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design.hlp
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1989-08-09
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2KB
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25 lines
CABLE DESIGN LEGEND: The diagrams should be interpreted as follows:
DEVICE-1 DEVICE-2 The cable is viewed from end to end, with the DEVICE-1
------------------ end to be connected to the port on DEVICE-1, and the
2 --------- 3 DEVICE-2 end connected to the port on DEVICE-2.
3 <-------- 2 In the example on the left, pin 20 at the DEVICE-1 end of
4 --|-----> 8 the cable should be connected straight through to pin 20
5 <-| of the DEVICE-2 end. Pin 2 at one end should be connected
20 --------- 20 to pin 3 at the other end. Pin 4 from DEVICE-1 should be
connected to pin 5 at the same end, as well as pin 8 at
the DEVICE-2 end of the cable.
SPECIAL NOTE: If a straight through cable has been designed(pins 1--1, 2--2,
3--3, 4--4, 5--5,...etc., not all pins in the design are necessary. This
design is given for completeness. A general rule is: if the lead is not
present in both DEVICE 1 & 2's ports, there is no need to include it. Yet
a flat/ribbon cable with all 25 leads should be used for ease & completeness.
MODEMS TO COMPUTERS: The straight through cable includes connecting pins 22,
Ring Indicator, at both ends. Unless a modem is being connected to a DEVICE,
these pins are probably not needed. In the case of an IBM AT to modem cable,
connect pin 9 at the AT end to pin 22 at the modem end of the cable.
SYNCHRONOUS CONNECTIONS: Ignore Pins 15, 17, & 24 of a straight through cable
unless it is being designed to connect a device and modem for synchronous
communication.
.....PRESS ANY KEY TO CONTINUE