96 lines
2.7 KiB
HTML
96 lines
2.7 KiB
HTML
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<TITLE> PLIP Install HOWTO: Building your own cable</TITLE>
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<H2><A NAME="s8">8. Building your own cable</A> </H2>
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<P>
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<P>
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<P>Extract from /usr/src/linux/Documentation/networking/PLIP.txt,
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written by Donald Becker (becker@super.org):
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<P>
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<PRE>
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Parallel Transfer Mode 0 Cable
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==============================
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The cable for the first transfer mode is a standard
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printer "null" cable which transfers data four bits at a time using
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data bit outputs of the first port (machine T) connected to the
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status bit inputs of the second port (machine R). There are five
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status inputs, and they are used as four data inputs and a clock (data
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strobe) input, arranged so that the data input bits appear as contiguous
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bits with standard status register implementation.
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A cable that implements this protocol is available commercially as a
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"Null Printer" or "Turbo Laplink" cable. It can be constructed with
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two DB-25 male connectors symmetrically connected as follows:
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STROBE output 1*
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D0->ERROR 2 - 15 15 - 2
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D1->SLCT 3 - 13 13 - 3
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D2->PAPOUT 4 - 12 12 - 4
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D3->ACK 5 - 10 10 - 5
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D4->BUSY 6 - 11 11 - 6
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D5,D6,D7 are 7*, 8*, 9*
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AUTOFD output 14*
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INIT output 16*
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SLCTIN 17 - 17
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extra grounds are 18*,19*,20*,21*,22*,23*,24*
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GROUND 25 - 25
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* Do not connect these pins on either end
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If the cable you are using has a metallic shield it should be
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connected to the metallic DB-25 shell at one end only.
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</PRE>
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<P>I checked my cable twice. On both sides, pins are connected like
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this:
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<P>
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<PRE>
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1 - 1 Yes
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2 - 15
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3 - 13
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4 - 12
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5 - 10
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6 - 11
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7 not connected
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8 not connected
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9 not connected
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10 - 5
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11 - 6
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12 - 4
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13 - 3
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14 - 14 Yes
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15 - 2
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16 - 16 Yes
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17 - 17
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18 not connected
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19 not connected
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20 not connected
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21 not connected
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22 not connected
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23 not connected
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25 - 25 not connected to metallic shield
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</PRE>
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<P>Unlike the cable described in the kernel document, my cable has pins
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1, 14, 16 connected. It doesn't matter, apparently, since plip
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works fine for me.
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<P>
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