Oki 182 Handbook page 143

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_ _ _ _ _ _ _APPENDIX C INTERFACE CABLE
Switch 13: This switch is factory set to ON so that the printer
waits until the print buffer has room for only 32
more bytes before sending a busy signal to the com­
puter. If you discover that you are losing data, set
this switch to OFF; the printer will send a busy
signal when room for only 256 more characters
remins in the print buffer.
Switch 14:
Factory set ON for a 200-ms busy time (the time it
takes the printer to empty the print buffer and be
ready to receive data), this switch can be set to OFF
if your computer requires more time to process a
response to a busy signal. This situation normally
arises when the printer is not connected directly to
the host computer.
NOTE:
Those switches not mentioned in the list above are not currently used and
should be left in their factory settings.
Super-Speed Serial Board Diagnostic Tests:
If you would like to check your serial cable to ensure it is sending
and receiving the right signals, you can run either of the following
tests. For the circuit test, however, you need to purchase (or make) a
test cable as shown below then follow the directions under "Perfor ­
ming the Circuit Test."
1. Purchase or make a test cable, using a Cannon DB-25P plug, to
jumper the following pins:
Transmit data 2 --------.,
Receive data 3 __
0 - - - - - - - - '
Request to send
4 - - - - 1
Clear to send 5 _ ..
o -----~
Carrier detect 8 .. I
Supervisory send data 11-­
Data terminal ready 20----,
Data set ready 6 __
o - - - - - - - !
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