IO – General-Purpose I/O Status
Read/write command that returns/sets the input/output status of general-purpose I/O ports.
Applies to: CMD-4CR, CMD-4EX-SA
ASCII/Standalone IO Read/write all I/O ports at once
IO[portNo] Read/write individual I/O ports
Syntax:
Read:
IO[portNo]
|
Where: [portNo] specifies the port number (1-32); if not specified, then the status of all general-purpose I/O ports are returned. |
Write:
IO[portNo]=[value]
|
Where: [portNo] specifies the port number (1-32), [value] specifies status of output, 0 = off, 1 = on [portNo] If not specified, then the status of all general-purpose I/O ports are set. [value] specifies a decimal value representing a 32-bit number, which identifies port and status according to the chart below. Input values are NOT changed due to this command. |
Reply:
Command is accepted and executed
Read:
Individual general-purpose I/O port (IO[portNo])
Returns the status of general-purpose I/O port [portNo], With a value of 0 or 1 (0 off, 1 on).
All general-purpose I/O ports (IO)
Returns status of all I/O based on each a 32-bit value based on the following:
|
Bit |
Description |
Status |
|
Bit |
Description |
Status |
|
0 |
General-purpose IO 1 |
0 Off 1 On |
|
16 |
General-purpose IO 17 |
0 Off 1 On |
|
1 |
General-purpose IO 2 |
0 Off 1 On |
|
17 |
General-purpose IO 18 |
0 Off 1 On |
|
2 |
General-purpose IO 3 |
0 Off 1 On |
|
18 |
General-purpose IO 19 |
0 Off 1 On |
|
3 |
General-purpose IO 4 |
0 Off 1 On |
|
19 |
General-purpose IO 20 |
0 Off 1 On |
|
4 |
General-purpose IO 5 |
0 Off 1 On |
|
20 |
General-purpose IO 21 |
0 Off 1 On |
|
5 |
General-purpose IO 6 |
0 Off 1 On |
|
21 |
General-purpose IO 22 |
0 Off 1 On |
|
6 |
General-purpose IO 7 |
0 Off 1 On |
|
22 |
General-purpose IO 23 |
0 Off 1 On |
|
7 |
General-purpose IO 8 |
0 Off 1 On |
|
23 |
General-purpose IO 24 |
0 Off 1 On |
|
8 |
General-purpose IO 9 |
0 Off 1 On |
|
24 |
General-purpose IO 25 |
0 Off 1 On |
|
9 |
General-purpose IO 10 |
0 Off 1 On |
|
25 |
General-purpose IO 26 |
0 Off 1 On |
|
10 |
General-purpose IO 11 |
0 Off 1 On |
|
26 |
General-purpose IO 27 |
0 Off 1 On |
|
11 |
General-purpose IO 12 |
0 Off 1 On |
|
27 |
General-purpose IO 28 |
0 Off 1 On |
|
12 |
General-purpose IO 13 |
0 Off 1 On |
|
28 |
General-purpose IO 29 |
0 Off 1 On |
|
13 |
General-purpose IO 14 |
0 Off 1 On |
|
39 |
General-purpose IO 30 |
0 Off 1 On |
|
14 |
General-purpose IO 15 |
0 Off 1 On |
|
30 |
General-purpose IO 31 |
0 Off 1 On |
|
15 |
General-purpose IO 16 |
0 Off 1 On |
|
31 |
General-purpose IO 32 |
0 Off 1 On |
Write:
Individual general-purpose I/O port (IO[portNo])
OK
All general-purpose I/O ports (IO)
Returns status of all I/O based on each a 32-bit value.
Command cannot be processed
An error message is returned. See Error Codes
Example:
Read:
IO * Returns value for all general-purpose I/O
Ex. Return a value of 54, or binary …. 0011 0110, IO2, IO3, IO5, and IO6 are on, all other general-purpose I/O is off.
IO8 * Returns the status of digital input 8
Write:
IO18=1 * turns on general purpose IO18 if it is configured as an output
IO=147161088 * 147161088 in binary is 0000 1000 1100 0101 1000 0000 0000 0000; if setup as outputs, general-purpose I/O 16, 17, 19, 23, 24, and 28 are turned on, all other general-purpose I/O are turned off. Any general-purpose I/O setup as inputs are not affected.
Notes:
- Reading
This command reads the status of I/O regardless of whether it is set up as an input or output.
- Writing
The IO command only changes general-purpose I/O setup as outputs. Input values are NOT changed due to this command.
See also:
AI, DI, DIP, DO, DOBOOT, DOP, IOBOOT, IOCFG, IOP