7.10
SEL-2032
Communications Processor
Instruction Manual
Date Code 20120126
Settings
Port Configuration (SET P) and Communication Settings
The VT communications also support automated data collection functionality.
The
DCF
command allows automated data collection on ports 17 and 18 (see
for details). Use the user-defined commands (CMD1–
CMD8) and message trigger (D1–D12) to collect IED data as you would with
serial ports. See the
SET A
and
SET U
commands in
.
Data Flow Control
All SEL devices, including the SEL-2032, support XON/XOFF software data
flow control.
The SEL-2032 also supports RTS/CTS hardware data flow
control. If the device connected to an SEL-2032 port has XON/XOFF
software data flow control capability, you should enable this flow control
method on both the SEL-2032 and the connected device. You should use RTS/
CTS hardware data flow control only if the connected device has RTS/CTS
capability and does not have XON/XOFF capability. In either case, both the
SEL-2032 and the connected device must have the same data flow control
method enabled.
You can enable XON/XOFF data flow control on an SEL-2032 port with the
SET P
command by setting XON_XOFF = Y. With XON/XOFF data flow
control enabled, the SEL-2032 monitors the volume of data in its received
data buffer on that port and transmits an XON (hexadecimal code 11)
character when that port’s buffer drops below one-quarter (25 percent) full.
The SEL-2032 transmits an XOFF (hexadecimal code 13) character when that
port’s buffer is over three-fourths (75 percent) full. A device connected to the
SEL-2032 port with XON/XOFF software data flow control enabled should
terminate message transmission at the end of the message in progress when an
XOFF character is received from the SEL-2032 and should resume
transmission when an XON character is received.
Likewise, you can use XON/XOFF to control the SEL-2032 message and data
transmission. When the SEL-2032 receives an XOFF character when it is
transmitting a message, the SEL-2032 pauses transmission until it receives an
XON character. If the SEL-2032 is not sending a message or data when it
receives XOFF, the SEL-2032 does not send any new transmission until it
receives an XON character from the other device.
Set RTS_CTS = N for any SEL-2032 to SEL relay connection. If RTS_CTS =
N, the SEL-2032 RTS output will always be asserted, and the CTS input status
will have no effect on communication.
Consult the instruction manual or contact the device vendor to determine the
proper flow control technique for each non-SEL device. If you select RTS/
CTS hardware data flow control, make sure that the cable you are using to
connect the device to the SEL-2032 is wired for RTS/CTS.
When RTS/CTS hardware flow control is required, use
SET P
to set
RTS_CTS = Y. Automatic communication sources with RTS/CTS hardware
data flow control enabled must stop message transmission immediately when
the SEL-2032 deasserts RTS so they do not overwrite the SEL-2032 buffer on
that port. Likewise, if RTS_CTS = Y, the SEL-2032 does not send message or
data characters until the CTS input is asserted.
Modem Operation
There are a number of issues to consider if you are using a modem. In
particular, flow control and disconnect sequences need to be considered.
When a modem connection is made, it is possible for the phone line
connection to be at a lower baud rate than the modem-to-SEL-2032
connection. This can lead to a loss of characters during large data transfers,
because the SEL-2032 can overrun the modem. This can be prevented by
Summary of Contents for SEL-2032
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