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    Configuring Serial Interfaces

    The RX55 provides a 9-pin serial port that allows it to easily interface with other devices using a standard straight-through cable.

    If you have a DCE device, you need to use a null modem (cross-over) cable.

    The same serial port can be configured as a dual 4-wire+ 2-wire serial port, and connect to devices with a Y cable (Sierra Wireless part number 6001238). The Dual Port Mode setting is available in AirLink OS under Hardware Interfaces > Serial > Configuration > Dual-Mode Enable.

    See the RX55 Hardware User Guide for the pinout information for single and dual port modes.

    Initializing Table Of Contents...

    SETTING DESCRIPTION
    DUAL-MODE ENABLE Configures the serial port as a dual 4-wire + 2-wire serial port. When dual port mode is enabled, you can configure the Port and PAD settings for each port independently. Off(default), On

    Configuring Port Settings

    To configure the serial port, use the following settings:

    For Port 1

    SETTING DESCRIPTION RANGE/OPTIONS
    MODE When Packet Assembler/Disassembler(PAD) mode is enabled, additional settings appear for that port. See Configuring PAD Settings Disabled(default), PAD
    BAUD RATE Configures port speed 115200 (default), 4800, 9600, 19200, 38400, 57600, 115200, 230400
    DATA BITS Number of bits used to represent each character of data 8 (default), 7
    PARITY Additional bit used for error checking None (default), Odd, Even
    STOP BITS One or more bits that indicate the end of a data frame 1 (default), 2
    FLOW CONTROL

    Flow control enables the receiving device to control the data flow. This is useful if the receiving device has a heavier traffic load or less processing power than the sending computer.

    NOTE: Most receiving serial devices use only the TX, RX, and Gnd pins in an RS-232 serial cable. However, if the receiving serial device also uses the RTS and CTS pins on the serial cable to control data flow between the two devices, set this field to Hardware. If the software uses flow control, then configure this field to XON/XOFF.
    XON and XOFF characters in data stream are escaped with the @ character (0x40). @ in data is sent as @@.

    • None—No flow control is being used (default)

    • Hardware—RTS/CTS hardware flow control is being used

    • XON/XOFF—Transparent software flow control.
    ASSERT DSR Assert DSR always, or when the device is in a data mode (UDP, TCP, etc.), or when the device is in network coverage. Note: This setting is not available in dual port mode. Always (default), In Data Mode, WAN Ready (In Coverage)
    ASSERT DCD Assert DCD always, or when the device is in a data mode (UDP, TCP, etc.), or when the device is in network coverage. Note: This setting is not available in dual port mode. Always (default), In Data Mode, WAN Ready (In Coverage)
    DTR ASSERTED/DE-ASSERTED STATUS Assert DTR when the device is in a data mode (UDP, TCP, etc.), or when the device is in network coverage, otherwise ignore. Ignore (default), In Data Mode

    Configuring PAD Settings

    When MODE is set to PAD, the following settings will appear and can be configured:

    PAD MODE using UDP

    SETTING DESCRIPTION RANGE/OPTIONS
    PAD MODE Sets the protocol used to send messages TCP (default), UDP
    LISTEN FOR CONNECTIONS (AUTO-ANSWER) When set to the DISABLED state, the router functions as a client. When in the ENABLED state, the router can function as a client or accept incoming connections and act as a server Off (default), On (makes LISTENING PORT available)
    LISTENING PORT The port on the AirLink router used for incoming TCP communication 1–65535, 5001 (default)
    DESTINATION PORT The destination port that TCP/UDP communication is sent to 1 to 65535, 6001 (default)
    DESTINATION ADDRESS IP address TCP/UDP communication is sent to n/a
    MTU The serial maximum transmit unit (PAD payload) 256 to 4096, 1304 (default)
    DATA FORWARDING TIMEOUT

    The Data Forwarding Timeout feature causes AirLink OS to send a new PAD packet if the timeout has expired since it last received data on the serial port.
    0 or 1 indicate there is no timeout. Default value is 100ms

    		 0–255, 100 ms (default)
    IDLE TIMEOUT Specifies a time interval during which, in the absence of any inbound or outbound traffic through a TCP connection, the connection will be terminated 0 to 255, 5 min (default)
    CONNECT TIMEOUT Specifies the number of seconds to wait for a TCP connection to be established when dialing out 0 to 255, 30 s (default)
    START [ONLY] WHEN WAN AVAILABLE When On, only start connection attempt when a WAN link is available. The connection will be closed when WAN is unavailable Off (default), On

    The additional following settings will appear if PAD MODE is set to TCP.

    SETTING DESCRIPTION RANGE/OPTIONS
    TCP RECONNECT ON DISCONNECT When On, the router attempts to maintain the TCP connection by automatically reconnecting after the connection to the server is closed for any reason. A back-off mechanism will try to reconnect with an increased waiting period between each retry (maximum wait time is 30 minutes). This is disabled when LISTEN FOR CONNECTIONS (AUTO-ANSWER) is ON Off (default), On
    TCP KEEPALIVE When On, the device sends keepalive probe packages when the connection is idle in order to maintain the connection. You can configure a Keepalive Time, Keepalive Interval and the number of Keepalive Probes Off (default), On
    KEEPALIVE IDLE SECONDS Sets the interval between the last data packet sent and the first keepalive probe 0 to 65535, 30 (default)
    KEEPALIVE PROBE INTERVAL Sets the interval (in seconds) between keepalive probes 0 to 65535, 10 s (default)
    KEEPALIVE PROBE COUNT Sets the number of unacknowledged probes to send before considering the TCP connection dead 0 to 65535, 3 (default)

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