Chapter Eleven: Troubleshooting
The Diagnostics Feature
297
Code 6: Rear Panel Status
1. Press the [6] key and then the [
ENTER
] key.
The 146 unit’s processor should respond by reading the inputs for 8 bits (remote zero 1
through 4, and latches A through D) on the General I/O connector, and displaying the
sum of the hexadecimal values which are assigned to each bit when the bit is high. Refer
to Table 88 for a listing of the hexadecimal values assigned to each bit when it is high
(when low, the bits are assigned a value of 0).
The sum of the hexadecimal values is shown in the main display. For example, if
Remote Zero 1 and Latch A are low, they are assigned a value of 0. The other inputs are
assigned the hexadecimal values shown. The 146 unit totals all values. The sum is EE
(hexadecimal for 238). If all bits are high, the sum is FF (hexadecimal for 255), as
shown in Figure 89, page 296.
Hexadecimal Values Assigned to the General I/O Connector Input Bits
Bit Definition
Hexadecimal Value if Bit is High
Remote Zero 1
01
Remote Zero 2
02
Remote Zero 3
04
Remote Zero 4
08
Latch A
10
Latch B
20
Latch C
40
Latch D
80
Table 88: Hexadecimal Values Assigned to General I/O Connector Input Bits
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