2-30
2
1
2.9
DDIGITAL I/O CABLE DESIGN
The following instructions will guide the user through the design of an
interface cable between the Digital I/O connector and an external device.
The end product is a three sheet 'A' drawing that can be used to fabricate the
interface cable and a table with the 4863 configuration settings.
1
For custom cables, make a copy of Tables 2-7 and 2-8 as your
worksheets. For the 4863 Open End Cable shown in Figure 2-10,
copy Tables 2-9 and 2-8. Use these sheets when directed to record
signals, pin numbers etc.
The 4863 Open End Cable is a five foot long cable terminated into a 62-
pin connector. Table 2-9 lists the cable wire colors.
Figure 2-10 4863 Open End Cable Connector
2.
Make a rough determination of the number of output and input
signals from the external device. The number should not exceed 48.
3.
If any of the signal lines are to be monitored, they should be
assigned to the first two bytes (CH1-CH15). CH16 is not monitored.
The monitored lines may also be read by a byte or string command.
4.
If input data is being transferred by a string command, assign the
external devices to the 4863 data lines starting with first free byte.
For BCD/HEX coding, start with the lowest numbered data lines.
Assign the signals to the proper bit weights so that the numbers
come out correctly. Typical assignments for a small panel meter
are:
