CS I/O tab

CS I/O Configuration

This setting controls which process will be associated with the CS I/O port. The following values are defined:

TCP Serial Server

The device will listen for an incoming TCP connection from a remote client. The port number of the listening connection is specified in the CS I/O Service Port setting. Data received on the TCP connection will be forwarded to the CS I/O port, and data received on the CS I/O port will be forwarded to this TCP connection.

PakBus

This port uses the PakBus protocol.

Modbus/TCP gateway

The device will listen for incoming MODBUS/TCP connections from a remote client. The port number of the listening connection is specified in the CS I/O Service Port setting. The device will convert incoming MODBUS/TCP frames to MODBUS/RTU and forward them to the CS I/O port. The device will wait for a response from the MODBUS/RTU device and forward the response back to the remote MODBUS/TCP client over the established TCP connection.

Disabled

This port will not be used.

CS I/O Service Port

This setting is used when the CS I/O Configuration is set to Serial Server or MODBUS/TCP gateway. To communicate with a TCP/IP server, the client application must open a socket to that server. The socket of a specific server is uniquely identified by an IP address of the host where the server is running and a port number associated with the server application on that host. This entry is where the port number of the serial server is set. Typically, it is not necessary to change this entry from its default (range 1 to 65535).

SDC Address

Communications with the data logger via the CS I/O port is done using SDC (Synchronous Device Communications). The data logger will address the devices with which it wishes to communicate using an SDC address. The CS I/O port can be configured to respond to SDC address 7, 8, 10, or 11.

CS I/O TCP Timeout

This setting, in units of seconds, will determine how fast the CS I/O serial server will time out if no activity is detected. Set to 0 for no time-out (not recommended) (range 0 to 999).

CS I/O PakBus Beacon Interval

This setting, in units of seconds, governs the rate at which the NL200/201 will broadcast PakBus messages on the CS I/O port in order to discover any new PakBus neighboring nodes. It will also govern the default verification interval if the value of the CS I/O Verify Interval setting is set to 0.

CS I/O PakBus Verify Interval

This setting specifies the interval, in units of seconds, that will be reported as the link verification interval in the PakBus hello-transaction messages. It will indirectly govern the rate at which the NL200/201 will attempt to start a hello transaction with a neighbor if no other communications has taken place within the interval.

CS I/O Modbus Timeout

This setting determines how long, in milliseconds, the MODBUS/TCP to MODBUS/RTU gateway will wait for an answer from the MODBUS server (formerly called slave) device(s) attached to the CS I/O port. If no answer is received within the timeout period, the MODBUS/TCP server will reply to the MODBUS/TCP client with error code 0x0B (Target Device Failed to Respond).