Specifications

The following SYSEX error report shows that the loopback plug was found

missing during external loopback testing of serial port 1 (COM1):

applicationDEC System Exerciser Rev: 4.0 03/01/92 (400xP)

Current time = 03/12/92 15:50:06 Elapsed time = 2:41:58

Test # 4 Serial Line (COM1) 2 Subtest # 3

Passes 1828 Errors 1 Task # 3 Processor # 0 Slot: 0

FRU = slot 0 Serial Port, loopback plug

Registers at time of error:

eax = 44E924FE ebx = 44E9245F ecx = 0000FF04 edx = 000003F8

esi = 00001000 edi = 0000005F Error address = 33F

Current UART registers:

LCR = 3B MCR = 18 LSR = 60 MSR = 8A DL = 11F

Test: External loopback (xmit -> rcvr)

Interrupt wait elapsed, outstanding interrupts = 9.

Transmit string, length = 9.

CC AC 7E 78 75 0C 38 C2 29

Receive string, length = 0.

After an error, continued testing is dependent on the state of the halt ﬂag:

Halt ﬂag on = suspend test execution (until the run command is reissued)

Halt ﬂag off = continue test execution (immediately after completion of

error report)

Before replacing a FRU identiﬁed by SYSEX:

1. Make sure that the module in the designated slot is the correct module for

the slot.

2. Make sure that all switches and jumpers are set correctly on the module.

3. Check any cable connections.

4. Reseat modules installed in the EISA bus slots.

Now, rerun SYSEX. If the same FRU is called out again, replace the FRU.

System Exerciser 3–7