IOP – General-Purpose I/O Polarity
Read/write command that toggles the polarity of general-purpose inputs and outputs.
Applies to: CMD-4CR, CMD-4EX-SA
ASCII IOP
Syntax:
Read:
IOP
Write:
IOP=[pol]
|
Where: [pol] is a 2-bit value to set polarity of the configurable I/O. Bit 0 is set to 0 for negative input logic (active low), 1 for positive input logic (active high) Bit 1 is set to 0 for negative output logic (active low), 1 for positive output logic (active high) |
Reply:
Command is accepted and executed
Read:
Returns the value set (0-3, 00b-11b) see chart.
|
Bit |
Description |
Setting |
|
|
0 |
Logic of input setting |
0 - Negative logic Active Low |
1 - Positive logic Active High |
|
1 |
Logic of output setting |
0 - Negative logic Active Low |
1 - Positive logic Active High |
IOP command
Write:
OK
Command cannot be processed
An error message is returned. See Error Codes
Example:
Read:
IOP * Returns value for general purpose I/O polarity setting
Write:
IOP=1 * Set input polarity to 1 positive logic, active high.
IOP=3 * Set input and output polarity to 1 positive logic, active high.
Notes:
- To write the value to the device’s flash memory, use the STORE command.
See also:
AI, DI, DIP, DO, DOBOOT, DOP, IO, IOBOOT, IOCFG