Schweitzer Engineering Laboratories SEL-321 - Communications Ports Specifications

2-44 Specifications Date Code 20011026
SEL-321/321-1 Instruction Manual
COMMUNICATIONS PORTS SPECIFICATIONS
Table 2.28 gives specifications for the three serial communications ports and the time-code input.
Table 2.28: Communications Ports Specifications
Port 1 Port 2 Port 3 IRIG-B Comment
Description
Type EIA-232 Time
Code
Protocol SEL
LMD (SEL-321-1 Relay Only)
N/A SEL = Standard Communica-
tions
LMD = Distributed Port
Switch Protocol (See
Appendix G)
MB N/A
MB = Relay-to-Relay digital
communications only
one port (See
Appendix H)
Baud
Rate
300
1200
2400 (Default)
4800
9600
19.2 k
38.4 k
300
1200
2400 (default)
4800
9600
19.2 k
N/A
Data
Bits
8 (Default)
7
6
8 N/A
Parity N (Default)
E
O
N N/A N = None
E = Even
O = Odd
Stop
Bits
1 (Default)
2
1 N/A
Time 0-30 Minutes N/A
Out 0 (Default) 5 (Default) 0 = Port does not timeout
Auto Y N N/A Y = Designated auto
N = Not auto
N (Default) Y (Default)
RTS_CTS Y
N (Default)
MBT
N/A N/A Y = Enable RTS/CTS hard-
ware handshake
N = Disable RTS/CTS hard-
ware handshake
MBT = MBT9600 modem
used for Relay-to-
Relay Digital
Communications
FAST_OP Y
N (Default)
N/A Y = Enable fast operate
command processing
N = Disable fast operate
command processing