Schweitzer Engineering Laboratories SEL-321 - Appendix H: Mirrored Bits Communications; Overview; Settings

Date Code 20011026 MIRRORED BITS Communications H-1
SEL-321/321-1 Instruction Manual
APPENDIX H: MIRRORED BITS™ COMMUNICATIONS
OVERVIEW
MIRRORED BITS is a direct relay-to-relay digital communications protocol which allows
protective relays to exchange information quickly and securely, and with minimal expense. The
information exchanged can facilitate remote control, remote sensing, or communications-assisted
protection schemes such as POTT, DCB, etc. In this document the bits received are called
RMB1 through RMB8. Bits transmitted are called TMB1 through TMB8.
SETTINGS
protocol (SEL,LMD,MB,MB8) PROTOCOL= MB ?
baud rate (300-38400) SPEED = 9600 ?
enable hardware handshaking (Y,N,MBT) RTS_CTS= N ?
Mirrored Bits Receive bad pickup (1- 10000 sec) RBADPU= 60 ?
Mirrored Bits Channel bad pickup (1- 10000 10E-6) CBADPU= 1000 ?
Mirrored Bits transmit identifier(1 - 4) TX_ID = 1 ?
Mirrored Bits receive identifier(1 - 4) RX_ID = 2 ?
Mirrored Bits receive default state (string of 1s, 0s or Xs)
87654321
RXDFLT=00000X11
?
Mirrored Bits RMB_ Debounce PU time (1-8 msgs) RMB1PU= 1 ?
Mirrored Bits RMB_ Debounce DO time (1-8 msgs) RMB1DO= 1 ?
Mirrored Bits RMB_ Debounce PU time (1-8 msgs) RMB2PU= 1 ?
Mirrored Bits RMB_ Debounce DO time (1-8 msgs) RMB2DO= 1 ?
Mirrored Bits RMB_ Debounce PU time (1-8 msgs) RMB3PU= 1 ?
Mirrored Bits RMB_ Debounce DO time (1-8 msgs) RMB3DO= 1 ?
Mirrored Bits RMB_ Debounce PU time (1-8 msgs) RMB4PU= 1 ?
Mirrored Bits RMB_ Debounce DO time (1-8 msgs) RMB4DO= 1 ?
Mirrored Bits RMB_ Debounce PU time (1-8 msgs) RMB5PU= 1 ?
Mirrored Bits RMB_ Debounce DO time (1-8 msgs) RMB5DO= 1 ?
Mirrored Bits RMB_ Debounce PU time (1-8 msgs) RMB6PU= 1 ?
Mirrored Bits RMB_ Debounce DO time (1-8 msgs) RMB6DO= 1 ?
Mirrored Bits RMB_ Debounce PU time (1-8 msgs) RMB7PU= 1 ?
Mirrored Bits RMB_ Debounce DO time (1-8 msgs) RMB7DO= 1 ?
Mirrored Bits RMB_ Debounce PU time (1-8 msgs) RMB8PU= 1 ?
Mirrored Bits RMB_ Debounce DO time (1-8 msgs) RMB8DO= 1 ?
protocol (SEL,LMD,MB,MB8) PROTOCOL= MB ?
Set PROTOCOL = MB or MB8 to enable the MIRRORED BITS protocol.
Use MB protocol with dedicated fiber-optic modems such as the SEL-2800. Set PROTOCOL =
MB8 for use with communications devices that have higher latency times, such as spread
spectrum radios. MB8 is also required for communications devices that require eight data bits,
no parity, and one stop bit.
baud rate (300-38400) SPEED = 9600 ?