Interface Converter, RS-422 to RS-232
The DCB RS-422 to RS-232 interface converter is just 1.75" long and 1" in diameter. It is available in a line powered unit that is powered by +12 Vdc on pin 1 or powered by an external 120Vac wall-mount power supply. While designed for use with the DCB SR multiplexers, it is suitable for converting RS-422 to RS-232 with any manufacturers' equipment. The DCB converter requires a plus DC voltage on pin one of the RS-232 connector to power the circuit. The unit will convert RS-232 to RS-422, RS-530, and V.35 (transmit and receive data only).
For more demanding applications, our industrial rated RS-422 to RS-232 converters may be more appropriate. They were designed to a wider temperature range, various power supply voltages, and include screw-down terminals. Information on those products is here.
Typical Application from DCB SR mux to an RS-422 terminal, showing
|RS-561 Interface Pin #||RS-232 end of converter||RS-422 end of converter|
|DSR 1 ----->||1 Positive 12Vdc voltage required, 5 - 10 ma.
(on line-powered unit)
|DCD 2||2 n/c||2 n/c|
|Busy 3||3 n/c||3 OUTPUT Rx Data -|
|Sig Gnd 4||4 Sig Gnd||4 INPUT Tx Data +|
|Rx Data 5 ---->||5 Rx Data INPUT||5 INPUT Tx Data -|
|Tx Data 6 <---||6 Tx Data OUTPUT||6 OUTPUT Rx Data +|
"n/c" refers to "no connection"
The above arrows show the signal direction. Note that the RS-422 leads are
balanced, with 2 OUTPUT wires (pin 3 is -, pin 6 is +), and 2 INPUT wires
(pin 4 is +, pin 5 is -).
Pin 5 of the RS-232 side RJ-45 connector is data INPUT to the converter, Pin 6 of the RS-232 connector is data OUTPUT from the converter.
|9 pin serial port||RJ-45 connector at
RS-232 end of converter
|RJ-45 connector at
RS-422 end of converter
|4 - DTR ->||1 = +6 to +12 Volts DC required from RS-232 device unless DC adapter is used. Typical current is 9 ma.||1 - n/c|
|2 - n/c||2 - n/c|
|3 - n/c||3 OUT Rx Data -|
|5 - Signal Ground||4 - Signal Ground||4 IN<- Tx Data +>|
|3 - Rx Data ->||5 - Rx Data IN||5 IN<- Tx Data ->|
|2 - Tx Data <->||6 - Tx Data OUT<->||6 OUT Rx Data +|
|7 - n/c||7 - n/c|
|8 - n/c||8 - n/c|
On the interface converter, the label reads "RS-232 to RS-422". The end
labeled "RS-232 " is electrically RS-232. The end labeled "RS-422" is
Pin Numbering from the cable perspective
Pin Numbering from the connector perspective
RJ45 version - Two RJ-45 modular 8-conductor jacks
1.75" long, 1" diameter
Txd and Rxd lines ONLY are converted, Control leads are not passed through the converter
Temperature range 0 to +70 C standard, -40 to +85 C Industrial model
Item Number Description Price Buy Now! 9802034 RS-422 to RS-232 Interface Converter (powered from RS-232 lead) $ 39 Qty: 9802044 RS-422 to RS-232 Interface Converter with 120VAC- DC adapter $ 59 Qty: 9802045 RS-422 to RS-232 Interface Converter with 240VAC- DC adapter $ 59 Qty: 9802059 RS-422 to RS-232 Interface Converter Rated -40 to +85C (powered from RS-232 lead)(/a) $ 54 Qty: 9802057 RS-422 to RS-232 Interface Converter -40 to +85 C w/ 120 V Power adapter $ 74 Qty:
Data Comm for Business Inc.
2949 County Road 1000 E
Dewey, Il 61840
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