Remote Inhibit / Remote Shutdown; Table 3-15: Remote Inhibit Mode Settings - California Instruments MX30-1 User Manual

User Manual – Rev AJ

3.12 Remote Inhibit / Remote Shutdown

It may be necessary to provide a remote shutdown of the AC or DC output of the MX. The
external remote inhibit input may be used for this purpose (RI). This input is also referred to as
remote shutdown.
The default mode of operation for the RI input is a contact closure between pins 5 and 6 (return
of the rear panel screw-terminal strip. This will open the output relay of the MX.
If the firmware revision of the MX is 0.28 or higher, it is possible to reverse the polarity o
input. This requires the use of the following bus command:
OUTPut:RI[:LEVel] HIGH
OUTPut:RI[:LEVel] LOW
The remote control interface must be used to change this setting. Once set, the polarity setting
remains in effect. On units with firmware rev 0.27 or lower, this input level mode selection is not
available.
MX Series I
When set to HIGH, an active low TTL level or a contact closure is required to enable the o
relay of the MX. Opening the contact or removing the low input signal will cause the output rela
to open.
MX Series II
The way the MX responds to a remote inhibit event can be programmed over the remote control
interface using the OUT
on changing modes. The mode set is retained at power off and recalled at power up so stays in
effect till changed again ov
T he following modes a
MODE
LATCHING
LIVE
OFF
NOTE: When using the Remote I
connection to the MX master unit when turning on the MX master unit. During
initialization, the RI connection must be OPEN or initializatio
the message WARING FOR AUXILIARY displayed on the LC
70
/* Sets RI polarity to active high.
/* Sets RI polarity to active low (Factory default)
P:RI:MODE command. See 7003-961 prog
er the bus.
re sup ported.
OPERATION
A TTL low at the RI input latches the output in the
protec tion shutdown state. This state can only be
cleared by sending a OUTPut:PROTection:CLEar
command over the bus.
The output state follows the state of the RI input. A TTL
low or contact closure at the RI input turns the output
off; a TTL high or open contact turns the output on.
This mode is equivalent to using the Output On/Off
button on the front panel.
Default mode. Units are shipped in this mode.
The instrument ignores the RI input.

Table 3-15: Remote Inhibit Mode Settings

nhibit input, it will be necessary to disconnect any RI
California Instruments
f the RI
utput
ramming manual for details
n will be halted with
D screen.
MX Series
)
y