Commands by the serial interface
PCD7.D250
Page 6-12
SAIA-Burgess Electronics Ltd.
(D25-06-E.DOC)
26/770 E1
Demonstration display and hardware tests
These commands execute the tests described in sections 5.3.3 to 5.3.7.
The “POLL” command can be used determine when test has been
completed.
Command
ASCII
Decimal
Hex
Demonstration
display
ESC J
27 74
1B 4A
Display test
ESC @ A
27 64 65
1B 40 41
Keyboard test
ESC @ 9
27 64 57
1B 40 39
LED test
ESC @ L
27 64 76
1B 40 4C
Hardware tests
ESC @ C
27 64 67
1B 40 43
POLL
To determine if the ..D250 is connected and is ready to receive com-
mands, the “poll” message can be sent. If the ..D250 is ready, it returns
an “
SOH
” response character (1 decimal, 01H). If not ready there will be
no response. This is typically used to determine when the ..D250 has
finished its power-up tests.
The poll command is the only command which has a response. It can also
be used to check that the ..D250 is still operational. If it fails, the user
program could take the necessary action to alert the operator that the
..D250 terminal is not responding.
Command
ASCII
Decimal
Hex
POLL
ESC @ B
27 64 66
1B 40 42
Reply from ..D250
if operational
SOH
1
01
