SEL-3031 Instruction Manual
Date Code 20181001
Settings and Commands
Settings
4.16
The protocol setting defines the type of data that will be passing through the serial port.
This setting automatically sets parameters in the radio to optimize best performance. In
P2P mode, any of the three serial ports may be set to any of the protocols. Ports 2 and 3
are always EIA-232 ports. For example, you have three ports of M
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B
ITS
®
(MB8), or any combination or MB8, MODBUS, and STANDARD.
PROTO
sets the intended protocol used to communicate through the radio ports. Set to
STANDARD for all byte-oriented protocols such as DNP3, ASCII, Synchrophasors, or
file transfer. This is the default setting for PROTO and should be used unless you are
using M
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B
ITS
or MODBUS. Set PROTO to MB8 to work with SEL
M
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B
ITS
devices (P2P mode only). The SEL-3031 only supports MB8
M
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B
ITS
protocol in P2P mode. M
IRRORED
B
ITS
MB8 is not supported when
operating in point-to-multipoint (P2MP) mode. See
Section 3: Job Done Examples
for
more information on setting up M
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B
ITS
. Set PROTO to MODBUS when used
with Modbus protocol. MODBUS has strict character spacing rules that warrant the
specific setting to properly transport the protocol. When using MODBUS in P2P or
P2MP the PROTO settings must be set to MODBUS and the connected devices must
be set to 8 data bits, no parity, and 1 stop bit.
ARQ
(Automatic Repeat Request) sets the radio to repeat any radio packets that fail
the data packet error checking or do not arrive at the other radio. ARQ is available
when the PROTO setting is set to Standard or MODBUS. ARQ is disabled when
PROTO is set to MB8. ARQ by default is set to Y. This setting should always be set to
Y unless you use a protocol where time-sensitive data are necessary in an application
where dropping delayed packets is preferred. In P2P mode, ARQ will repeat failed data
packets traveling in both directions. In P2MP mode, only data transferring from the
remote to the master will repeat upon error.
Table 4.7
Port Settings
Settings Prompt
Settings Range
Setting Name := Factory
Default
Protocol
STANDARD, MB8, MODBUS
PROTO := STANDARD
ARQ
Automatic Repeat Request
ARQ:=Y
SPEED
9600, 19200, 38400 (9600,
19200 with Encryption Card)
SPEED=19200 (9600 with
Encryption Card)
CTS State
Asserted, Deasserted
CTS := DEASSERTED
Echo
ON, OFF
ECHO := OFF
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