Owner`s manual

37
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COMPUTER-TO-MODEL 24-TO-PERIPHERAL
PERIPHERAL-TO-MODEL 24-TO-COMPUTER
When a computer transmits data to a peripheral device through a
computer port on the Model 24, the data is received and stored in the
spooling buffer (standard 512K; optional up to 4.5 MB) which in turn
retransmits it to a peripheral device through a printer port. During
transmission, when there are only 15 bytes available in the buffer, the
Model 24 will make the computer port's DTR (Data Terminal Ready)
line low (negative voltage), signaling the transmitting computer that it
cannot accept more data. When the buffer of the Model 24 can receive
more data, the Model 24 will make the transmitting computer port's
DTR line high (positive voltage).
When the Model 24 retransmits the data to the peripheral device
through a printer port, and the peripheral device cannot receive any
more data, the Model 24 will expect to see a low on the CTS
(Clear-to-Send) line. When the peripheral device can receive more
data, the Model 24 will expect to see a high on the CTS line.
In the reverse direction (peripheral-to-Model 24-to computer),
handshaking is the same, but the spooling buffer is not utilized.