HP 706C User Manual download pdf (Page 42)

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COMPUTER-TO-PRINT MASTER-TO-PRINTER COMMUNICATION

When a computer transmits data to a printer through a Print Master

computer port, the data is received and stored in the buffer which in

turn retransmits it to the printer through a printer port. During

transmission, after the buffer fills to where there is only 4K of memory

remaining, Print Master will make the computer port's CTS

(Clear-to-Send) line low (negative voltage), signaling the computer

that it cannot accept any more data. However, Print Master can

accept another 4K before overflowing the buffer.

When the buffer empties to where more than 4K remains (Print

Master's buffer outputs 4K blocks of data), Print Master will make the

CTS (Clear-To-Send) line high (positive voltage), signaling the

computer that it can accept more data.

When Print Master retransmits the data to the printer and the printer

cannot receive any more data, the unit will expect to see a low on the

DTR (Data Terminal Ready) line. When the printer can receive more

data, Print Master will expect to see a high on the DTR line.

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HP 706C User Manual Page 42