Systech Corporation RCS/3000, Руководство по оборудованию

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18 Using the RCS/3000 in RS-422 or RS-485 Mode
Pin # Name Direction
1 Not used
2 RXB Input
3 TXB Output
4 Not used
5 GND
6 Not used
7 TXA Output
8 RXA Input
9 Not used
The pins designated as not used should have nothing connected to them.
Be sure the wires are terminated as indicated in the wiring diagrams in the previous section.
In addition, as a fail safe to prevent floating wires, the RCS/3000 provides internal 2k bias
resistors that pull the lines to a known state when they are not being driven. The bias
resistors cannot be removed or altered.
Configuring an RCS/3000 serial port for RS-422/485
To change the interface using the command line interface of the RCS/3000, use the Error!
Reference source not found.command. The format is:
set interface { port number(s) } { rs232 | rs422 | rs485 } [ i ]
The set interface command sets the port to the specified physical layer interface. The default
is RS-232.
For example, to set the interface for port 3 to RS-485, type:
set interface 3 rs485
The RS-485 setting will go into effect when the port is closed and re-opened. To have the
interface configuration applied immediately, rather than when the port re-opens, use the i
option.
set interface 3 rs485 i
To display the current interface configuration setting for port 3, type:
show interface 3
If no port is specified in the show interface command, the interface configuration for all
ports will be displayed.
You can also change the electrical interface using the port configuration section of the
browser interface.