If you need more control over the bytes transferred over the bus than the high level OUTPUT and ENTER statements allow, you can use the SEND statement as described in the following paragraphs. The OUTPUT and ENTER statements may also be used for byte level transfers under certain circumstances.
Before you can communicate with a device on the IEEE-488 bus, the talker device and the listener device(s) need to be addressed. The high level OUTPUT and ENTER transfer statements generate the necessary device addressing for you. When using the SEND statement, you must generate all the proper bus addressing commands yourself. This requires a more detailed knowledge about IEEE-488 bus operations than is presented here. Please consult any one of the many available books about the IEEE-488 bus or your IEEE-488 bus device manuals.
