Rose electronic CTP-8S manual Power Up Initial Display, Program Checksum Test

Power Up Initial Display

When powering on, the Caretaker Plus goes through a power up self-test which checks the main functions of its electronics. The leftmost LED labeled POWER should glow green and the other red LEDs should all turn on. Then the unit will cycle through four tests lighting up LEDs 1 through 4 as each test is performed. Errors are indicated by the ERROR LED lighting and the unit halting. See TABLE 6 for the full sequence of the power up LED display and TABLE 7 for error displays.

Table 6. LED Power Up Display

Legend: M = Mode LED

D = Data LED

B = Busy LED

E = Error LED

● = LED on

O = LED off

☼ = LED flashing

X = may vary, described below

M

D

B

E

1

2

3

4

5

6

7

8

EXPLANATION

1st ●

●

●

●

●

●

●

●

●

●

●

●

All LEDs on

2nd O

O

O

O

●

O

O

O

O

O

O

O

Test 1: EPROM checker

3rd O

O

O

O

O

●

O

O

O

O

O

O

Test 2: 16K RAM buffer

O

O

O

O

O

●

O

O

O

O

O

●

Test 2: 64K RAM buffer

O

O

O

O

O

●

O

O

O

O

●

●

Test 2: 256K RAM buffer

O

O

O

O

O

●

O

O

O

●

●

●

Test 2: 512K RAM buffer

O

O

O

O

O

●

O

O

●

●

●

●

Test 2: 1M RAM buffer

O

O

O

O

O

●

O

●

●

●

●

●

Test 2: 2M RAM buffer

4th O

O

O

O

O

O

●

O

O

O

O

O

Test 3: Static RAM

5th O

O

O

O

O

O

O

●

O

O

O

O

Non-volatile RAM

6th O

O

O

O

O

O

O

O

O

O

O

O

Unit ready

NOTE: The BUSY LED may be lit when the unit enters the ready state. This is dependent upon the state of the shared device.

Program Checksum Test

This test verifies that the unit's internal program is valid by performing a checksum test. If a fault exists, a program checksum error shows on the LEDs as error 1, as shown in TABLE 7. The unit will immediately halt. This error requires that the unit be serviced.

Buffer Memory Sizing and Read/Write Test

In this test, the Caretaker Plus automatically determines amount of buffer memory present and indicates the amount via the status LEDs as shown in TABLE a. The buffer memory is then tested to ensure that the memory system is operational. Any failure will cause the error 2 condition to be displayed, as shown in TABLE 7, indicating that a buffer memory data error has occurred. The unit will not continue its further tests and will halt. An error indicates that the unit requires servicing.

20CARETAKER PLUS INSTALLATION AND OPERATIONS MANUAL