BENTLY 3500/26 Dynamic pressure monitor

The NIOC command allows you to send command packets directly to the network (initially only Ethernet) interface driver. The packet to be sent must already reside in memory and must follow the packet protocol of the interface. This command facilitates in the transmission and reception of raw packets (command identifiers 2 and 3, see below), as well as some control (command identifiers 0, 1, 4, and 5, see below). The command packet specifies the network interface (CLUN/DLUN), command type (identifier), the starting memory address (data transfers), and the number of bytes to transfer (data transfers). The packet structure is defined in the "C" header file listed in Appendix I. The command types are listed in this header file as well.

The command types (identifiers) are as follows: 

The initialization (type 0) of the device/channel/node must always be performed first. If you have booted or initiated some other network I/O command, the initialization would already have been done.example, the current receive data is no longer needed, or to provide a known buffer state prior to initiating data transfers. The reset device/channel/node (type 5) would be used if another operating system (node driver) needs to be control of the device/channel/node. Basically, put the device/channel/ node to a known state. Whenever an error occurs, the initiated I/O control process is terminated and the appropriate error code is displayed. The error codes are listed in Appendix H.

The above example illustrates the transmission

 (type 2) of a packet (ARP Request). The transfer byte count specifies how many bytes are to be transmitted. If the transfer byte count is below the minimum transmit byte count for the specified interface, the driver rounds to the minimum and places it into your packet. However, the specified network interface driver does not round down to the maximum if the transfer byte count exceeds the maximum. You must ensure packet integrity (e.g., source and destination addresses) for the specified network interface; the driver does not insert any data

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