75
INPUT ERRORS AND RESPONSES
ADDR (Byte 1) Error
Display disregards any message where the second byte is not FF. No response
required.
IHCHK (Byte 6) Error
If the IHCHK is incorrect, the display should respond with a NAK message and no
data field. CMD0, CMD1 and CMD3 should be sent back as received.
ATTN (Byte 0) Error
Display disregards any message not starting with 07. No response required.
CMD (Byte 2/3/4) Error
If CMD0/CMD1/CMD2 does not match any of the fourteen legitimate combinations,
the display should respond with the following response:
ATTN
ADDR
CMD0
CMD1
CMD2
LEN
IHCHK
0x15
0xFF
0x74
0x41
0x4E
0x00
0x1D
LEN (Byte 5) Error
If the word count is something other than 01 for BRI, BRM, BZZ, DND, DNV, CMD,
MCC, TMP and BRT inputs, or 00 for ETC, MAN, SNB, SWI, VER or TYP inputs the
display should respond with a NAK message as delineated below.
Request Elapsed Time Counter (ETC) response:
ATTN
ADDR
CMD0
CMD1
CMD2
LEN
IHCHK
0x15
0xFF
0x45
0x54
0x43
0x00
0x 0F
Request Manufacturer ID (MAN) response:
ATTN
ADDR
CMD0
CMD1
CMD2
LEN
IHCHK
0x15
0xFF
0x4D
0x41
0x4E
0x00
0x0F
Request Serial Number (SNB) response:
ATTN
ADDR
CMD0
CMD1
CMD2
LEN
IHCHK
0x15
0xFF
0x53
0x4E
0x42
0x00
0x08
Request Display Firmware Version (SWI) response:
ATTN
ADDR
CMD0
CMD1
CMD2
LEN
IHCHK
0x15
0xFF
0x53
0x57
0x49
0x00
0xF8