RS-232
↔
RS-422 INTERFACE CONVERTER
7
1. The Converter does not require special handshaking signals in order to operate.
2. The Converter should always be configured the opposite of the equipment it’s connected to if
straight-through cabling is used. For example, if you are connecting a modem (a DCE device) to the
Converter, configure the Converter’s port connected to the modem as DTE.
3. Some industrial controllers include RTS+, RTS-, CTS+, and CTS-. If necessary, in most cases, these
can be jumpered together.
4. According to EIA specifications, RS-422 signals are A and B, where mark = B>A in voltage and space
+ A>B in voltage. Many manufacturers label their leads as + and -. In most cases, +=B and -=A is the
scheme the Converter uses. However, some manufacturers have reversed this scheme. Consult the
manufacturer of your RS-422 equipment if you have problems.
Models
There are three models of the RS-232
↔
RS-422 Interface Converter.
•
IC456A-R3 —
a standalone unit for 115-VAC operation.
• IC456AE-R3 —
a standalone unit for 230-VAC operation.
•
IC456C-R3 —
a printed circuit card for rack-mounted units.
The same RS-232
↔
RS-422 printed circuit card is used for both 115- and 230-VAC applications. An
Interface Converter Rack (RM060) is available through your sales representative. This is a 19-inch rack
capable of holding up to eight printed-circuit cards. The rack has its own power supply which is switch
selectable between 115- and 230-VAC operation.
If you ordered the IC456A-R4 or IC456C-R4, you should have received cables with your RS-232
↔
RS-422
Interface Converter.
