Date Code 20181001 SEL-3031 Instruction Manual
Settings and Commands
Commands
4.17
Ports 2 and 3 are fixed at 9600 bps with the SEL-3044 Encryption Card. The default
setting for SPEED is 19200, or 9600 bps with the Encryption Card. If the radio is in
P2P mode and the Port 1 SPEED is set to 38400 then Port 2 will be disabled. In P2MP
mode only Port 1 is enabled and a setting of 9600, 19200, or 38400 bps (9600 or 19200
with the SEL-3044 Encryption Card) is allowed.
The CTS setting is used to set the state of the CTS (Pin 7) line on each of the ports. In
most cases this setting should be set to deasserted. Most SEL devices require CTS
deasserted for them to respond to DNP requests. The SEL-3031 does not support
hardware flow control. It will only assert or deassert the CTS line to signal connected
equipment to continue communication. If radio synchronization is enabled, SYNC z
OFF, then Port 3 CTS setting is disabled.
The ECHO setting is only enabled when Port 1 is ordered as an EIA-485 device. This
setting is used to set up a two-wire versus four-wire EIA-485 connection. The default
ECHO setting is set to ON, which works with four-wire EIA-485 applications. For
two-wire operation, the ECHO setting must be set to OFF, and Pins 1 and 7 and Pins 2
and 8 must be connected together (see Table 2.11).
Commands
Access Levels
Issue commands to an SEL-3031 serial port to view or change device settings or
retrieve information. For security, these commands are available on different password-
protected access levels. Throughout this section each command description indicates
the access level at which the command is available. There are four access levels in the
device, offering varying levels of control.
➤ Access Level 0 commands are the lowest security level. Access
Level 0 commands support minimum identification.
➤ Access Level 1 commands are for reviewing information only
(e.g., status) and not for making any changes.
Table 4.8 Fixed Port Settings
Port Setting Fixed Port Settings
Fixed Port Settings With
SEL-3044 Card
Data Rate (Port 2 and 3) settable 9600 bps
Data Bits 8 8
Parity None None
Stop Bit 1 1
RTS/CTS Flow Control Off Off
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