GE C30 Instruction Manual page 138

5.2 PRODUCT SETUP
Do not set more than one protocol to the same TCP/UDP Port Number, as this results in unreliable operation of
those protocols.
NOTE
e) MODBUS PROTOCOL

PATH: SETTINGS PRODUCT SETUP
 MODBUS PROTOCOL

The serial communication ports utilize the Modbus protocol, unless configured for DNP operation (see descriptions below).
This allows the EnerVista UR Setup software to be used. The UR operates as a Modbus slave device only. When using
Modbus protocol on the RS232 port, the C30 responds regardless of the
RS485 port, each C30 must have a unique address from 1 to 254. Address 0 is the broadcast address which all Modbus
slave devices listen to. Addresses do not have to be sequential, but no two devices can have the same address or conflicts
resulting in errors will occur. Generally, each device added to the link should use the next higher address starting at 1. See
Appendix B for more information on the Modbus protocol.
A value of 0 closes the port. When the Modbus port is set to 0, communicate with the relay using the front panel or serial
port.
When a 0 value is involved in a change, the changes to the MODBUS TCP PORT NUMBER setting take effect
when the C30 is restarted.
NOTE
5
f) DNP PROTOCOL

PATH: SETTINGS PRODUCT SETUP
 DNP PROTOCOL

5-22

COMMUNICATIONS
MODBUS SLAVE
ADDRESS: 254
MODBUS TCP PORT
MESSAGE
NUMBER:

COMMUNICATIONS
 DNP CHANNELS

DNP ADDRESS:
MESSAGE
1
 DNP NETWORK
MESSAGE
 CLIENT ADDRESSES
DNP TCP/UDP PORT
MESSAGE
NUMBER: 20000
DNP UNSOL RESPONSE
MESSAGE
FUNCTION: Disabled
DNP UNSOL RESPONSE
MESSAGE
TIMEOUT: 5 s
DNP UNSOL RESPONSE
MESSAGE
MAX RETRIES: 10
DNP UNSOL RESPONSE
MESSAGE
DEST ADDRESS: 1
DNP CURRENT SCALE
MESSAGE
FACTOR: 1
DNP VOLTAGE SCALE
MESSAGE
FACTOR: 1
DNP POWER SCALE
MESSAGE
FACTOR: 1
C30 Controller System

MODBUS PROTOCOL
Range: 0 to 254 in steps of 1
Range: 0 to 65535 in steps of 1
502
MODBUS SLAVE ADDRESS

DNP PROTOCOL
Range: see sub-menu below
Range: 0 to 65519 in steps of 1
Range: see sub-menu below
Range: 0 to 65535 in steps of 1
Range: Enabled, Disabled
Range: 0 to 60 s in steps of 1
Range: 1 to 255 in steps of 1
Range: 0 to 65519 in steps of 1
Range: 0.001, 0.01. 0.1, 1, 10, 100, 1000, 10000,
100000
Range: 0.001, 0.01. 0.1, 1, 10, 100, 1000, 10000,
100000
Range: 0.001, 0.01. 0.1, 1, 10, 100, 1000, 10000,
100000
5 SETTINGS
programmed. For the
GE Multilin