Oki 182 Handbook page 137

- - - - - - - - - A P P E N D I X C INTERFACE CABLE
Pin Signal Symbol Direction Description
1 Frame Ground FG
-
Connected to the printer
frame
2 Transmit Data TD From Not used. Always set to
printer low.
3 Receive Data
RD To printer Serial data received by the
printer
4 Request to Send RTS
From
printer
Always set to low.
7 Signal Ground
SG Ground Ground
11 Supervisory SSD
-
Indicates the printer is
Send Data ready to receive data.
20 Data Terminal DTR
From
Indicates the printer is not
Ready printer ready to receive data.
In addition to the cable, this optional serial interface has a piggyback
circuit board that must be installed in the printer. (Installation instruc ­
tions are included with the serial board.) On the board is a set of
eight function switches, which you may have to reset depending on
the computer you connect to the printer.
Before installing the board, make sure the switches are set properly.
The function of each switch is as follows:
Switch 1: Regulates the polarity of the busy signal. Originally
set OFF, so the printer sends a negative (-) low
signal when the printer is busy. Set this switch to
OFF if your computer requires a positive
(+)
high
signal from the printer when it is busy.
Switches 2 to 4: Select the transmission speed (baud rate) between
the computer and printer. The factory setting is
1200 baud. Use the chart below to choose another
speed:
119