Remote Operation 
 
5-70  M370430-01  Rev B 
Where: 
<delay_time> is a value in the range of 0.5-50 seconds. The unit of 
second is the default and no units should be used with this parameter. 
(Increments of 0.1 seconds are allowed.). The default value is 0.5 
seconds. 
Over Temperature Protection 
The over temperature protection (OTP) is the alarm that protects the unit 
in case of ventilation blockage, fan failure, or some other event that 
causes the unit to overheat. The OTP cannot be masked to disable it. The 
OTP alarm can have its output latch on clearing. See “Alarm Output 
Latching” on page 3-25. 
The SCPI command (s) for these instructions are: 
[:]SYSTem[<channel(s)>]:PROTection:LATCh 
The On setting shown by the front panel (“Using Over Temperature 
Protection Lock (OTP)” on page 3-32), maps to having the OTP latch 
flag set. The OFF setting maps to having the OTP latch flag cleared. The 
default is to have the flag cleared. 
Loop Protection Enable/Disable 
The Loop Protection is described in “Loop Protection” on page 3-34. 
Enabling Loop Protection (LOOP PRO on front panel) will allow the 
Loop Protection feature to trigger based on the conditions described in 
“Loop Protection”, page 3-34. This feature can be controlled by either 
front panel operation or SCPI command as shown below. The default 
value of Loop Protection is set to Disabled. 
Important: While Loop Protection is enabled (set to ON), the external 
shutdown function will be automatically set to low active. When Loop 
Protection is disabled (set to OFF), the external shutdown function will be set to 
the user’s last setting. 
Commands: 
[:]OUTPut[<channel>]:PROTection:LOOP{?|ON|OFF} 
Where 
ON enables the use of Loop protection. Returns 1. 
OFF disables the use of Loop protection. Returns 0. 
Interlock Enable/Disable 
The Interlock feature is explained in “Interlock Function” on page 3-36. 
Use the command below to enable and disable interlock. Enabling 
interlock will allow the interlock feature to trigger based on the 
conditions described in “Interlock Function” on page 3-36. This feature