GE C30 Instruction Manual page 189

CHAPTER 5: SETTINGS
The tables outline the information displayed when the two submenus are selected.
Table 5-7: Routing table information
Field Description
Destination The IP address of the remote network to which this route points
Mask The network mask for the destination
Gateway The IP address of the next router to the remote network
Interface Interface through which the specified network can be reached
Table 5-8: IP ARP information
Field Description
IP Address The network address that corresponds to Hardware Address
Age (min) Age, in minutes, of the cache entry. A hyphen (-) means the address is local.
Hardware Address LAN hardware address, a MAC address that corresponds to network address
Type Dynamic or Static
Interface Interface to which this address mapping has been assigned
5.3.4.8 Modbus protocol
SETTINGS  PRODUCT SETUP  COMMUNICATIONS  MODBUS PROTOCOL
 MODBUS PROTOCOL

The serial communication ports utilize the Modbus protocol, unless the port is configured for DNP or IEC 60870-5-103
operation. This allows the EnerVista UR Setup software to be used on the port. UR devices operate as Modbus slave
devices only.
For more information on the protocol, including the memory map table, see the UR Family Communications Guide.
— When using the Modbus protocol on the RS232 port, the C30 responds regardless of the
MODBUS SLAVE ADDRESS
programmed. For the RS485 port, each device on the serial bus must have a unique slave address
MODBUS SLAVE ADDRESS
from 1 to 254. Address 0 and addresses from 248 and up are reserved by the Modbus protocol specification, and so their
use here is not recommended. Address 0 is the broadcast address to which all Modbus slave devices listen. Addresses do
not have to be sequential, but no two devices can have the same address or conflicts resulting in errors occur. Generally,
starting at 1, set each device added to the link to use the next higher address. When using Modbus TCP/IP, the client must
use the programmed
MODBUS SLAVE ADDRESS
— Modbus over TCP/IP can also be used on any of the Ethernet ports. The listening TCP port 502
MODBUS TCP PORT NUMBER
is reserved for Modbus communications, and only in exceptional cases when
port. The
MODBUS TCP PORT NUMBER
0 disables Modbus over TCP/IP, meaning closes the Modbus TCP port. When the port number is changed to 0, the change
takes effect when the C30 is restarted. When it is set to 0, use the front panel or serial port to communicate with the relay.
Do not set more than one protocol to the same TCP/UDP port number, as this results in unreliable operation of
those protocols.
5.3.4.9 Protocol selection
SETTINGS  PRODUCT SETUP  COMMUNICATIONS  PROTOCOL
 PROTOCOL

C30 CONTROLLER SYSTEM – INSTRUCTION MANUAL
MODBUS SLAVE

ADDRESS: 254
MODBUS TCP PORT

NUMBER(502): 502
value in the Unit Identifier field.
setting sets the TCP port used by Modbus on Ethernet. A
SCADA PROTOCOL:

DNP 3.0
Range: 1 to 254 in steps of 1
Range: 0 to 65535 in steps of 1
MODBUS TCP PORT NUMBER
MODBUS TCP PORT NUMBER
Range: DNP 3.0, IEC 60870-5-104, IEC 60870-5-103
PRODUCT SETUP
5
is set to any other
of
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