GE Multilin 489 Instruction Manual page 122
Generator management relay
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Also See for Multilin 489:
- Instruction manual (306 pages) ,
- Communications manual (78 pages) ,
- Instruction manual (38 pages)
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5.2.3
Communications
SERIAL PORTS
5–12
Courtesy of NationalSwitchgear.com
Serial Communications
The following setpoints appear when the relay is ordered with the regular enhanced (E)
option.
PATH: SETPOINTS
S1 489 SETUP
[ ]
SLAVE ADDRESS:
254
COMPUTER RS485
MESSAGE
BAUD RATE: 9600
COMPUTER RS485
MESSAGE
PARITY: None
AUXILIARY RS485
MESSAGE
BAUD RATE: 9600
AUXILIARY RS485
MESSAGE
PARITY: None
The 489 is equipped with 3 independent serial communications ports supporting a subset
of Modbus RTU protocol. The front panel RS232 has a fixed baud rate of 9600 and a fixed
data frame of 1 start/8 data/1stop/no parity. The front port is intended for local use only
and will respond regardless of the slave address programmed. The front panel RS232
program port may be connected to a personal computer running the EnerVista 489 Setup
software. This program may be used for downloading and uploading setpoint files, viewing
measured parameters, and upgrading the 489 firmware to the latest revision.
For RS485 communications, each relay must have a unique address from 1 to 254. Address
0 is the broadcast address monitored by all relays. Addresses do not have to be sequential
but no two units can have the same address or errors will occur. Generally, each unit
added to the link will use the next higher address starting at 1. Baud rates can be selected
as 300, 1200, 2400, 4800, 9600, or 19200. The data frame is fixed at 1 start, 8 data, and 1
stop bits, while parity is optional. The computer RS485 port is a general purpose port for
connection to a DCS, PLC, or PC. The Auxiliary RS485 port may also be used as another
general purpose port or it may be used to talk to Auxiliary GE Multilin devices in the future.
COMMUNICATIONS
Range: 1 to 254 in steps of 1
Range: 300, 1200, 2400, 4800, 9600,
19200
Range: None, Odd, Even
Range: 300, 1200, 2400, 4800, 9600,
19200
Range: None, Odd, Even
489 GENERATOR MANAGEMENT RELAY – INSTRUCTION MANUAL
CHAPTER 5: SETPOINTS
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