)
Parameter#1
Parameter #2
Command description
Type of
command
Return value
ULIM
Current in Amps
Set the upper limit current
threshold
Set
ACK
ULIM
?
Read the upper limit current
threshold
Read
Upper threshold limit in
Amps
LLIM
Current in Amps
Set the lower limit current
threshold
Set
ACK
LLIM
?
Read the lower limit current
threshold
Read
Lower threshold limit in
Amps
Table 22:
ALARM limit command
The alarm checking is performing only when the acquisition is enabled
(ACQ:ON setting). When the acquired current is outside the configured range, the alarm
condition is set. In this condition the D-SUB “Alarm” line is driven high and the
magnetic relay is switched, so the Normally Open contact (Relay NO) becomes Closed
(see section “
I/O Connector
”).
The Alarm condition is also reported on the Status Register. The “
Alarm Status
”
bit indicates the alarm condition (
‘0’
– no alarm;
‘1’
– alarm condition). The
“Alarm
Direction”
indicates the alarm direction condition (
‘0’
– detected a current under the
LLIM;
‘1’
– detected a current over the ULIM).
External Alarm line
Status Register
Alarm bits
00
0
1
“Alarm condition” bit:
‘0’ - no alarm
‘1’ - alarm condition
“Alarm direction” bit:
‘0’ - under-current
‘1’ - over-current
Upper alarm
threshold
Lower alarm
threshold
