RS422/RS232 Interface Converter, low power, passive, -40C/+85C
$50.00
In stock
Description
DESCRIPTION
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 pinouts:
| 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) |
1 n/c |
| 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 + |
| CTS 7 | n/c | n/c |
| RTS 8 | n/c | n/c |
“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.
Typical application using a PC 9 pin serial port:
| 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 electrically RS-422.
| Pin Numbering from the cable perspective | Pin Numbering from the connector perspective |
SPECIFICATIONS
Connectors
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
Additional information
| Weight | 2 lbs |
|---|---|
| Dimensions | 5 × 5 × 5 in |
