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4.95
Date Code 20081022
Instruction Manual
SEL-787 Relay
Protection and Logic Functions
Port Settings (SET P Command)
Set the speed, data bits, parity, and stop bits settings to match the serial port
configuration of the equipment that is communicating with the serial port.
After Port Timeout minutes of inactivity on a serial port at Access Level 2, the
port automatically returns to Access Level 0. This security feature helps
prevent unauthorized access to the relay settings if the relay is accidentally left
in Access Level 2. If you do not want the port to time out, set Port Timeout
equal to 0 minutes.
Set PROTO := SEL (standard SEL ASCII protocol), MOD (Modbus RTU
protocol), or one of the M
IRRORED
B
ITS
protocols, as needed for your
application. For detailed information, refer to
Appendix E: Modbus RTU Communications
,
and
.
Use the MBT option if you are using a Pulsar MBT9600 baud modem (see
for more information). With this
option set, the relay transmits a message every second processing interval and
the device deasserts the RTS signal on the EIA-232 connector. Also, the
device monitors the CTS signal on the EIA-232 connector, which the modem
deasserts if the channel has too many errors. The modem uses the device RTS
signal to determine whether the MB or MB8 M
IRRORED
B
ITS
protocol is in
use.
Set the AUTO := Y to allow automatic messages at a serial port.
The relay EIA-232 serial ports support software (XON/XOFF) flow control. If
you want to enable support for hardware (RTS/CTS) flow control, set the
RTSCTS setting equal to Y.
Set FASTOP := Y to enable binary Fast Operate messages at the serial port.
Set FASTOP := N to block binary Fast Operate messages. Refer to
Appendix C: SEL Communications Processors
for the description of the
SEL-787 Fast Operate commands.
Set PROTO := DNET to establish communications when the DeviceNet card
is used.
shows the additional settings, which can be set only at the
rear on the DeviceNet card. Once the relay detects the DeviceNet card, all
Port 4
settings are hidden. Refer to
Appendix G: DeviceNet Communications
for details on DeviceNet.
Table 4.47
Rear-Panel DeviceNet Port Settings
Setting Name
Setting Range
MAC_ID
0–63
ASA
8 Hex characters assigned by factory
DN_Rate
125, 250, 500 kbps
Summary of Contents for SEL-787
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