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Chapter
5
Terminating Resistor Configurations
Pin
Source of Data
27
28
29
30
31
Host
32
Printer
33
34
35
36
Host
Terminating Resistor Configurations
The factory equips the printer with several resistors that are used for parallel
interface configurations and are suitable for most applications. These 470
ohm pull–up and 1K ohm pull–down terminating resistors are located within
the electronics of the machine and should be accessed only by an IBM
Customer Service Representative.
If the values of these terminating resistors are not compatible with the
particular interface driver requirements of your host computer, you may need
to have a different resistor combination installed on your printer. You must call
your printer service representative to have this situation addressed.
130
Table 4. Printer 1284 Connector Signals
Compatible
Signal Ground (PError, Select, nAck)
Signal Ground (nAutoFd, nSelectIn, nInit)
NFault
nSelectIn
Type of Mode
Nibble
Signal Ground (Data 8)
Signal Ground (Busy, nFault)
nInit
nDataAvail
Not Defined
Not Defined
Not Defined
1284 Active
Byte
nDataAvail
1284 Active
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