User Manual

Ports RS-485 Configuration
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8.9.8 Restoring Default Port Settings
To restore all ports to their default settings, use the Purge Port command. Use caution with this command;
any changes that you’ve made with the Set and Define commands will be erased.
Figure 8-38: Restoring Default Port Settings
If the Purge Port command cannot be used (for example, if authentication has been defined on all ports), the
settings can only be restored by using the Boot Configuration Program. See your Installation Guide for
details.
8.10 RS-485 Configuration
Note: This section only applies to the SCS200.
While the SCS serial ports are is initially configured for RS-232 networking, they can also be configured
for RS-485 networking. The RS-485 standard allows a serial connection to be shared like a “party line.” As
many as 32 devices can share the multidrop network. Typically, one device is the master and the other
devices are slaves. There are a few important things to note about RS-485 networking with the SCS.
◆ The SCS can be used in either two-wire or four-wire mode. Refer to the following sections to
determine which mode to use.
◆ The maximum RS-485 network cabling length (without repeaters) is 4,000 feet. Lantronix
recommends the use of shielded twisted-pair cabling.
◆ A large number and varieties of protocols run over RS-485. However, the SCS does not convert or
interpret serial data. It only moves data between serial and Ethernet. Any RS-485 protocol will have
to be implemented by host software.
Note: See your Installation Guide for the RS-485 pinouts.
To enable RS-485 mode on the SCS, enter the Define Protocols RS485 command. RS-232 mode is enabled
by default.
Figure 8-39: Enabling RS-485 Mode
Local>> PURGE PORT 2
Local>> DEFINE PROTOCOLS RS485 ENABLED