Yokogawa Touch Screen GP20 - Manual (Page 69)

2-55
IM 04L51B01-17EN
Commands and Responses
1
2
App
Binary Output
The responses to output commands consisting of binary data output requests are in binary.
Format
The following figure shows the binary output format. The GX/GP adds a header to the front
of binary output data and a checksum at the end. The request data is entered in the data
block.
'E' 'B' CR LF
Data block
Data length
Data sum
Flag Reserved area 1
Reserved area 2 Header sum
1 byte
2 bytes
4 bytes
EBCRLF
The EBCRLF block stores ASCII code “E,” ASCII code “B,” followed by “CR” “LF.” This
indicates that the output data is binary.
Data length (32 bits, big endian)
The data length block indicates the length of “flag + reserved area 1 + reserved area 2 +
header sum + data block + data sum” in bytes.
Flag (16 bits, big endian)
The flag block indicates information of the entire data block.
Bit Flag Value Flag Meaning
0 1
15 Always zero Not used
14 No Yes Data sum inclusion
13 Always zero Not used
:
1
0 Intermediate
data
Last data If the output data is continuous data, this flag
indicates whether the last value in the data block
is intermediate data or last data.
Reserved area 1 (16 bits), reserved area 2 to (16 bits)
Not used
Header sum (16 bits, big endian)
The header sum block indicates the sum of “data length + flag + reserved area 1 + reserved
area 2.”
2.9 Responses to Commands