Oki 18 Service Manual page 253

(b) Sending circuit
Note: The above signal level is for the case where 3KOhms x 15pF is being connected to the terminal.
(6) Communication protocol
a) READY/BUSY protocol
b) X-ON/X-OFF protocol
Copyright 1998, 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)