Phoenix Contact 2702772, User Manual

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Configuration and startup
3785_en_B PHOENIX CONTACT
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Stop bits : Select 1 or 2 stop bits.
Flow control : Available options for RS-232 flow control are hardware RTS/CTS ,
software Xon/Xoff , half duplex, and none .
RS-485 terminating resistor: The terminating resistor is used only in RS-485
networks. If the GW EIP/ASCII... is the last device in the RS-485 network, enable the
terminating resistor.
DTR mode: Select on all the time or off all the time when a connection is established
on this port.
Rx timeout between packets: This is the maximum spacing between received bytes
allowed before the received Modbus serial message is expected to be complete. The
default value is 200 ms .
Discard packets with errors: If enabled, all packets with parity, framing, or overrun
errors are dropped.
The GW EIP/ASCII... modules can be configured to detect serial packet delimiters used for
the identification of a raw data packet.
4.7.1.2 Raw/ASCII serial packet delimiters
“Detect Delimiters from Serial Device”:
Figure 4-10 “Raw/ASCII Serial Packet Delimiiters” dialog box
Start transmission (STX) : When enabled, GW EIP/ASCII... detects an STX (start of
transmission) byte sequence which is configured as one byte or two bytes when it
receives a serial packet. If none is selected, the GW EIP/ASCII... accepts the first byte
received after the last End Transmission (ETX) byte(s) as the start of the next data packet.
If one byte is selected, the GW EIP/ASCII... starts to collect data when the STX byte is
detected. If the first byte is not the STX byte, it discards the byte. The GW EIP/ASCII...
continues to discard the bytes until it finds an STX byte. If two bytes is selected, the
GW EIP/ASCII... starts to collect data when both of the STX bytes are detected. If the STX
bytes cannot be found, it discards the bytes. The GW EIP/ASCII... continues to discard the
bytes until it finds the two STX bytes.
– Byte 1: Specifies the character that represents the first STX byte. The GW EIP/ASCII...
looks for this character in the first STX byte, if the length is one byte or two bytes.
Specify a value between 0 and FF in hexadecimal format.
– Byte 2: Specifies the character that represents the second STX byte. The
GW EIP/ASCII... looks for this character in the second STX byte, only if the length is two
bytes. Specify a value between 0 and FF in decimal format.
End transmission (ETX): When enabled, the GW EIP/ASCII... detects an ETX (end of
transmission) byte sequence that is configured as one byte or two bytes marking the end
of the serial packet. The length indicates the number of ETX bytes; if none is selected, this
function is disabled and the GW EIP/ASCII... uses the Rx Timeout Between Packets to
indicate the end of data packet. If one byte is selected, the serial data is checked for one
ETX byte to identify the end of a serial packet. If two bytes is selected, the serial data is
checked for two ETX bytes to identify the end of a serial packet.