FRIENDCOM FC-702C User manual

FC-702C Ultrasonic Water
Meter User Manual（05）
LoRaWAN Terminal Series
Version 1.1
Date: 2021-01
www.friendcom.com

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Friendcom has always been committed to technological innovation. Our aim is to
provide customers with timely and comprehensive service. For any assistance,
please contact our Shenzhen headquarters:
FRIENDCOM TECHNOLOGY CO., LTD.
7th Floor, 17 Building, Guangqian Industrial Park, Xili Town, Nanshan District, Shenzhen,
518055, China
Tel: [phone] [phone]
Fax: [phone]
For technical support, or to report documentation errors, please visit:
http://www.friendcom.com
Or email to: [email protected]
NOTICE
Information in this document has been carefully reviewed and is considered to be accurate.
However, Friendcom assumes no liability resulting from any inaccuracies or omissions in
this document, or from use of the information obtained herein. Friendcom reserves the right
to make changes to any products described herein and reserves the right to revise this
document and to make changes from time to time in content hereof with no obligation to
notify any person of revisions or changes. Friendcom does not assume any liability arising
out of the application or use of any product described herein.
COPYRIGHTS
This manual and Friendcom products described herein may include or describe copyrighted
Friendcom material and are considered technical proprietary of Friendcom CO., LTD.
Accordingly, any copyrighted material of Friendcom and its licensors contained herein or in
Friendcom products described in this manual may not be copied, reproduced, distributed,
merged or modified in any manner without the express written permission of Friendcom.
TRADEMARKS
and Friendcom logo are registered Trademarks. All other product or
service names which are mentioned in this document are the property of their respective
owners.
Copyright © Friendcom Communications 2020. All rights reserved.

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About This Document
Scope
Scope of this document is to present features and application of Friendcom FC-702C
Ultrasonic Water Meter
Audience
This document is intended for
system engineers (SEs),
application engineers,
and test engineers.
Related Documents
Friendcom FC-702C Ultrasonic Water Meter Datasheet
Friendcom FC-702C Ultrasonic Water Meter Configuration Guide
Conventions
Symbol
Indication
This warning symbol means danger. You are in a situation that could cause fatal device
damage or even bodily damage.
Means reader be careful. In this situation, you might perform an action that could result
in module or product damages.
Means note or tips for readers to use the module.

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History
Issue
Date
Change
1.0
2020-12
Initial draft
1.1
2021-01
Upgrade the Magnet activation position
Upgrade the server platform information.

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Content
About This Document..................................................................................................................................................... 2
1Introduction................................................................................................................................................................. 5
1.1 Safety Recommendations................................................................................................................................ 5
2Product Concept.......................................................................................................................................................... 5
2.1 General Description..........................................................................................................................................5
2.2 Key Features..................................................................................................................................................... 6
2.3 Specifications....................................................................................................................................................6
3Data Format and Setting Command............................................................................................................................9
3.1 Data Format of Reporting................................................................................................................................ 9
3.2 Setting Command...........................................................................................................................................11
4Parameters Configuration..........................................................................................................................................14
4.1 Parameters Configuration.............................................................................................................................. 14
4.1.1 Wireless Configuration Mode.............................................................................................................14
4.1.2 Entering Configuration Mode............................................................................................................. 14
5Dimensions and Installation...................................................................................................................................... 16
5.1 Dimensions.....................................................................................................................................................16
5.2 Installation Requirements.............................................................................................................................. 16
5.2.1 Horizontal Installation.........................................................................................................................17
5.2.2 Vertical Installation............................................................................................................................. 18
5.2.3 Poor Installation (Horizontal)..............................................................................................................18
5.3 Common Examples of Incorrect Installations................................................................................................ 19
5.4 Daily Maintenance......................................................................................................................................... 21
6Transportantion and Storage.....................................................................................................................................21
Table Index
Table 2- 1 Specifications of FC-702C Ultrasonic Water Meter............................................................................ 7
Table 3- 1 Format of commands...................................................................................................................... 11
Figure Index
Figure 4- 1 Magnet activation position............................................................................................................15

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1Introduction
This document describes the technical parameters and key functions which are connected
with customers’ applications, and it can help customers quickly understand the data format,
as well as other related information of Ultrasonic Water Meter.
1.1 Safety Recommendations
Ensure that this product is used in compliant with the requirements of the country and the
environment, the following safety precautions must be observed during all phases of the
operation, such as usage, service or repair of wireless pulse acquisition products. If not so,
Friendcom assumes no liability for customers’ failure to comply with these precautions.
Full attention must be given to driving at all times in order to reduce the risk
of an accident. Using the terminal while driving causes distraction and can
lead to an accident. Please comply with laws and regulations restricting the
use of wireless devices while driving.
Wireless devices may cause interference on sensitive medical equipment,
so please be aware of the restrictions on the use of wireless devices when in
hospitals, clinics or other healthcare facilities.
The wireless terminal contains a transmitter and receiver. RF interference
can occur if it is used close to other electric equipment.
Do not use this product at any places with a risk of fire or potentially
explosive atmospheres such as gasoline stations, oil refineries, etc.
2Product Concept
2.1 General Description
Ultrasonic water meter is a kind of high precision water meter. Using LoRaWAN technology,

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it can support the flow reporting, remote on-off valve control, fault warning and other
functions, which greatly facilitates the statistics and management of users' water
consumption by the management department.
The product implements the standards of "GB/T 778 for Measuring Water Flow in Closed
Full Pipe for Drinking Cold Water Meter and Hot Water Meter" and the verification
regulations of "JJG 162-2009 Cold Water Meter".
2.2 Key Features
The following shows the key features of FC-702C Ultrasonic Water Meter.
Valve integrated on the meter, fully wrapped structure, anti-damage
With self-diagnosis function: battery power alarm, empty pipe alarm, reverse flow alarm,
over range alarm, water temperature alarm etc.
Advanced flow measurement method and intelligent data error correction technology,
high measurement accuracy and stability
Large capacity lithium battery, can meet the current demand of valve action.The whole
machine can meet the service life of 10 yearsLong range wireless data transmission.
Communication range up to 15km (In visibility conditions)
MAC Layer: LoRaWAN ®
Multi-band support EU433, CN470, EU868, US915, AU915, IN865, AU923-2.
Configurable reporting interval.
Air wireless configuration.
IP Rating: IP68
Lifetime depends from the device location and reporting interval.
2.3 Specifications
The following table describes the specifications of FC-702C Ultrasonic Water Meter.

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Table 2- 1 Specifications of FC-702C Ultrasonic Water Meter
Specifications
Description
Operating conditions
Operating temperature: -40 °C to +70 °C
Operating humidity: 5%RH to 95%RH
Cumulative volume resolution
0.001M (at use) 0.00001M (at verification)
Current flow resolution
0.001 m3/h (when in use) 0.001 m3/h (when verification)
Static operating current
< 6uA
Battery life
10 years
Number of LCD display
eight
Temperature rating
T30
Pressure rating
MAP16
Pressure loss rating
△p40
Environmental Hardness Rating
Class C
IP Rating
IP68
Accuracy grade
Class 2
Electromagnetic environment level
E1
Installation
Horizontal or vertical
Sensitivity level of
upper/downstream flow field
U5/D3
the ratio of measurement range Q3
/ Q1
125, 160 (default), 200

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Diameter range
DN15 ~ DN25
Commonly used traffic Q3
DN15: 2.5 m3/ h
DN20: 4.0 m3/ h
DN25: 6.3 m3/ h
Radio characteristics
Tx Power: Max. 20dBm
Rx Sensitivity: < -138dBm
Communication range
Up to 15km (In visibility conditions)
Frequency bands
EU433, CN470, EU868, US915, AU915, IN865, AU923-2
MAC Layer
LoRaWAN ®
Antenna option
Build-in Antenna
Configuration
Over-the-air
Upgrade
FOTA
Communication module certificate
approval
CE, FCC, LoRa Alliance*, ANATEL
“*” Means for features and certifications in planning

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3Data Format and Setting Command
3.1 Data Format of Reporting
Ultrasonic Water Meter actively reports data according to the set period. The format of
reported data frame can be set to three types: meter reading 1, meter reading 2, meter
reading 3 . The information reported in the there formats is different, as follows:
‘Meter reading 1’ data frame example:
FEFE 68 10 75700200357568 81 16 901F 00 2C 01020000 2C
05010000 38341331122020 0102 13 16
Bytes
Remarks
FEFE
Leading code (two bytes)
68
Frame start character
10
Instrument type
75700200357568
Address (7 bytes)(table address).
81
Control code
16
Data length
901F
Data id
00
SER
2C
Unit (refer to CJ-T188-2004 standard 8.3.1) (xxxxxx.xxm3)
01020000
Current cumulative flow (refer to CJ-T188-2004 standard 8.3)(2.01m3)
2C
Unit (xxxxxx.xxm3)
05010000
Settlement day cumulative traffic (indicating that the last record was
1.05m3)
38341331122020
Real time (YYYYMMDDHHMMSS) : 2020-12-31 13:34:38
0102
state (see CJ - T188-2004 standard 8.3.2)ST1, ST2 : Current Valve is
closed；WARNING: Empty Pipe
ST1：
BIT1,BIT0, 00: on, 01: off, 11: abnormal
BIT2,1: Battery power alarm,0: Normal
ST2：
BIT0,1: Battery power alarm,0: Normal
BIT1,1: Empty Pipe alarm,0: Normal
BIT2,1: reverse flow alarm,0: normal
BIT3,1: overrange alarm,0: normal
BIT4,1: water temperature alarm, 0: normal
BIT5,1:EE fault,0: Normal

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BIT6,1: Water inlet flow sensor alarm,0: Normal
BIT7,1: Backwater flow sensor alarm,0: Normal
13
Check byte
16
The terminator
‘Meter reading 2’ data frame example:
FEFE 68 10 75700200357568 81 08 D121 00 2C 05010000 18 16
Bytes
Remarks
FEFE
Leading code (two bytes)
68
Frame start character
10
Instrument type
75700200357568
Address (7 bytes) (table address)
81
Control code
8
Data length
D121
Data id (20~79)
0
SER
2C
Unit (refer to CJ-T188-2004 standard 8.3.1) (XXXXXX.XXM3)
05010000
Cumulative flow for the last X settlement day(1.05 m3)
18
Check byte
16
The terminator
‘Meter reading 3’ data frame example:
FEFE 68 10 75700200357568 B1 1C 0100 00 2C 29040000 35
73650000 2C 29040000 2C 00000000 502300 0000 9D 16
Bytes
Remarks
FEFE
Leading code (two bytes)
68
Frame start character
10
Instrument type
75700200357
568
Address (7 bytes) : (table address).
B1
Control code
1C
Data length
100
Data id
00
SER
2C
Unit (refer to CJ-T188-2004 standard 8.3.1): (XXXXXX.XXM3)
29040000
Current cumulative flow (refer to CJ-T188-2004 standard 8.3) : (4.29 m3)
35
Unit (refer to CJ-T188-2004 standard 8.3.1): (XXXX.XXXXM3 /h)

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73650000
Current instantaneous flow (refer to CJ-T188-2004 standard 8.3) : (0.6573
m3/h)
2C
Unit (refer to CJ-T188-2004 standard 8.3.1): (XXXXXX.XXM3)
29040000
Current forward cumulative flow (refer to CJ-T188-2004 standard 8.3) :
(representing 4.29 m3)
2C
Unit (refer to CJ-T188-2004 standard 8.3.1): (XXXXXX.XXM3)
0000
Current reverse cumulative flow (refer to CJ-T188-2004 standard 8.3) : (for
0.00 m3)
502300
Water supply temperature (refer to CJ-T188-2004 standard 8.3) :(23.50 ℃)
0000
Status (refer to CJ-T188-2004 standard 8.3.2): Status normal
ST1：
BIT1,BIT0, 00: on, 01: off, 11: abnormal
BIT2,1: Battery power alarm,0: Normal
ST2：
BIT0,1: Battery power alarm,0: Normal
BIT1,1: Empty Pipe alarm,0: Normal
BIT2,1: reverse flow alarm,0: normal
BIT3,1: overrange alarm,0: normal
BIT4,1: water temperature alarm, 0: normal
BIT5,1:EE fault,0: Normal
BIT6,1: Water inlet flow sensor alarm,0: Normal
BIT7,1: Backwater flow sensor alarm,0: Normal
9D
Check byte
16
The terminator
3.2 Setting Command
Parameters of Ultrasonic Water Meter can be set and read by AT command, the format of
commands is shown in the following table.
Table 3- 1 Format of commands
Command
Note
Ack (Success)
Ack (Failure)
AT+I
Query the current
electronic index, the unit
is m³
InitValue = xxx.xx
Error
AT+T
RTC real-time clock
query
RTC real-time =
year.month.day_week_hour
Error

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:minute:second
AT+T=xx.xx.xx x xx:x
x:xx
RTC real-time clock se
tting, the format is xx.x
x.xx_x_xx:xx:xx (year.m
onth.day_week_hour:mi
nute:second)
Note that Saturday and
Sunday, correspond to
number 6 and 7.
For example, to set the
time On January 21,
2018, Sunday at 14:00,
the input command is as
follows:
AT+T=18.01.21 7
14:00:00
Set RTC Success
Error
AT+DA
Check the product
address
Address = ********
AT+DA=“Device
address”
Set the product's mailing
address, 4 bytes of
hexadecimal digits.
Example: AT+DA
=ABCDEF01
Set Address = ABCDEF01
AT+VP
Read pull-up resistor
configuration of external
Vcc and two pulse
sampling ports
Vcc = **(ON), Pull Up =
**(OFF)
AT+VP=”vcc
state”,”Pull up state”
Set pull-up resistor of
external Vcc and two
pulse sampling ports.
ON is open
OFF is close
Example: AT+VP=ON,
OFF
Set Vcc = ON, Pull Up =
OFF
AT+RC
Read reporting period
Report Cycle = ****
AT+RC=“Report cycle”
Set the reporting period
in minutes.
Valid range: 1-99999
Example: AT+RC=1440
Set Report Cycle = ****
AT+RST
Reset the device
Reset now
AT+V
Query the current
software version
version:0.3
Error

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AT+DR=band
Set the frequency band.
For example, set the
band to AU915. The
command is:
AT+DR=AU915.
+DR: XXXXXX
AT+CH=NUM, chm-chn
Set channel. The
transmit channel of the
module must be
consistent with the
receive channel of the
gateway.
For example, set the
channel to 0-7. The
command is:
AT+CH=NUM, 0-7
+CH: NUM, 0-7
AT+POWER=xx
Set the transmit power ,
For example, set the
transmit power to
20dBm, the command is
AT+POWER=20
+POWER: 20
AT+ID=DevAddr,
"xxxxxxxx"
Set DevAddr, "xxxxxxxx"
to an 8-digit
hexadecimal number.
For example, set the
DevAddr ID to
01234567, the
command is:
AT+ID=DevAddr,
"01234567"
+ID: DevAddr, 01:23:45:67
AT+ID
Query LoRaWAN
module ID information:
DevAddr, DevEui,
AppEui
+ID:DevAddr, 00:F3:50:02
+ID:DevEui,
47:A7:CA:DD:00:2B:00:49
+ID:AppEui,
52:69:73:69:6E:67:48:46
AT+MODE=LWOTAA
Set the module to
LWOTAA mode
+MODE:LWOTAA
AT+MODE=LWABP
Set the module to
LWABP mode
+MODE:LWABP

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4Parameters Configuration
4.1 Parameters Configuration
Before using the Ultrasonic Water Meter, we need to configure some parameters, such as
initial index, RTC real-time clock, reporting period, reporting frame type and other
information. The configuration mode supports wireless. For detailed operation steps, users
can refer to ‘Friendcom FC-702C Ultrasonic Water Meter Configuration Guide’.
4.1.1 Wireless Configuration Mode
Plug the wireless USB adapter FC-714-USB into your computer and install the correct driver
to configure the product wirelessly.
4.1.2 Entering Configuration Mode
Ultrasonic Water Meter can be activated by magnet to enter configuration mode. Both the
wired configuration mode and wireless configuration mode need to be activated before
parameters configured.
The sensor inside the product is triggered by the magnet to put the product into the
configuration mode, and then the configuration command must be sent within 30 seconds. If
the product does not detect the configuration command in 30 seconds, the configuration
mode will be exited. Once the command is received, the product will keep in configuration
mode for another 30 seconds.
The trigger position is shown in the figure below.

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Figure 4- 1 Magnet activation position
The time that magnet triggers the sensor to connect (the duration from connect to the break)
and the corresponding functions are shown in the following table:
Magnet hold time
Features
Remarks
2s-4s
Report data once
Typically 3s
4s-9s
Configuration mode
Typically 5s
9s-15s
Reset
Typically 12s
>15s
No response
Close magnet detecting function 60s
When the product exits the configuration mode, basing on whether the user has sent a
network access command (AT + JOIN) and whether the current mode is OTAA, it will
automatically join the network if both are satisfied. The network access result can be verified
by triggering whether the data report is successful.
The parameters can be set through AT command, for detailed command information, please
refer to section 3.2.
Magnet activation position

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5Dimensions and Installation
5.1 Dimensions
Nominal diameter DN (mm)
15
20
25
size
Length L (mm)
165
195
225
Width W (mm)
96
96
96
H (mm)
198
198
198
Weight (kg)
0.94
1.01
1.28
Interface
dimensions of
flow pipe
segments
Thread
specification
G 3/4B
G1B
G1 1/4B
Thread length
(mm)
12
12
12
Pipe joint size
Length of pipe
joint (mm)
43
50
58
Thread
specification
R1/2
R3/4
R1
Thread length
(mm)
15
16
18
5.2 Installation Requirements
Precautions Before Installation:
(1) The pipe must be thoroughly cleaned before installing the ultrasonic water meter to avoid
debris damage to the water meter;
(2) Ultrasonic water meter belongs to the more precious precision instrument, pick up and
put down must be careful, prohibit directly pull the meter head or sensor line;Do not close to
a high temperature heat source (such as electric welding, to prevent battery explosion injury
and damage to the instrument);
(3) Special attention should be paid to the installation position of ultrasonic water meter. It
should be avoided to install the water meter on the upper end of the pipe (there will be
bubbles in the pipe section), to avoid installation near the elbow (will produce vortex flow),
and to stay away from pumps and other equipment (will cause pulsating flow);
(4) The upstream and downstream connecting pipes of the ultrasonic water meter should be

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the same size as the caliber of the water meter, and can not be reduced;
(5) The direction indicated by the arrow on the surface of the ultrasonic water meter is the
direction of the water flow and shall not be reversed;
(6) It is recommended that the filter of corresponding caliber be installed in front of the
ultrasonic water meter;The front and back of the meter are equipped with the corresponding
caliber valve and it can be separated from the body, easy to maintenance and repair in the
future.
Because the measuring principle of ultrasonic water meter is different from that of
mechanical water meter, the pipe can not be empty pipe or accumulate more bubbles,
otherwise it will lead to the transmission of ultrasonic signal, resulting in the table does not
count or measurement is inaccurate. For the above reasons, the recommended installation
methods are as follows:
5.2.1 Horizontal Installation
For horizontal installation, it is recommended to install the pipe as follows, and make the
pipe into "U" shape.
In this case, the low ultrasonic water meter pipe can keep full pipe.

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5.2.2 Vertical Installation
For vertical installation, as shown in the figure above, the water flow direction at the water
meter is water at the lower end and water at the upper end.
In this case, the air bubbles can be avoided to accumulate in the water meter measuring
pipe when there is water flowing through.
5.2.3 Poor Installation (Horizontal)
If it is really difficult to implement the recommended horizontal installation conditions due to
the limitation of objective conditions on site, the installation should be at least as shown in
the following figure:

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In the figure, the pipe in front of the water meter can be parallel to the body of the water
meter (eliminating the right-angle bending structure compared to the recommended method),
but the pipe at the back of the water meter must be arranged as shown in the figure to
prevent bubbles from forming in the pipe.
5.3 Common Examples of Incorrect Installations
1), when the table is installed vertically, it must be installed on the straight pipe with upward
flow, because the water flow down the pipe under the gravity of the earth will cause the
phenomenon that the water in the pipe can not be filled, which will lead to meter
measurement is not allowed or even caused by measurement (as shown in Figure C).