Delta RMC101 - Manual (Page 64)

RMC100 and RMCWin User Manual
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The RMC's serial port has a DTE DB9 serial connector. For further wiring details, see RS232
Wiring.
Note: RMCWin and the RMC have been tested with USB-based serial ports. In the best case,
the USB-based serial ports were twice as slow as a standard serial port. One of the USB-based
serial ports we tested with also did not work with Windows 2000. This problem was isolated to
the USB-based serial port device driver, and therefore was not the fault of RMCWin, the RMC,
the PC, nor Windows 2000. Therefore, take care in selecting a USB-based serial port. The
Xircom PGSDB9 had consistent, bug-free performance on all Windows platforms, although it
was three times slower than a standard serial port.
Using a simple RS232 cable has the disadvantages of no isolation on the RMC end (and typically
no isolation on the PC either), and a typical cable length limitation of 50 feet. To increase the
length up to 4000 ft, an RS422/485 segment can be added using two RS232-to-RS422/485
converters. Isolation can also be included in the converters:
Both methods still have the disadvantage of only being able to address a single RMC from each
PC serial port. Therefore, it may be necessary to add more serial ports to a PC or switch cables
to communicate with more than one RMC from a PC.
Comparison with Other Communication Drivers
• TCP/IP Direct to RMC-ENET: The direct TCP/IP method only works with an RMC-ENET and
does require an Ethernet adapter in the PC, but it adds higher performance, isolation, longer
cable distances, routing across intranets and the Internet, and addressing of unlimited RMCs
from a single PC.
• TCP/IP-to-RS232 Bridge: The bridge method is the slowest and requires an Ethernet adapter in
the PC, but it adds isolation in the bridge, longer cable distances, routing across intranets and the
Internet, and addressing of unlimited RMCs from a single PC.
See also: RS232 Wiring, Serial Configuration, TCP/IP Direct to RMC-ENET, TCP/IP-to-RS232
Bridge, Connecting RMCWin to an RMC
3.3.7.2 Communication Driver: Serial Configuration
The settings for the "RS-232 Monitor" serial port on the RMC CPU are as follows: