Moxa EDR-810-VPN-2GSFP [116/139] Industrial secure router user s manual firewall

Moxa EDR-810-VPN-2GSFP [116/139] Industrial secure router user s manual firewall
Industrial Secure Router User's Manual Firewall
8-12
Destination IP
Setting Description Factory Default
All (IP Address) This Modbus policy will check all Destination IP addresses in the
packet.
All
Single (IP Address) This Modbus policy will check single Destination IP addresses in
the packet.
Range (IP Address) This Modbus policy will check multiple Destination IP addresses
in the packet.
Unit identifier (UID) is used with Modbus/TCP devices that are composites of several Modbus devices. It may
be used to communicate via devices such as bridges and gateways which use a single IP address to support
multiple independent end units.
Function code defines the message type and the type of action required by the slave. The parameter contains
one byte of information. Valid function codes are in the range 1 to 255. Not all Modbus devices recognize the
same set of function codes. The most common codes are supported for quick settings, and user-defined
function codes are also supported.
Most function code addresses a single address or a range of addresses. The Industrial Secure Router provides
code for deep data inspection.
Common function codes
The following table shows the various reading, writing, and other operations.
Function Name Function Code
Data Access
Bit Access
Physical Discrete Inputs Read Discrete Inputs 2
Internal Bits or Physical
Coils
Read Coils 1
Write Single Coil 5
Write Multiple Coils 15
16-bit Access
Physical Input Registers Read Input Register 4
Internal Registers or
Physical Output Registers
Read Holding Registers 3
Write Single Register 6
Write Multiple Registers
16
Read/Write Multiple
Registers
23
Mask Write Register 22
Read FIFO Queue 24
File Record Access
Read File Record 20
Write File Record 21
Diagnostics
Read Exception Status 7
Diagnostic 8
Get Com Event Counter
11
Get Com Event Log 12
Report Slave ID 17
Read Device
Identification
43

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