Rockwell Automation 1734-485ASC POINT I/O ASCII User Manual - Manual (Page 47)

Publication 1734-UM009B-EN-P - July 2003
Configuring Your ASCII Module 2-21
RX Parity Error (Bit 2)
This bit is set if a parity error is detected on the received data.
Handshake Error (Bit 6)
This error will occur only in Master-Slave Handshake Mode. It
indicates that the master has requested a new data record from the
ASCII module, but the ASCII module has not indicated new data is
available to be sent.
New Data (Bit 7)
This bit is used only when the Master-Slave Handshake option is
active. When the ASCII module receives a new data string into its
serial port, it sets this flag in its DeviceNet response message. The bit
will remain set until the master changes the RX ID Byte in it’s
produced data.
Transmitting Serial Data to
the ASCII Device In order to transmit data to your serial device, the data must first be
sent to the ASCII module and then the ASCII module must send the
data to the serial device.
The ASCII module transmits a number of characters from the
DeviceNet master to your serial device via:
· I/O messages
· explicit message
The received character string is transmitted to your serial device when:
· the specific number of bytes defined (Transmit Character Buffer
Length) is received, or
· the defined End-of-String Terminator character is detected and
active.
When either of these events occur, the ASCII module stores the
DeviceNet string data into its internal buffer and then transmits it out
its serial port.