Rockwell Automation 1769-ASCII Compact Module - Manual (Page 18)

18 Compact 1769-ASCII Module
Publication 1769-IN068B-EN-P - May 2005
• NR = Non-delimited record. An input record is received and sent to
the Compact bus interface that was not triggered by a delimiter
character. This occurs when either the buffer is filled to its maximum
receive size or a Message Timeout has occurred.
• RF = Data in the receive FIFO. The FIFO is not empty. The input
FIFO has not sent all of its data to the Compact bus interface.
• TF = Data in transmit FIFO. The FIFO is not empty. The output
FIFO has not sent all of its data to the ASCII device.
• PA = Parity error. A parity error has occurred with the received data
string. This usually indicates a mismatch in the serial port set-up of the
ASCII device and the Compact module. It could also indicate that
noise has occurred on the line and degraded the signal. This bit is set
when the receive FIFO contains a message in which a parity error
occurred in one of the incoming bytes. This bit is reset when the
receive FIFO is emptied or when a new message is received with no
parity error.
• RO = Receive buffer overflow. Some input data has been lost.
• TG = Transmit greater than Max Error. Transmit length in the output
file is greater than the maximum transmit character length in the
configuration file.
• TO = Transmit buffer overflow. Some output data has been lost.
• CNI = Channel number of the input data. This bit is set by the ASCII
module to tell the user program from which port the data was
received.
• CNO = Channel number of the output data most recently received.
This bit is set by the ASCII module to tell the user program that it has
received the data to transmit out the specified port.