MTD2000 AT Command Guide R12
Confidential
DAVISCOMMS (S) PTE LTD
75 /105
20 Fail Safe Output Command
20.1 Fail Safe Output Default – AT$FSD
This command will set the default value of fail safe output port upon power up. It is
recommended to set the output port to LOW for power saving if the output port is not
used.
Note:
1. If the fail safe output port is used as current source, the current direction is from
device to the load when output is set to LOW (activate output). In this case, set the
output to HIGH will deactivate the output.
2. If the fail safe output port is used as current sink, the current direction is from load to
the device when output is set to HIGH (activate output). In this case, set the output
to LOW will deactivate the output.
Syntax
Command
Response
AT$FSD=<Value>
Note: Write setting.
OK
AT$FSD?
Note: Query setting.
OK
$FSD: <Value>
Parameters
Value
Fail safe output port default value, default is 0 (LOW).
0 – LOW
1 – HIGH
Example
Command
Response
AT$FSD=1
Note: Set default value of fail safe output
port to HIGH.
OK
AT$PD?
Note: Query default value of fail safe output
port.
OK
$FSD: 1
