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Instruction Manual
6. Communication Protocol
6. 1 General
The ultrasonic flow meter integrates a standard RS-232 communication interface and a
complete set of communication protocols that are compatible with that of the Fuji’s
ultrasonic flow meter.
6.2 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
6.3 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,ddd Q=dd (CR)(LF)
DT(CR)
Return date and time
yy-mm-dd
hh:mm:ss(CR)(LF)
