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24 Testing

Table 2–5

Values to Specify Mode Bits

Bit

Position P3 Value Description

0 1 External loopback: host port.

1 2 External loopback: printer port.

2 4 External loopback: mouse port.

3 8 LANCE loopback: Ethernet port.

4 16 Test all baud rates.

5 32 Do not exercise modem control signals.

Examples

NOTE

NCP may time out while waiting for the terminal to perform self-

tests. The timeout period of NCP version Phase V is adjustable.

• To run test number 5 with mode bits 4 and 1 speciﬁed:

1. Calculate the P3 value to specify mode bits 4 and 1.

Bit position 5 4 3210

5−Bit Mode Register

Decimal Value 32 16

16 + = 18 decimal

010010

8421

2. Enter the command:

DWT>>> TEST5518

• To run all tests without mode bits:

DWT>>> TEST 0 18

• To run a single test (for example, test 16):

DWT>>> TEST 16

Questions and Answers:

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DEC VT1000 Specifications

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