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March 10th
1997

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CHAPTER 19

Cable Specifications



Parallel Cable Specifications

This section explains the pin-out connections for the parallel cable. This cable is required if you wish to connect a machine to the network using the parallel port.

Parallel port network cables must have the following pins connected:


Pin Name     Pin     Parallel     Pin  Pin Name     
                      Cable                         

Data Bit 0    2                   15   Error        

Data Bit 1    3                   13   Select       

Data Bit 2    4                   12   Out of       
                                       Paper        

Data Bit 3    5                   10   Acknowledge  

Data Bit 4    6                   11   Busy         

Busy          11                   6   Data Bit 4   

Acknowledge   10                   5   Data Bit 3   

Out of        12                   4   Data Bit 2   
Paper                                               

Select        13                   3   Data Bit 1   

Error         15                   2   Data Bit 0   

   Ground     18     One wire     18      Ground

   Ground     19      may be      19      Ground

   Ground     20     used to      20      Ground

   Ground     21     connect      21      Ground

   Ground     22    all eight     22      Ground

   Ground     23      ground      23      Ground

   Ground     24     signals      24      Ground

   Ground     25                  25      Ground

NOTES Only 11 wires are used (including ground wire).
Both cable ends are 25-way D-type connectors, and must be of male gender.

The length of the cable may be as long as 10 metres.

Pins 1, 7, 8, 9, 14, 16 and 17 are not connected.

Pins 18 through 25 are connected to each other at each end internally. In addition, the ground wire is connected to the actual 25-way D-Type connector.

Serial Cable Specifications

This section explains the pin-out connections for the serial cables. These cables are required if you wish to connect machines using the serial ports.

There are three types of serial cable as follows:


  25-Pin             PC-to-PC             25-Pin

Pin Name     Pin   Serial Cable   Pin  Pin Name
                                                    

Receive       2                    3   Transmit

Transmit      3                    2   Receive

Ground        7                    7   Ground

  25-Pin             PC-to-AT             9-Pin     

Pin Name     Pin   Serial Cable   Pin  Pin Name     
                                                    

Transmit      2                    2   Receive      

Receive       3                    3   Transmit     

Ground        7                    5   Ground       

   9-Pin             AT-to-AT             9-Pin     

Pin Name     Pin   Serial Cable   Pin  Pin Name     
                                                    

Transmit      2                    3   Receive      

Receive       3                    2   Transmit     

Ground        5                    5   Ground       

NOTES Only 3 wires are used (including ground wire).
Cable ends are 25-way and 9-way D-type connectors,and must be of female gender.

The length of the cable may be as long as 30 metres.

Pins Transmit and Receive are always crossed.

Standard null modem design.


[Chapter 20] [Chapter 18]
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