Rockwell Automation 5370 CVIM Communications Manual - Manual (Page 104)

Chapter 5
Using the RS–232 Ports
5–34
For Example:
This example will read the status of all fourteen outputs. FF sets all bits in
byte 3 (outputs 1 though 8) and 3F sets bits 0 through 5 of byte 4 (outputs 9
through 14).
One byte is returned to indicate the status of the output (1 = ON and 0 =
OFF). The output bytes are transmitted in numerical order (output #1 then
output #2, etc.). The amount of data returned depends upon the number of
outputs being read.
If the BCC is not valid, the CVIM module will respond with a DLE NAK
and the command will not be executed.
If the BCC is valid, the CVIM module will respond with a DLE ACK. Then
the CVIM module will validate the command structure. If the command is
valid, the CVIM module will execute the command and return the data. If the
command structure is invalid, the CVIM module will not execute the
command or respond.
Use the read configuration command to read configuration data for the
specified object. The command has the following structure:
06 07 Flags (17 bytes)
This function can only be executed once per command. The only valid object
for this command are the configuration blocks.
The flags indicate which of the 136 configuration blocks are going to be
read. Set the bits in bytes 3 through 19 of the command to specify the
block(s). Use the following chart to determine which bits to set:
Read Output Status (cont’d)
Read Configuration
Block Command