Rice Lake Okidata 320-390-420 Turbo - Service Guide User Manual

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Page: 65

Service Guide ML320/321Turbo

Chapter C Software Diagnostics and Adjustments


2.2.2. RS-232C interface

The DTR, SSD, TD and RTS signals output by the 80C51 are converted to RS-232C signals by line driver
SN75188 (Q1) and sent to the interface.

In addition, signals DSR, CTS, CD, and RD on the RS232C interface are converted to TTL level by line
receiver SN75189 (Q2) and input to the 80C51.

Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)

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