SST Automation GT200-PN-RS User manual

Universal Serial/PROFINET IO Gateway
GT200-PN-RS
User Manual
V 1.0
REV A
SST Automation
E-mail: [e-mail]
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Catalog
1 Product Overview.............................................................................................................................................................4
1.1 Product Function................................................................................................................................................... 4
1.2 Product Features....................................................................................................................................................4
1.3 Technical Specification......................................................................................................................................... 4
1.4 Related Products....................................................................................................................................................6
1.5 Revision History....................................................................................................................................................6
2 Hardware Descriptions.....................................................................................................................................................7
2.1 Product Appearance...............................................................................................................................................7
2.2Indicators................................................................................................................................................................ 7
2.3 Interface.................................................................................................................................................................8
2.3.1 Power Interface.......................................................................................................................................... 8
2.3.2 Serial I-RS232............................................................................................................................................8
2.3.3 Serial II-RS485...........................................................................................................................................9
2.3.4 Standard RS485 Characteristics.................................................................................................................9
2.3.5 Ethernet Interface..................................................................................................................................... 10
3 Quick Start Guide...........................................................................................................................................................11
3.1 Gateway Configuration....................................................................................................................................... 11
3.2 Software Instructions...........................................................................................................................................11
3.3 Run...................................................................................................................................................................... 13
3.3.1 Data Exchange......................................................................................................................................... 13
3.3.2 Self-defined Protocol............................................................................................................................... 18
3.3.3 User Config.............................................................................................................................................. 20
3.4 Change Device IP and Name.............................................................................................................................. 25
3.4.1 Scan Devices on LAN..............................................................................................................................25
3.4.2 Change IP Info and Name........................................................................................................................26
3.5 IP Address Conflict Resolution...........................................................................................................................29
3.6 Restore to Default Configuration........................................................................................................................31
4 Software Instructions......................................................................................................................................................32
4.1 User Interface...................................................................................................................................................... 32
4.2 Device View Operation....................................................................................................................................... 34
4.2.1 Device View Interface..............................................................................................................................34
4.2.2 Operation Mode....................................................................................................................................... 34
4.2.3 Operation Types....................................................................................................................................... 35
4.3 Configuration View Operation............................................................................................................................36
4.3.1 Subnet Configuration Interface................................................................................................................36
4.3.2 Node Configuration..................................................................................................................................44
4.3.3 Command Configuration..........................................................................................................................44
4.3.4 Comment Interface...................................................................................................................................46
4.4 Conflict Detection............................................................................................................................................... 47
4.4.1 Command List Operation.........................................................................................................................47
4.4.2 Memory Mapping Area Operation...........................................................................................................48
4.5 Hardware Communication.................................................................................................................................. 48
4.5.1 Ethernet Configuration.............................................................................................................................49
4.5.2 Upload...................................................................................................................................................... 49
4.5.3 Download................................................................................................................................................. 50
4.6 Load and Save Configuration............................................................................................................................. 51
4.6.1 Load Configuration Project......................................................................................................................51

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4.6.2 Save Configuration Project...................................................................................................................... 51
4.7 Export EXCEL.................................................................................................................................................... 51
5 Installation...................................................................................................................................................................... 52
51 Machine Dimension............................................................................................................................................. 52
5.2 Installation Method............................................................................................................................................. 52

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1 Product Overview
1.1 Product Function
GT200-PN-RS is a gateway which can provide a seamless connection between PROFINET network and Modbus.
It can connect 2 devices with RS-232 or devices with RS485 interface to PROFINET network.
1.2 Product Features
Wide application: Any devices with RS-232/RS485 interface can use this gateway to realize exchanging data. For
example, Such as frequency converters with Modbus protocol interface, motor startup protection devices,
intelligent high and low voltage electrical appliances, power measuring devices, transmitters, intelligent field
measuring equipment and instruments etc.
Easy configuration: Users don't need to know the technical details of Modbus, but refer to this manual and the
application cases provided, complete configuration according to the gateway configuration software
SST-TS-CFG without complex programming and implement the communication in a short time.
1.3 Technical Specification
[1] At PROFINET side GT200-PN-RS is PROFINET slave and acts as Modbus master or Modbus slave at serial side;
[2] Supports standard PROFINET I/O protocol;
[3] PROFINET: supports up to 32 slots, input/output data buffer is up to 384 bytes (the length uses can use is limited
to specific PLC and PDU size of communication module), the length of input/output bytes can be set by the host
computer software such as STEP7 or TIA Portal.;
[4] Supports the following module types:
Input 001 byte
Input 002 bytes
Input 004 bytes
Input 008 bytes
Input 016 bytes
Input 032 bytes
Input 064 bytes
Input 128 bytes

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Output 001 byte
Output 002 bytes
Output 004 bytes
Output 008 bytes
Output 016 bytes
Output 032 bytes
Output 064 bytes
Output 128 bytes
Input / Output 001 byte
Input / Output 002 bytes
Input / Output 004 bytes
Input / Output 008bytes
Input / Output 016 bytes
Input / Output 032 bytes
Input / Output 064 bytes
Input / Output 128 bytes
[5] With 2 serial ports, serial I support RS-232,serial II support RS485,Two serial ports can be used as
communication ports, and they can communicate at the same time.
[6] The protocol type serial ports support: Modbus master, Modbus slave, self-defined protocol, User Config;
[7] Serial port parameters:
Operation mode: Half-duplex;
Baud rate: 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600 and 115200 bps optional;
Data bits:7, 8;
Parity: None, Odd, Even, Mark and space optional;
Stop bits: 1,2 optional;
[8] Modbus master:
Function code: 01H, 02H, 03H, 04H, 05H, 06H, 0FH and 10H;
Format: RTU and ASCII;
Function: Cycle output, forbidden output and change of value output of write command;
Each master can configure up to 48 Modbus commands;
When serial port 1 (RS232 serial port) and serial port 2 (RS485 serial port) simultaneously connect the slave
equipment as the Modbus master, Serial port 1 supports connection of 1 Modbus slave device, and serial
port 2 can configure up to 3 nodes. When configuring serial port 2 as the Modbus master independently, it

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can configure up to 4 nodes.
[9] Modbus slave:
Function code: 03H, 04H, 06H and 10H;
Format: RTU and ASCII
[10] Power supply: 24VDC (11V~30V);
[11] Operation temp: -4℉~140℉(-20℃~60℃), Humidity: 5%~ 95% (non-condensing);
[12] Built-in electrostatic protection: 15 KV ESD; Communication interface isolation: 3KV;
[13] External dimensions (W*H*D): 1.57 in*4.92 in *4.33 in (40mm*125mm*110mm);
[14] Protection level: IP20.
1.4 Related Products
The related products include:
GT200-DN-RS: Modbus/DeviceNet Gateway
GT200-DP-RS: Universal Serial/PROFIBUS DP Gateway
If you want to get more information about related products, please visit SSTCOMM website:
http://www.sstcomm.com.
1.5 Revision History
Revision
Date
Chapter
Description
REV A
22/2/2018
All
New release

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2 Hardware Descriptions
2.1 Product Appearance
Note: This picture is for reference only. Product appearance should refer to the real object.
2.2Indicators
Indicators
State
Description
SerialⅠTX
Green Blinking
Serial port data sending
OFF
No data is sending
SerialⅠRX
Green Blinking
Serial port data receiving
OFF
No data is receiving
SerialⅡTX
Green Blinking
Serial port data sending
OFF
No data is sending
Serial I RX Indicator
SerialⅠTX Indicator
SerialⅡRX Indicator
SerialⅡTX Indicator
Network Indicator
Module Indicator
Dual PROFINET
Ports
SubnetⅠ
Subnet Ⅱ
24VDC Interface
DIP Switch

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SerialⅡRX
Green Blinking
Serial port data receiving
OFF
No data is receiving
MS
See below table
NS
See below table
Module indicator and network indicator:
Module indicator state MS
Network indicator state NS
Description
OFF
Red blinking
Start-up state, waiting to initialize
Green on
Red blinking
Initialize complete, no connection with
PLC
Green on
Green on
PLC has connected
Other
Other
Undefined state
2.3 Interface
2.3.1 Power Interface
Pin
Function
1
Power GND
2
NC, Not connected
3
24V+, DC Positive 24V, range 9~30V
2.3.2 Serial I-RS232
GND
NC
24V+
TXD
RXD
GND

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Pin
Function
1
TXD, RS-232 data sending, Connect RXD of user device
2
RXD, RS-232 data receiving, Connect TXD of user device
3
GND
2.3.3 Serial II-RS485
Pin
Function
1
D+, RS485 Data Positive, connect Data Positive of user device
2
D-, RS485 Data Negative, connect Data Negative of user device
3
GND
2.3.4 Standard RS485 Characteristics
The basic characteristics of RS485 transmission technology:
Network topology: Linear bus, there are active bus terminal resistors at both sides.
Transmission rate: 1200 bps~115.2Kbps.
Media: Shielded twisted-pair cable and also can cancel the shielding, depending on environmental
conditions (EMC).
Site number: 32 stations per subsection (without repeater), and can increase up to 127 stations (with
repeater). When serial port 1 and serial port 2 simultaneously connect the slave equipment as the Modbus
master or User config, serial port 2 can configure up to 3 nodes. When configuring serial port 2 as the
Modbus master independently, it can configure up to 4 nodes.
Plug connection: 5-pin pluggable terminal.
The main points on the installation of RS485 transmission equipment:
All the equipment are connected with RS485 bus;
The farthest two end of the bus has a terminal resistor—120Ω 1/2W to ensure reliable operation of the
network.
Serial interface uses 5-pin pluggable open terminal and user can wire it according to the wiring instructions
D+
D-
GND

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on the panel.
2.3.5 Ethernet Interface
Ethernet interface uses RJ-45 plug-in; its pin (standard Ethernet signal) is defined as below:
Pin
Signal Description
S1
TXD+, Tranceive Data+, Output
S2
TXD-, Tranceive Data-, Output
S3
RXD+, Receive Data+, Input
S4
Bi-directional Data+
S5
Bi-directional Data-
S6
RXD-, Receive Data-
S7
Bi-directional Data+
S8
Bi-directional Data-

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3 Quick Start Guide
3.1 Gateway Configuration
Configuring GT200-PN-RS needs the following steps:
a) Connect the power properly connect,GT200-PN-RS and PC through Ethernet cable and power on the
gateway;
b) Configure in the SST-TS-CFG according to users requirements;
c) Click "Download " button on the toolbar to download the configuration to the gateway;
d) When downloading is complete, it will give hints "whether to restart the gateway ", click "Yes ";
e) Configure some relevant modeling in STEP7, including module, IP address of target device and device
name;
f) Download the STEP7 modeling configuration to the PLC;
g) Waiting for about 10s, GT200-PN-RS will establish PROFINET connection with the PLC. At this time,
NS green on, MS green on.
Notes: How to find out how many GT200-PN-RS devices are in the LAN, including MAC address, IP address
and name of devices. Users can see chapter 3.4 Change Device IP and Name for help.
There are 3 necessary conditions which need to happen simultaneously when PROFINET device of SSTCOMM
is communicating with PLC:
a) The PROFINET device name must be the same as that of device in PLC modeling.
b) The PROFINET device IP address must be the same as that of device in PLC modeling.
c) The configuring module of PROFINET device (configuring through SST-TS-CFG) must be the same as that
in PLC modeling.
Note: The device name of GT200-PN-RS,which supports only a combination of lowercase letters and numbers, and
must begin with a lowercase letter.
The following are legal names: dut28 dut28nn32
The following are illegal names: 28dut、dut28$、dut28+uu
3.2 Software Instructions
Users need to install the gateway software SST-TS-CFG when configuring the gateway.
Users can use SST-TS-CFG to finish configuring GT200-PN-RS easily, including IP address, subnet mask,
gateway address, device name, baud rate of serial port, parity, stop bits, communication protocol selection and

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protocol parameters. Also, users can choose to conduct the conflict detection to memory mapping data of the gateway.
After installation, double click the software icon to enter into the main interface of the software:
See chapter 4 for the detailed using method of the gateway configuration software SST-TS-CFG.

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3.3 Run
3.3.1 Data Exchange
The data conversion between PROFINET network and serial of GT200-PN-RS is established by "mapping".
GT200-PN-RS has two data buffers, one is input buffer (1K bytes) with address range 0x0000-0x03FF; the other is
output buffer (1K bytes) with address range 0x4000-0x43FF.
3.3.1.1 PROFINET Slave
Presuming the input data length users have configured is N1, output data length is N2. GT200-PN-RS will
periodically send the data within the address range of [0x0000, N1] to PROFINET network; When receiving data
from PROFINET network, GT200-PN-RS will write the data to the address range of [0x4000, 0x4000+N2].
3.3.1.2 Modbus Master
When one serial runs Modbus master protocol, for all write registers, write coils command GT200-PN-RS
supports, GT200-PN-RS can get data from address range 0x0000-0x03FF, 0x4000-0x43FF and send them to the
Modbus slave. For all read registers, read coils command, GT200-PN-RS can write the data returned from Modbus
slave to address range 0x0000-0x03FF.
Notes: Each Modbus master can configure 48 commands, and every command can get one continuous Modbus
register.
3.3.1.3 Modbus Slave
When one serial runs Modbus slave protocol, for No. 03 commands master sent, GT200-PN-RS will get data
from address range 0x0000-0x03FF. For No. 04 commands, it will get data from 0x4000-0x43FF and return them to
the Modbus master. For No. 06, 16 command, it will write the Modbus master data to the address range of
0x0000-0x03FF.
3.3.1.4 Self-defined Protocol
When one serial runs self-defined protocol, users' serial device can read/write data to any address of two buffers
of 0x0000-0x03FF and 0x4000-0x43FF.
3.3.1.5 User Config-Poll
When one serial runs universal mode-ask and answer, request part of command can get data from any address of

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buffer 0x0000-0x03FF and 0x4000-0x43FF and send data to the serial slave device. When serial slave devices didn't
give any response (if they did), if there exists data in response, GT200-PN-RS will write them to the address range of
0x0000-0x03FF. The specific data size will depend on users' configuration.
3.3.1.6 User Config-Receiving Only
When one serial runs universal mode-receive, it will receive data sent from serial master device and don't give
any response. In this way, GT200-PN-RS will write the data which it received to some address areas of
0x0000-0x03FF.
3.3.1.7 Command Output Mode
Note: the content of this section is only applicable to MODBUS master protocol and User Config-POLL
protocol.
Write command: The request frame contains commands for memory mapping area data of GT200-PN-RS.For
example, the 5, 6, 15 and 16 function codes of MODBUS master protocol are written commands. The command with
"data" field in the request frame of User Config-POLL is written command.
Read command: The command that is not written is read.
Command execution process:
1. The number of timeout retransmission is set to 0.
2. Request frame for sending commands. After sending, the response timeout timer begins.
3. Wait for the command response frame.
4. If a response frame is received within the response timeout period, a response is considered. Whether the
response is correct depends on the specific response frame format. If the response frame is correct, the
execution of the command ends, If a response frame is not received within the response timeout period, the
response timeout is considered. Response error and response timeout, enter 5.
5. Determine whether the number of retransmission is 3.If 3, the execution of the command ends. Otherwise,
the timeout retransmission times add 1,enter 2.
Cycle output mode
In the Master protocol, each command has a unique command index in each subnet.
The Master protocol works in Cycle output mode and is executed as follows:
1. Execute the command N.
2. Wait for "command delay time", N plus 1. If N is greater than the number of command, N is 0. Execute order
N.
Change of Value output mode

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The Master protocol works in Change of Value output mode and is executed as follows:
1. If command N is read, execute command N. Otherwise, check whether the memory mapping data contained in
the request frame of command N is changed. If there is a change, execute the command N.
2. Wait for "command delay time", N plus 1. If N is greater than the number of command, N is 0. Execute order
N.
Quick output mode
Note: Quick output is valid only if "Output Command Polling Mode" in the subnet is "Change of Value" and only
for write commands.
When the system is initialized, if a Quick output command is found under the subnet, all commands under the
subnet will be divided into two queues. Queue 1 is a Quick output command queue, and queue 2 is an normal
command queue.
The Master protocol works in Quick output mode and is executed as follows:
1. Check the commands in the “Quick Output Command” queue one by one, and execute the command if the
data of a command changes. Until the data of all commands in the queue did not change.
2. Execute a command in the normal queue. An execution index in a normal queue plus one. If the number of
commands in a normal queue is exceeded, the index value is 0. Enter 1.
As you can see from the above execution, Quick output is preferred to write commands, which is of great benefit
to the transmission of control information as soon as possible at some low baud rates (<= 19200), but this
advantage is small for high baud rates.
3.3.1.8 Byte-swap
There are four types: no swap, double-byte swap, four-byte register swap and Four-Byte Big-endian and
Little-endian Swap.
double-byte swap
When using double-byte swap, the number of bytes exchanged must be 2 times integer.
Double-byte swap is 2 bytes for unit exchange, and the exchange mode is shown in the following table:
Before exchange
After exchange
Byte index
Byte value
Byte index
Byte value
0
0x12
0
0x34
1
0x34
1
0x12
four-byte register swap
When using four-byte register swap, the number of bytes exchanged must be 4 times integer.

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Four-byte register swap is 2 registers for unit exchange, and the exchange mode is shown in the following table:
Before exchange
After exchange
Byte index
Byte value
Byte index
Byte value
0
0x12
0
0x56
1
0x34
1
0x78
2
0x56
2
0x12
3
0x78
3
0x34
Four-Byte Big-endian and Little-endian Swap
When using Four-Byte Big-endian and Little-endian Swap, the number of bytes exchanged must be 4 times
integer.
Four-Byte Big-endian and Little-endian Swap is 4 bytes for unit exchange, and the exchange mode is shown in
the following table:
Before exchange
After exchange
Byte index
Byte value
Byte index
Byte value
0
0x12
0
0x78
1
0x34
1
0x56
2
0x56
2
0x34
3
0x78
3
0x12
3.3.1.9 Bytes Exchange Way in Various Protocols
The schematic diagram is as follows:
As you can see from the figure, the byte-exchange program is only a process between the buffer and the request
or response frame of the command, without changing the length of the total data, only changes the organization
way of the data.
Command execution mode:
1. Read a certain length of data from the buffer (input or output) and put it in the frame buffer of the command.
Then, send the command.
2. When the command has a response, the data is separated from the response frame of the command and copied

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to the buffer
After adding byte swap processing:
1. Read a certain length of data from the buffer (input or output), byte swap processing, then put it in the frame
buffer of the command, and finally send the command
2. When the command has a response, the data is separated from the response frame of the command ,byte swap
processing, then copied to the buffer
Note: When the byte swapping process is performed, the data to be processed is divided according to a specific
length. For example, when 2 bytes are exchanged, data is processed in units of 2 bytes. When 4 bytes are
exchanged, data is processed in units of 4 bytes.
3.3.1.10 IO Status Word
In order to easily obtain the state of the execution of each command under each master station, the IO state word
is introduced
MODBUS master protocol and User Config-POLL protocol
Both of these protocols are the master protocol and are also based on command. We use a bit to indicate whether
the execution of each command is successful or not. When the command execution is successful, the corresponding
bit is set to 1, otherwise it is set to 0.When a subnet is configured as a master protocol, the number of bytes occupied
by the IO status word of the subnet is calculated using the following formula:
The number of bytes in IO status word = ((integer, Discard decimal part) (command bar number under subnet +
15) / 16) * 2
For example:
MODBUS master station protocol is configured in subnet 1, with a total of 15 commands, according to the
calculation formula above:
(15 + 15) / 16 = 1, 1*2 = 2 (bytes)
So the IO status of these 15 commands takes up 2 bytes. The specific IO status indication information is as
follows:
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Byte 0
Command
7 indicate
bit
Command
6 indicate
bit
Command
5 indicate
bit
Command
4 indicate
bit
Command
3 indicate
bit
Command
2 indicate
bit
Command
1 indicate
bit
Command
0 indicate
bit
Byte 1
Command
14 indicate
bit
Command
13 indicate
bit
Command
12 indicate
bit
Command
11 indicate
bit
Command
10 indicate
bit
Command
9 indicate
bit
Command
8 indicate
bit

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MODBUS slave protocol and Self-defined protocol
The two protocols are slave protocols. Their IO status word is used to indicate the running state of the protocol
by a 16-bit integer change. Every time a correct request frame is received from the slave. The value is
automatically added 1.
The 16-bit integer is represented in a Little-endian, where the low address represents the low byte of the 16-bit
integer and the high address represents the high byte of the 16-bit integer
3.3.1.11 Response Timeout Handling for Master Protocol
The specific application scene is like this: After the master sends the request frame, it will wait for the response
of the slave device within the limited time. If the slave does not respond within a limited time, the master
protocol will trigger the response timeout processing. How to deal with this?
If the command is successfully executed the previous time, it will be reissued three times (a total of four times),
In the process of retransmission, if any response is given from the slave, it will stop repeating and transferred to
the next command. If the slave still has no response after three retransmission, the processing method given in
the response timeout handling option is executed. Namely: Clear or Hold. It should be noted that the clear or hold
here is for the data part of the slave response frame. Because GT200-PN-RS transformation between protocols is
achieved by mapping, so the data part of each command's response frame will have a mapping area in the input
buffer of GT200-PN-RS.Our "clear or hold" is for this mapped data area. Specifically, if "clear" is selected, all
data in the map area will be set to 0 after the response timeout; if " hold", the content of the map data area will
not be changed after the response timeout.
If the command is unsuccessfully executed the previous time, re-transmission is not executed.
3.3.2 Self-defined Protocol
3.3.2.1 Definition
User device acts as initiator, send output data in the request frame.
GT200-PN-RS acts as responder which sends input data in the response frame.
Communication way is point to point.
Time interval between bytes in request frame should be less than 50ms, or GT200-PN-RS will dispose this frame
data.
For every valid request frame, GT200-PN-RS should make response in 200ms.
Supports communication baud rate range 300~115200 bps, 8 data bits, parity (None, Odd, Even, Mark, Space)

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and 1 or 2 stop bits.
3.3.2.2 Communication Message Format
3.3.2.2.1 Request Frame Message
[Output data length] [High byte of output data start address] [Low byte of output data start address] [Input data
length] [High byte of input data start address] [Low byte of input data start address] [Output data 1]…… [Output data
n] [Parity]
Notes: Output means the data that users device writes to GT200-PN-RS, input means the data that users device
gets from GT200-PN-RS.
Data number n equals output data length.
Output data address range: 0x0000-0x03FF, 0x4000-0x43FF;
Input data address range: 0x0000-0x03FF, 0x4000-0x43FF;
3.3.2.2.2 Response Frame Message
Correct response:
[Input data length] [High byte of input data start address] [Low byte of input data start address] [Input data
1]…… [Input data n] [Parity]
Data number n equals input data length.
Wrong response:
[0x00] [0xFF] [0xFF] [error code] [parity]
3.3.2.3 Parity
Accumulated sum of 8 bits of all data, ignore the flow bit. That is:
[Message parity code] = [output data length] + [high byte of output data start address] + [low byte of output data
start address] + [input data length] + [high byte of input data start address] + [low byte of input data start address] +
[output data 1] +……+ [output data n].
[Response parity code] = [input data length] + [high byte of input data start address] + [low byte of input data
start address] + [output data 1] +……+ [output data n].
3.3.2.4 Error Code
Error Code
Meaning
0x01
Output data length error
0x02
Accumulated sum parity error

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0x03
Output data start address error or illegal output data area
0x04
Input data start address error or illegal input data area
3.3.2.5 Message Examples
If input data number is 50 bytes, output data is 32 bytes.
Now, users want to output all zero data and get all input data, examples are as below:
[The following data format is all HEX]
Request frame message:
[20] [40 00] [32] [00 00] [00……00] [92]
|output data length| output start address| input data length | input start address| 32 output data| parity (accumulated sum)
|
Response frame message:
[32] [00 00] [00……00] [92]
|input data length| input start address| 50 output data| parity (accumulated sum) |
Here the output and input address is memory mapping address of GT200-PN-RS.
3.3.3 User Config
3.3.3.1 Definition
Common mode protocol message of GT200-PN-RS can be set freely by users, which solves the communication
problem between Modbus standard protocol and Modbus nonstandard protocol devices. There are two operation
modes under common mode: POLL and READ. Working principle of POLL is similar with Modbus communication
protocol, which uses request and response communication way and every subnet can set 30 commands under common
mode; READ only receives stored data and doesn't respond after receiving data, such as bar code scanner and device
communication etc.
3.3.3.2 User Config-POLL
Users need to configure request message and response message of User Config-POLL before using it.
Frame header: HEX input, max bytes number: 8
Data: HEX input, every item occupies two bytes
Constant: HEX input, max bytes number: 8
Parity: None, CRC check, LRC check, Sum check