Electrical and Cable Specifications

Input Specifications

The current JS-20 scanners have two connectors: an LTW Industrial Sealed Ethernet, and a Switchcraft EN-3 8 conductor circular sealed connector. The 8 conductor EN-3 connector is used to supply power as well as encoder and synchronization signals to the JS-20 scanner.

The encoder inputs are RS-422 5-V differential signals. They support encoder rates up to a maximum of 100,000 pulses per second.

The Start Scan input signal can be driven by either RS-422 5V differntial, 5V push pull, or open collector outputs. The Start Scan signal is edge triggered, and by default triggers on a falling edge. The StartScanTriggerOnHigh parameter reverses this, and causes the scanners to trigger on a rising edge.

8-Wire Pinout

JS-20 scanners are generally connected with our standard 8 wire cable. Alpha 2643C or an equivalent cable is suggested.

Table 2. Alpha 2643C / EN-3 / 8-Wire Diagram

Wire ColorEN-3 PinFunction
White1Encoder B-
Green2Encoder B+
White/Black3Start Scan-
White/Red4Start Scan+
White/Yellow5Encoder A-
White/Green6Encoder A+