User guide
BASIC NETWORK
■ Serial Protocol: Defines the protocol used on serial communication.
■ Listen Port: Defines the TCP or UDP port that Masters connect to.
■ Serial Response Timeout: If the serial side does not respond within a specific time, data is dropped and not
transmitted.
■ Serial Timeout Retries: If set to 0, the gateway doesn't store TCP packets in the buffer. If is set to greater
then 0, the gateway stores TCP packets in the buffer and retries for the specified time when the Modbus
device on the serial side doesn't respond.
■ 0Bh Exception: When the Modbus slave device doesn't respond before timeout, the 0Bh exception code is
transmitted to the master that initiated the message.
■ Serial Message Buffering: When enabled, the gateway will buffer TCP up to 32 requests. If disabled, the
gateway will respond with a 06h if it has a message out on the port with no response.
■ Tx Delay: The minimum amount of time after receiving a message before the next message can be sent out.
■ TCP Connection Idle Timeout: Idle timeout, in seconds, for the Modbus /TCP connection. If no response
within the time limit the connection is closed.
■ Maximum TCP Connection: A maximum of four simultaneous Modbus /TCP connections is allowed.
■ Trusted IP Access: Defines the IP that is allowed to connect to the gateway.
■ Modbus Priority: Defines the priorities from specific IPs, Modbus IDs, or Function Codes.
MultiConnect
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rCell 500 Series Router User Guide 31