User's Manual

UMAC Turbo CPU/Communications Board Hardware Manual

Ethernet Protocol 35

VR_PMAC_GETBUFFER

This packet causes the Ethernet connection to return any available string that may be residing in the

PMAC. All characters up to an <ACK> or <LF> are returned. If a <BEL> or <STX> character is

detected, only the data up to the next <CR> is returned. The maximum amount of data returned is 1400

Bytes. It is the caller’s responsibility to determine if there is more data to follow and to call

VR_PMAC_GETBUFFER again to retrieve all of the data available.

EthCmd.RequestType = VR_UPLOAD;

EthCmd.Request = VR_PMAC_GETBUFFER;

EthCmd.wValue = 0;

EthCmd.wIndex = 0;

EthCmd.wLength = htons( (WORD)strlen(outstr));

EthCmd.bData - Not Used

Example:

int CALLBACK PmacSockGetBuffer(char *instr)

{

EthCmd.RequestType = VR_DOWNLOAD;

EthCmd.Request = VR_PMAC_GETBUFFER

EthCmd.wValue = 0;

EthCmd.wIndex = 0;

EthCmd.wLength = htons( (WORD)strlen(outstr));

send(sock,(char *)&EthCmd,ETHERNETCMDSIZE,0);

recv(sock,(char *)&instr,1400,0);

}

VR_ IPADDRESS

This packet permits either setting or retrieval of the current IP address in the UMAC Turbo

CPU/Communications Board. When setting the IP address to a new value, it is required that the UMAC

Turbo CPU/Communications Board be powered down for the new address to take effect.

EthCmd.RequestType = VR_UPLOAD to retreive the IP address

EthCmd.RequestType = VR_DOWNLOAD to set the IP address

EthCmd.Request = VR_IPADDRESS;

EthCmd.wValue = 0;

EthCmd.wIndex = 0;

EthCmd.wLength = htons(4);

EthCmd.bData = contains 4 bytes of data indicating the IP

address set on the send command.

For the Receive command, four bytes of data are returned indicating the IP address.

VR_PMAC_SENDCTRLCHAR

This packet sends a single character or control character to the UMAC Turbo CPU/Communications

Board. The packet below is sent. The data received is irrelevant; its purpose is to ensure that the sender’s

command has been received.

EthCmd.RequestType = VR_DOWNLOAD;

EthCmd.Request = VR_PMAC_SENDCTRLCHAR;

EthCmd.wValue = htons(outch); // the character to write

EthCmd.wIndex = 0;

EthCmd.bData - Not Used