© Sealevel Systems, Inc.
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SeaLINK User Manual
Port ‘x’ Defaults
The following is a list of settings that are displayed on the Port Settings page.
Default settings are in brackets:
Baud Rate
– [
57600
] Text box
You can enter any number from 1to 921600, but Windows limits the
maximum baud rate to 230400. It may not be possible to hit the exact desired
baud rate, however the 16C950 compatible UART will attempt to set it as
closely as possible and will be within the acceptable 2% range. Enter any
valid baud rate and click Submit. The page will refresh and display the
nearest calculated baud rate.
Data Bits
– 5, 6, 7, [
8
]
Stop Bits
– [
1
], 1.5, 2
Parity
– [
none
], even, odd, mark (forced 1), space (forced 0)
Flow Control
– [
none
], Software (Xon/Xoff), Hardware (RTS/CTS)
RS Mode
– [
No Default
], RS 232, RS 422, RS 485 (no echo), RS 485 (echo)
You should change this setting to match the electrical interface on the serial
device you are using. Certain SeaLINK devices also require dipswitches to
be properly configured – refer to the Hardware Configuration section for
more information. On multi-interface products, each port is individually
configurable.
Protocol
– [
Ignored
], Modbus RTU
Enable if communicating with Modbus serial COM devices. When enabled,
the SeaLINK device won’t transmit until a full Modbus packet has been
received, which helps keep Modbus packets intact.
Termination
– [
Terminated
], Non-Terminated
For SeaLINK devices with software selectable termination (currently 4162
and 4163) using RS-422 or RS-485 mode and no hardware termination
jumpers, this dropdown list can enable/disable line termination.
Input Alias – [None]
, DCD, DSR, RING
For the SeaLINK 4103, this sets the modem signal that the input is aliased to.
Refer to the 4103 Digital I/O section of this manual for more information.
Relay Alias – [None]
, DTR.
For the SeaLINK 4103, this sets the modem signal the relay is aliased to.
Refer to the 4103 Digital I/O section of this manual for more information.
‘Always use defaults’
– Checkbox
When using a virtual serial port protocol (SeaLINK software), application
programs may change the port settings dynamically after opening the ports.
To prevent programs from changing these settings, click the “Always use
defaults” checkbox and submit. This can be useful if you specify a custom
baud rate that is not available from your operating system. Applications can
still attempt changes, but the SeaLINK device will ignore them.
