Manual ETH-IDIO-16 B1
13
Low Level Interface Information
The following information is provided for users who cannot or choose to not use AIOETHW.dll. This is
necessary in non-windows operating systems. For your reference consider reading the source code for
AIOETHW.dll provided with your software install. More information is available in the HTML API reference
installed in your software directory
Packet Structure
A packet is a byte-lengthed string; the first byte is the length(in bytes) of the body. A packet's body consists of
a 4-byte (ASCII)
“type” followed zero or more bytes of payload.
A few defined packet types are as follows:
Type Direction Meaning
Payload
ChIP
M>S
Change IP
address.
4-byte big-endian IP address. For example, C0 A8 01 AE for 192.168.1.174. Device
should reply with
W_OK
or
_Err
.
RADI
M>S
Read "all"
DIO data.
No payload defined at this time. Device should reply with
R_OK
or
_Err
.
WADO
M>S
Write "all"
DIO data.
1-byte length of DIO data, then DIO data. For example, 06 01 02 04 08 10 20 to set
bit 0 on the first byte of DIO, bit 1 on the next byte of DIO, etc. up to bit 5 on the last
byte of DIO. Device should reply with
W_OK
or
_Err
.
W_OK
S>M
Write
succeeded.
1-byte length of written data. For example, 01 to indicate success of a 1-byte write.
R_OK
S>M
Read
succeeded.
1-byte length of read data, then read data. For example, 03 42 49 4F to read 42h,
49h, and 4Fh.
_Err
S>M
Transaction
failed.
4-byte little-endian Windows error code. For example, 42 00 00 00 for
ERROR_BAD_DEV_TYPE, indicating read from a write-only device or vice versa.
Table 5-1: Packet Type Definitions
for a complete and detailed DLL API function and packet-level command and
control reference.
