Date Code 20210715 SEL-2890 Instruction Manual
Settings and Commands
Settings
3.9
Routing IP Address n
This setting is only available if ACCEPTn = N. In this mode, the transceiver will
initiate a connection or tunnel across a network to another Ethernet device. The routing
IP address is the destination for the serial data the SEL-2890 received and forwarded
when it was identical to the descriptive header. After a successful connection, the
message will be sent.
Descriptive Header n
The descriptive header is the ASCII-hexadecimal mask that will determine if a serial
message should be routed. If the first bytes (as many as 8) of the serial message
received by the SEL-2890 serial port match the descriptive header, then the serial
message is routed to the IP designated by ROUTE_IPn.
Serial routing settings previously described apply to n = 1, 2, or 3.
Data Rate
The data rate is the number of bit transitions per second and represents the effective
data rate on EIA-232 connections that do not use data compression. Set the data rate to
match the serial data transmission speed of the IED that will communicate with the
SEL-2890. Available serial port data rates are 300, 600, 1200, 2400, 4800, 9600,
19200, 38400, 57600, or 115200. The default data rate is 19200 bps (for firmware
versions R101–R103, the default speed is 38400).
Parity
Parity refers to summing all the information bits in a serial packet and then adding a
parity bit of 1 or 0 to the sum. The parity bit will make the total number always equal to
an even or odd number. This is used for error checking. The transceiver will ignore
parity if the setting is “None.” Set the parity to match the serial IED that will
communicate with the transceiver.
Stop Bits
EIA-232 serial data transmission is asynchronous. Asynchronous data transmission has
time intervals between characters that may be of unequal length. Therefore, start and
stop bits are needed to determine when the packet of data starts and stops. Set the stop
bits to match the serial IED that will be communicating with the transceiver. Stop bits
are forced to 1 if parity is odd or even.
Flow Control
Flow control is used to prevent data from being transmitted faster than a receiving
device can receive the data. Software flow control uses ASCII XON and XOFF
characters to tell the sending IED to stop transmitting data while the receiving IED
To Next Page
Loading...
