Ebyte K62-DL20 User manual

K62-DL20
0/4～20mA Analog Transmission Module

Chengdu Ebyte Electronic Technology Co.,Ltd. K62-DL20 User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd. 1
K62-DL20

Chengdu Ebyte Electronic Technology Co.,Ltd. K62-DL20 User Manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd. 2
Contents
Disclaimer .............................................................................................................................................................5
1 Introduction ....................................................................................................................................................... 6
1.1 Features ...................................................................................................................................................... 6
1.2 Basic parameters.........................................................................................................................................7
1.3 Description of Each Part .............................................................................................................................8
1.3.1 Product Dimensions.............................................................................................................................8
1.3.2 Product Interface Description ..............................................................................................................9
1.3.3 Indicator light description..................................................................................................................12
1.4 Internal circuit structure diagram of the product ......................................................................................14
1.4.1The internal principle diagram of the transmitter (collection) end product....................................... 14
1.4.2 The internal principle diagram of the receiving (restore) end product ..............................................15
2 Quick Start .......................................................................................................................................................15
2.1 List of products and accessories ............................................................................................................... 16
2.2 Quick access............................................................................................................................................. 17
2.2.1 Step 1: Connect the antenna and power supply to the product ..........................................................17
2.2.2 Step 2: Transmitting (acquisition) end product signal input wiring ..................................................17
2.2.3 Step 3: Receiving (restoration) end of the product signal output wiring ...........................................18
2.2.4 Step 4: Power on the product and observe the status of the indicator lights ..................................... 19
2.2.5 Step 5: On-site installation ................................................................................................................ 20
2.3 Model selection overview .........................................................................................................................20
2.3.1 Product model selection table............................................................................................................20
2.3.2 Product model naming rules.............................................................................................................. 22
3 Hardware connection and related knowledge ..................................................................................................23
3.1 Power Hardware Connection ....................................................................................................................23
3.1.1 Power supply selection ...................................................................................................................... 23
3.1.2 Power Connection ............................................................................................................................. 23
3.1.3 Precautions and instructions for power connection ...........................................................................23
3.2 Hardware connection of the first communication method....................................................................... 24
3.3 Hardware connection of the second communication method ...................................................................25
3.4 Analog acquisition input and restore output hardware connection.......................................................... 26

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3.4.1 Two -wire acquisition input (AI) connection .................................................................................... 26
3.4.2 Three-wire acquisition input (AI) connection ................................................................................... 27
3.4.3 wire acquisition input (AI) connection ..............................................................................................27
3.4.4 Analog restore output (AO) wiring ................................................................................................... 28
3.4.5 Analog impedance and other information ......................................................................................... 28
4 Configuration software driver installation, each function parameter reading, description and writing ..........29
4.1 Configuration software tools and driver installation ................................................................................ 29
4.1.1 Configuration software tools and driver installation package download .......................................... 29
4.1.2 Configuration software tools and driver installation ......................................................................... 29
4.1.3 Introduction to configuration software tool interface ........................................................................31
4.2 Reading and changing the basic parameters of the product..................................................................... 32
4.2.1 Product hardware connection and COM port selection .....................................................................32
4.2.2 Reading the basic parameters of the product .....................................................................................33
4.2.3 Serial port parameter change write and restore default ..................................................................... 34
4.3 I/O configuration parameter reading, description and writing ............................................................35
4.3.1 I/O configuration parameter reading ................................................................................................. 35
4.3.2 I/O configuration parameter description ............................................................................................36
4.3.3 I/O configuration parameter writing ..................................................................................................37
5 The second communication mode parameter reading, description and writing .............................................. 38
5.1 The second communication method: LoRa ..............................................................................................38
5.1.1 LoRa parameter reading.................................................................................................................... 38
5.1.2 LoRa parameter description...............................................................................................................39
5.1.3 LoRa parameter configuration write..................................................................................................39
5.1.4 LoRa configuration parameter range .................................................................................................40
6 ModBus ........................................................................................................................................................... 40
6.1 ModBus address table ......................................................................................................................... 40
6.1.1 Function code and register address table ...........................................................................................40
6.1.2 Change ModBus address................................................................................................................... 41
6.1.3 Read analog AI input .........................................................................................................................41
6.1.4 Read analog AO output ..................................................................................................................... 42
7 Precautions for use .......................................................................................................................................... 42
8 FAQ ................................................................................................................................................................. 43

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8.1 General Questions .................................................................................................................................... 43
8.2 LoRa-related issues .................................................................................................................................. 44
8.3 Analog input and output related issues .....................................................................................................45
Revision history ..................................................................................................................................................46
About us..............................................................................................................................................................46

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Disclaimer
EBYTE reserves all rights to this document and the information contained herein.
Products, names, logos and designs described herein may in whole or in part be
subject to intellectual property rights. Reproduction, use, modification or disclosure to
third parties of this document or any part thereof without the express permission of
EBYTE is strictly prohibited.
The information contained herein is provided “as is” and EBYTE assumes no
liability for the use of the information. No warranty, either express or implied, is given,
including but not limited, with respect to the accuracy, correctness, reliability and
fitness for a particular purpose of the information. This document may be revised by
EBYTE at any time. For most recent documents, visit www.ebyte.com.

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1 Introduction
1. This product is a pair transmission function product. Function: The transmitter collects 4 channels of analog
signals (0/4 to 20mA) and transmits the data to the receiver via wireless (LoRa spread spectrum), and the receiver
restores 4 channels of analog signals (0/4 to 20mA).
2. Model No. K62-DL20, including transmitting (collecting) end: K62D-40RL20; receiving (reducing) end:
K62D-04RL20.
Picture 1-1
3. The module also has a 485 data pass-through function. The 485 data from the transmitter and receiver can be
transmitted through LoRa wireless communication.
4. The product is highly easy to use, avoiding long-distance cable distribution, greatly reducing enterprise
labor/material costs, and reducing construction and maintenance difficulties.
5. For industrial users, all industrial grade design, after extensive testing, stable and reliable quality.
6. Construction-free installation: It can replace the link cable and transmit far away, eliminating the trouble of cable
construction.
7. Programming-free design: no programming required, all parameters can be configured through the upper
computer software, easy to use and reliable operation.
8. Automatic error correction: The terminal has strong error correction capability and can actively correct the
interfered packets, greatly improving transmission reliability.
1.1 Features
★4 x 0/4 to 20mA analog inputs supported on the transmitting (acquisition) side;
★Receive (restore) side supports 4-channel 0/4～20mA analog output;
★With 485 wireless data transmission function;
★Hardware watchdog for high reliability and recoverability;
★Good over-current, over-voltage, anti-reverse connection, anti-misconnection and other protection functions;
★Rich indicators, a comprehensive view of the status, easy to troubleshoot;
★Signal refresh rate is adjustable, supporting 0.2 to 5s (seconds), making 0/4 to 20mA current more continuous
and sensitive;
★Communication channels can be set, up to 83 channels for data communication in one area, without interfering
with each other;

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★Wireless 433Mhz (LoRa spread spectrum) communication power of 0.1W, communication distance of 4000
meters (open), common scene applications within 500 meters can be stable transmission;
★Customized functions are supported, please contact sales staff.
1.2 Basic parameters
Table 1.1 Basic parameters
category
project
Details
AI input
AO output
Number of AI/AO
channels
4
Interface Type
current type
AI/AO input method
0/4 ～20mA
Connection method
5.08mm industrial grade plug-in terminal
Refresh rate
configuration range
0.2～5s/time (default: 1s/time)
AI analog signal input
0/4～20mA acquisition. Acquisition accuracy: ≤±0.03mA. Acquisition
resolution: 0.001mA. Active signal needs to be connected, and the constant
current source voltage needs to be ≥10V. Input maximum current
Imax≤28mA, overcurrent may cause product damage.
AO analog signal
output
0/4～20mA output. Output error: ≤±0.03mA. Output accuracy: 0.001mA.
The output is an active signal: constant current source output. Load
blocking needs to be ≤500Ω.
physical
characteristics
Product Size
110*84.32*25.3mm (L*W*H)
product weight
164±5g
Package weight
710±10g
working
environment
Operating temperature
-40℃～85℃
storage temperature
-60℃～125℃
Working humidity
5% to 95% RH
Storage humidity
1% to 95%
waterproof level
Not waterproof, with certain moisture resistance
Dust rating
Completely blocks dust
power supply
Operating Voltage
DC voltage: DC 8V ~ 28V
Power connector type
5.08mm industrial grade plug-in terminal
Transmitter power
consumption
Pmax (maximum power consumption) = 0.8W,
Pav (average power consumption) ≤ 0.5W
Receiver power
consumption
Pmax (maximum power consumption) = 5W,
Pav (average power consumption) ≤ 2.5W
first method of
communication
Types of
485
Whether with isolation
no
Connection method
5.08mm industrial grade plug-in terminal
second method
of
communication
Types of
LoRa Wireless Spread Spectrum (SX1262)
transmit power
160mW (22dBm)
working frequency
410.125～493.125Mhz (default 410.125Mhz)

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Measured distance
4000 meters (clear and open environment, maximum power, airspeed 2.4K,
antenna gain 5dBi, feeder length 1m);
the recommended practical engineering application distance is less than or
equal to 1000 meters.
air speed
2.4～62.5kbps (default 4.8kbps)
Receive sensitivity
-138dbm
Actual frequency
calculation formula
Actual frequency=410.125Mhz+channel*1Mhz
number of channels
83
Matching Antenna
Interface/Impedance/F
requency
SMA female thread inner needle/equivalent impedance 50Ω/433Mhz
1.3 Description of Each Part
1.3.1 Product Dimensions
Note:
1. The size of the sender and receiver are the same, see the figure below.
2. Figure 1-2 below is the reference size of the product, the error is ±0.3mm, please refer to the actual product.

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Figure 1-2 Product Dimensions
1.3.2 Product Interface Description
(1) Interface description of the transmitter (collection) end product.

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Figure 1-3 Display of the transmitter (collection) end product interface
Table 1.3.2 Pin Function Definition of Transmitter (Acquisition) End Products
serial
number
Port and
Other
Definitions
Function
illustrate
1
PE
protective earth
terminal
Lightning protection grounding. If the ground lead is good, it is
recommended to connect the product casing to the ground;
otherwise, it is OK.
2
+
Positive power
supply
The power input is positive, and the DC input voltage range is 8-28V.
3
-
power ground
Power input negative (0V).
4
B/RX
Communication
interface B/RXD
485 interface B/(RS232_RXD).
5
A/TX
Communication
interface A/TXD
485 interface A/(RS232_TXD).
6
G
communication port
485 ground (can not be connected) / RS232 signal ground (0V).
7
second
communicat
ion interface
Antenna
port/network port
433Mhz antenna port/network port socket
8
AI1
Analog input 1
channel
0/4～20mA analog signal input channel 1.
9
GND
input negative
Input negative (0V).
10
AI2
Analog input 2
channels
0/4～20mA analog signal input channel 2.
11
GND
input negative
Input negative (0V).
12
AI3
Analog input 3
channels
0/4～20mA analog signal input channel 3.
13
GND
input negative
Input negative (0V).

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14
AI4
Analog input 4
channels
0/4～20mA analog signal input channel 4.
15
GND
input negative
Input negative (0V).
16
without
Leave it in the air, do not connect.
17
SFR
reset
Press and hold for 3 seconds to restore the factory settings (Set
Factory Reset) (indicated by the status of the RUN light).
18
SIM
SIM card slot
Insert a data IoT card or a phone card with a sufficient data plan.
(2) Receive (restore) end product interface description.
Figure 1-4 Display of the product interface on the receiving (restore) end
Table 1-4 Definition of pin function of receiving (recovery) end product
serial
number
Port and
Other
Definitions
Function
illustrate
1
PE
protective earth
terminal
Lightning protection grounding. If the ground lead is good, it is
recommended to connect the product casing to the ground; otherwise,
it is OK.
2
+
Positive power
supply
The power input is positive, and the DC input voltage range is 8-28V.
3
-
power ground
Power input negative (0V).
4
B/RX
Communication
interface B/RXD
485 interface B/(RS232_RXD).
5
A/TX
Communication
interface A/TXD
485 interface A/(RS232_TXD).
6
G
communication
port
485 ground (can not be connected) / RS232 signal ground (0V).
7
second
communicati
Antenna
port/network port
433Mhz antenna port/network port socket

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on interface
8
AO1
Analog input 1
channel
0/4～20mA analog signal output channel 1.
9
GND
input negative
Input negative (0V).
10
AO2
Analog input 2
channels
0/4～20mA analog signal output channel 2.
11
GND
input negative
Input negative (0V).
12
AO3
Analog input 3
channels
0/4～20mA analog signal output channel 3.
13
GND
input negative
Input negative (0V).
14
AO4
Analog input 4
channels
0/4～20mA analog signal output channel 4.
15
GND
input negative
Input negative (0V).
16
without
Leave it in the air, do not connect.
17
SFR
reset
Press and hold for 3 seconds to restore the factory settings (Set
Factory Reset) (indicated by the status of the RUN light).
18
SIM
SIM card slot
Insert a data IoT card and a phone card with a data plan.
1.3.3 Indicator light description
(1) LED light indication on the transmitting (collecting) end, as shown.
Figure 1-5
Table 1-5 Function table of analog input module

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serial
number
Indicator name
illustrate
1
RUN
Flashing for 0.5 seconds: indicates that the product is in normal operation;
After 3 seconds of steady light, recovery will flash for 0.5 seconds: long
press the button for 3 seconds, it means the factory reset is successful.
2
NET
Steady on: The second communication interface is connected successfully;
Off: The second communication interface is disconnected.
3
TXD
Blinking: Indicates that the product sends out a data signal.
4
RXD
Blinking: Indicates that the product has received a data signal.
5
AI1
Always on: 0/4～20mA signal input is detected;
Off: 0/4～20mA signal input is not detected.
6
AI2
Always on: 0/4～20mA signal input is detected;
Off: 0/4～20mA signal input is not detected.
7
AI3
Always on: 0/4～20mA signal input is detected;
Off: 0/4～20mA signal input is not detected.
8
AI4
Always on: 0/4～20mA signal input is detected;
Off: 0/4～20mA signal input is not detected.
(2) LED light indication on the receiving (restore) end, as shown.
Figure 1-6 Indicator light of analog output module
Table 1-6 Function table of analog output module
serial
Indicator name
illustrate

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number
1
RUN
Flashing for 0.5 seconds: indicates that the product is in normal operation;
After 3 seconds of steady light, recovery will flash for 0.5 seconds: long
press the button for 3 seconds, it means the factory reset is successful.
2
NET
Steady on: The second communication interface is connected successfully;
Off: The second communication interface is disconnected.
3
TXD
Blinking: Indicates that the product sends out a data signal.
4
RXD
Blinking: Indicates that the product has received a data signal.
5
AO1
Always on: output 0/4～20mA signal;
Off: 0/4～20mA signal is not output.
6
AO2
Always on: output 0/4～20mA signal;
Off: 0/4～20mA signal is not output.
7
AO3
Always on: output 0/4～20mA signal;
Off: 0/4～20mA signal is not output.
8
AO4
Always on: output 0/4～20mA signal;
Off: 0/4～20mA signal is not output.
1.4 Internal circuit structure diagram of the product
1.4.1The internal principle diagram of the transmitter (collection) end product
Internal principle diagram of analog input product

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1.4.2 The internal principle diagram of the receiving (restore) end product
Internal schematic diagram of analog output product
2 Quick Start
This chapter is a quick start introduction for this product, users are recommended to read this chapter carefully and
follow the instructions once. It will provide a systematic understanding of this product, and users can also select the
chapters that interest you to read as needed. For specific details and instructions, please refer to the subsequent chapters.

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2.1 List of products and accessories
Figure 2-1 The complete set of products including modules and accessories
Table 2-1 The complete set of products includes modules and accessories
name
model
quantity
0/4～20mA analog input module
K62D-40RL20
1
0/4～20mA analog output module
K62D-04RL20
1
12V/1A adapter power supply
CQ12-120100-CC
2
Power adapter cable
DYX01-A
2
Suction cup antenna (SMA inner thread inner needle/equivalent
impedance 50Ω/433Mhz/3.5dBi gain/feeder length 1 meter)
TX433-XPL-100
2
USB to 485 tool
K1T-UR0
1
Slotted screwdriver
2*50mm slotted
screwdriver
1

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2.2 Quick access
2.2.1 Step 1: Connect the antenna and power supply to the product
(1) Connect the antenna and power supply as shown in the figure below.
1、Antenna connection: Remove the antenna caps of K62-40 and K62-04 products, and tighten the 433Mhz band "suction
cup antenna" clockwise on the product; (For more details, see "The second communication mode is: LoRa spread
spectrum hardware connection, installation "chapter)
2、Power connection: connect the "red wire" of the "power adapter cable" to the "+" pole of the product, and the "black
wire" to the "-" pole of the product. "Connect the "12V/1A adapter power supply" to the "power adapter cable".
(For more details, see the "Power Supply Hardware Connection" section)
Figure 2-2 Product connection antenna and power supply
(2) Notes.
1、When wiring, please do not connect the wrong port, so as not to damage the product!
2, the transmission of paired products between RF antennas, need to be as open as possible and as far as possible can be
seen directly; RF antennas as far as possible around away from: walls, metal shielding, trees, hills, large buildings, etc..
3, the top of the RF antenna can not be attached to the metal, wall and other objects that have great attenuation effect on
RF, so as not to affect the transmission of RF signals.
4, the distance between the product RF antenna is best to keep 1 meter and above. High-power RF products from the RF
antenna distance is too close, the receiving end can not receive the data. (For more details, please see the "Frequently
Asked Questions and Solutions (FAQ)" section)
2.2.2 Step 2: Transmitting (acquisition) end product signal input wiring
(1) In accordance with Figure 2-3 below, connect the 0/4-20mA analog signal generator (or sensor, etc.) output port to the
AI and GND interface of the K62-40 acquisition end of this product. (The specific wiring method of the sensor's two,
three, four-wire system, see: "analog acquisition input and restore the output hardware connection")

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(2) Notes.
1, the user needs to confirm that the sensor belongs to the several-wire system sensors, and connected with wires in
accordance with the wiring schematic.
2, the terminal connection wire, pay attention to the terminal conductive part can not be pressed to the wire insulation
layer, so as to avoid poor contact, causing abnormalities.
(For more details, please see the "Frequently Asked Questions and Solutions (FAQ)" section)
2.2.3 Step 3: Receiving (restoration) end of the product signal output wiring
(1) In accordance with Figure 2-3 below, connect the AO and GND of the reduction end of this product K62-04 to the
signal receiving "positive" and "negative" terminals of the analog acquisition equipment with wires respectively (or
connect to a multimeter, note that the multimeter position needs to be set to greater than 20mA current level, the "red
meter pen" connected to the product "AO", "black meter pen" connected to the product "GND ("), and tighten the screws
on the plug-in terminals of this product. (This part of the wiring schematic see: "analog reduction output (AO) wiring")
(2) Notes.
1, the output of this product is an active signal: constant current source output, the load resistance value needs to be ≤
500Ω.
2, using a multimeter measurement, pay attention to the multimeter gear must be correct, so as not to damage the external
table, or lead to large measurement errors.
3, the terminal connection wire, pay attention to the terminal conductive part can’t be pressed to the wire insulation layer,
so as to avoid poor contact, causing abnormalities.
(For more details, please see the "Frequently Asked Questions and Solutions (FAQ)" section)
Figure 2-3 Connecting a signal generator tool (can be a sensor and multimeter)

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2.2.4 Step 4: Power on the product and observe the status of the indicator lights
(1) Plug the two 12V/1A adapters into the power strip (mains AC220V), and the entire system is powered on.
(2) Observe the status of the indicator light, the input current of the transmitter and the output current of the receiver, as
shown in Figure 2-4.
1. The RUN light flashes once every 0.5 seconds, indicating that the product is successfully powered on;
NET light of the supporting product is on, it means that the wireless communication between the two modules is
successful;
3. The AI light is on, indicating that the acquisition signal is successful; the AO light is on, indicating that the output
signal is successful;
4. After confirming that the above is successful, observe whether the signal values of the acquisition end and the restore
end are the same (the error is within the product parameter range). If it is the same, it is successful; if it is not the same,
you need to check the cause of the exception and handle it according to the precautions in the above steps.
Figure 2-4 Observe the current value of the analog input and output modules
(3) Notes:
1. For more details on the functions of the indicator lights, see the chapter " Indicator Description ";
2. If the NET indicator does not light up, it means that the wireless communication is unsuccessful. It is necessary to
check whether the antennas of the product are installed correctly, ensure that the distance between the antennas is 1 meter
or more, and there is no obstruction between the antennas of the product.