30
FDT-25 Handheld Ultrasonic Flowmeter
FOdddd(CR)
ForcetheFOoutputwith afrequencyinddddHz
ESN(CR)
Return the ESN for the instrument
Dddddddd(CR)(LF)
RING(CR)
Handshaking Request by a MODEM
OK(CR)
Response from a MODEM
No action
GA
Command for GSM messaging
Please contact factory for detail
GB
Command for GSM messaging
GC
Command for GSM messaging
DUMP(CR)
Return the buffer content
In ASCII string format
DUMP0(CR) Clear the whole buffer
In ASCII string format
DUMP1(CR) Return the whole buffer content
InASCII stringFormat,24KB inlength
W
Prefix before an Identification Number in
a network environment. The IDN is a word,
ranging 0-65534.
N
Prefix before an Identification Number in
a network environment. The IDN is a single
byte value, ranging 00-255.
P
Prefix before any command
&
Command connector to make a longer
command by combining up to 6 commands
Notes
*
CR stands for Carriage Return and LF for Line Feed.
**
‘d’ stands for the 0～9digit numbers.
*** @ stands for the key value, e.g., 30H for the ‘0’ key.
§6.3 Protocol Prefix Usage
(1) Prefix P
The prefix P can be added before any command in the above table to have the returning data
followed with two bytes of CRC check sum, which is the adding sum of the original character
string.
Take the DI+(CR) command as an example. Assume that DI+(CR) would 10m3
(CR)(LF)( the string in hexadecimal is 2BH, 31H, 32H, 33H, 34H, 35H, 36H, 37H, 45H, 2BH,
30H, 6DH, 33H, 20H, 0DH, 0AH) , then PDI(CR) would 10m3!F7(CR)(LF).
‘!’ acts as the starter of check sum which is yielded by adding up the string 2BH, 31H, 32H, 33H,
34H, 35H, 36H, 37H, 45H, 2BH, 30H, 6DH, 33H, 20H.
Please note that there will be SPACES (20H) before ‘!’.
