The SA2 is a 1-channel RS422/485 half/full duplex interface adapter with optical isolation.
SA-Adapters are small universal boards providing the physics for legacy serial I/O, fieldbus interfaces and other small I/O functions. One serial line is provided per adapter, which can be plugged directly to the CPU board as a mezzanine. Alternatively, the adapter can be connected to the front panel via ribbon cable. The SA concept allows to add additional I/O interfaces to many of MEN's CPU boards, enhancing flexibility with regard to the line transceivers and isolation requirements. Whether a specific SA-Adapter (or a mix of different SA-Adapters) fits on a specific CPU board is determined by a combination of mechanical, performance, FPGA and operating system criteria and needs to be verified for every board configuration requested.
1 RS422/485 channel
Shielded 9-pin D-Sub connector
2 data lines
2 power supply lines
RS422/RS485, half/full duplex, optically isolated
Via front panel on a shielded 9-pin D-Sub receptacle connector
As a piggy-back board directly on a CPU board
Via ribbon cable
Voltage between the connector shield and isolated ground is limited to 180V using a varistor; AC coupling between connector shield and isolated ground through 47nF capacitor