FDT-25 Handheld Ultrasonic Flowmeter
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6. Communication Protocol
§6. 0 General
The series ultrasonic flow meter integrates a standard RS-232C communication interface and a
complete set of communication protocols that are compatible with that of the Fuji’s ultrasonic flow
meter.
§6.1 Interface Pin-out Definition
Pin
1
for battery recharge, positive input
2
RXD
3
TXD
4
not used
5
GND
6
OCT output
7
not used
8
for battery recharge, negative input
9
RING input for connecting a MODEM
§6.2 the Protocol
The protocol is comprised of a set of basic commands that is a string in ASCII format, ending with
a carriage (CR) and line feed (LF). Commonly used commands are listed in the following table.
Command
Function
Data Format
DQD(CR)
Return flow rate per day
±
d.ddddddE
±
dd(CR)(LF)*
DQH(CR)
Return flow rate per hour
±
d.ddddddE
±
dd(CR)(LF)
DQM(CR)
Return flow rate per minute
±
d.ddddddE
±
dd(CR)(LF)
DQS(CR)
Return flow rate per second
±
d.ddddddE
±
dd(CR)(LF)
DV(CR)
Return flow velocity
±
d.ddddddE
±
dd(CR)(LF)
DI+(CR)
Return POS totalizer
±
dddddddE
±
d(CR)(LF)**
DI-(CR)
Return NEG totalizer
±
dddddddE
±
d(CR)(LF)
DIN(CR)
Return NET totalizer
±
dddddddE
±
d(CR)(LF)
DID(CR)
Return Identification Number
ddddd (CR) (LF)
DL(CR)
Return signal strength and quality
S－ddd,dddQ－dd (CR) (LF)
DT(CR)
Return date and time
yy-mm-dd hh:mm:ss(CR) (LF)
M@(CR)***
Send a key value as if a key is pressed
LCD(CR)
Return the current window display
