Most industrial computer systems provide standard RS-232 serial ports. Though widely accepted, RS-232 has limited transmission speed, range, and networking capabilities. The RS-422 and RS-485 standards overcome these limitations by using differential voltage lines for data and control signals, which transparently converts RS-232 signals into isolated RS-422 or RS-485 signal with no need to change any hardware or software. The I-7520/I-7520A lets you easily build an industrial grade, long-distance communication system using standard PC hardware.
The design of the isolation between the I-7520 and the I-7520R/AR is different. If the user wants to supply power from the PLC/PC, the I-7520R/AR should be used, otherwise the isolation will be broken. Refer to the I-7000 bus converter manual for detailed information.
Auto Switching Baud Rate, 300~115200 bps
3000 VDC Isolation Protection on the RS-232 side
Transmission Speed of up to 115200 bps
ESD Protection for the RS-232/422/485 Data Line
Power Input of +10 ~ +30 VDC
Supports Operating Temperatures from -25 °C ~ +75 °C
TxD, RxD, GND
TxD+, TxD-, RxD+, RxD
The RS-422 and RS-485 cannot be used simultaneously
2-wire Cabling/4-wire Cabling
Belden 8941 (2P twisted-pair cable)/Belden 8942 (4P twisted-pair cable), if different cables are used, the transmission distance may change
Max. 1,200 m for at speed 9.6 kbps; Max. 400 m at 115.2 kbps