TF1100-CH transit-time handheld flowmeter manual
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PART-6 COMMUNICATION PROTOCOL
6. 1 GENERAL
The TF1100-CH ultrasonic flow meter integrates a standard RS-232C communication
interface.
6.2 INTERFACE PIN-OUT DEFINITION
Pin 1
OCT
2
RXD
3
TXD
4 not
used
5 GND,
OCT
OUTPUT
-
GND
6 for
battery
recharge,
negative
input,
GND
7
for battery recharge, positive input, +12V
8
+5V
9 not
used
OCT: Pin1(black) and 5 (yellow)
RS232: Pin 2 (brown), 3 (red) and 5(yellow)
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
ddddd(CR)
（
LF
）
