Parallel And Serial Ports - ENCAD CADJET 2 Service Manual

Theory of Operation
3.13

Parallel and Serial Ports

Figure Chapter 2 .5: Parallel and Serial Ports
Data from the host computer is received either through the Centronics
parallel port or the serial port. The gate array provides the control
signals for DMA transfers from the parallel port.
The serial port is designed primarily to interface to a Macintosh printer
port. It has an eight pin Mini-Din connector. The data (TXD, RXD)
signals meet RS422 electrical specifications, and the control signal
(DTRCLK) meets the RS423 electrical specifications.
signal can be configured as a 1MHz clock for high speed serial
communications with a Macintosh.
The serial port is compatible with RS232 devices when an appropriate
adapter cable is used. This cable is available from ENCAD. Please
refer to Chapter 7 of this Service Manual for the part number.
2-16
The control
CADJET 2