GE B90 Instruction Manual page 230

PRODUCT SETUP
5.3.6.2 Serial ports
SETTINGS  PRODUCT SETUP  COMMUNICATIONS  SERIAL PORTS
 SERIAL PORTS

The front RS232 port applies to enhanced and standard front panels.
,
RS232 BAUD RATE RS485 COM2 BAUD RATE
ports. The front panel RS232 port (USB port with graphical front panel) is intended for local use. The rear COM2 port is
RS485 and has settings for baud rate and parity. It is important that these parameters agree with the settings used on the
computer or other equipment that is connected to these ports. Any of these ports can be connected to a computer
running the EnerVista software, for example to download and upload setting files, view measured parameters, and
upgrade the relay firmware. A maximum of 32 relays can be daisy-chained and connected to a DCS, PLC, or computer
5
using the RS485 ports. If IEC 60870-103 is chosen as the protocol, valid baud rates are 9600 and 19200 bit/s, and valid
parity is Even.
RS485 COM2 RESPONSE MIN TIME
receiving data from a host. This feature allows operation with hosts that hold the RS485 transmitter active for some time
after each transmission.
5.3.6.3 Ethernet network topology
The B90 has three Ethernet ports. Each Ethernet port must belong to a different network or subnetwork. Configure the IP
address and subnet to ensure that each port meets this requirement. Two subnets are different when the bitwise AND
operation performed between their respective IP address and mask produces a different result. Communication becomes
unpredictable when more than one port is configured to the same subnet.
Example 1
IP1/Mask1: 10.1.1.2/255.255.255.0 (where LAN 1 is 10.1.1.x/255.255.255.0)
IP2/Mask2: 10.2.1.2/255.255.255.0 (where LAN2 is 10.2.1.x/255.255.255.0)
IP3/Mask3: 10.3.1.2/255.255.255.0 (where LAN3 is 10.3.1.x/255.255.255.0)
Example 2
IP1/Mask1: 10.1.1.2/255.0.0.0 (where LAN1 is 10.x.x.x/255.0.0.0)
IP2/Mask2: 11.1.1.2/255.0.0.0 (where LAN2 is 11.x.x.x/255.0.0.0)
IP3/Mask3: 12.1.1.2/255.0.0.0 (where LAN3 is 12.x.x.x/255.0.0.0)
Example 3 — Incorrect
IP1/Mask1: 10.1.1.2/255.0.0.0
IP2/Mask2: 10.2.1.2/255.0.0.0
IP3/Mask3: 10.3.1.2/255.0.0.0
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 IEC103

 PROTOCOL
 USB 2.0 PORT


RS232 BAUD

RATE: 115200
RS485 COM2 BAUD

RATE: 19200
RS485 COM2 PARITY:

Even
RS485 COM2 RESPONSE

MIN TIME: 0 ms
, and — The B90 is equipped with two independent serial communication
PARITY
— This setting specifies the minimum time before the rear RS485 port transmits after
B90 LOW IMPEDANCE BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
See page 5-94
See page 5-99
Range: 19200, 115200
Range: 300, 1200, 2400, 4800, 9600, 14400, 19200,
28800, 33600, 38400, 57600, 115200 bit/s
Range: None, Odd, Even
Range: 0 to 1000 ms in steps of 10