SAMI G S Communication via RS 485 terminal RS 485 serial communication is possible from an optional remote control panel SAGS 700 PAN or from a PC or a PLC. PC and PLC applications require software utilising the protocol of the SAMI GS series. A maximum of 31 units can be connected into a bus. All units connected must have a different ID number (para. 17.1). All functions of the SAMI GS standard control panel can be utilised via the serial bus: Recommended max. cable length is 1200 m with 0.5 mm 2 , 50 pF/m cable and 500 m with 0.2 mm 2 , 50 pF/m cable. Maximum common mode voltage difference between terminals GND2 or GND3 of any units may not exceed +7 V.
The cable is connected to the screw terminal X51 on the Control Interface Card, see Figures below. Note! The last unit connected to the serial bus without any control device must be terminated by setting plugs S3 and S4 on the Control Interface Card to the position TERM. - Start-up - Parameter setting - Monitoring and supervision - Drive commands Maximum control bus length depends on electromagnetic disturbances, cable size and cable screening. For further information on RS 485 serial communication please refer to SAMI GS Bus protocol manual (order code: EN 5805782-7). Connection of Remote Control Panel SAGS 700 PAN: SAGS 700 PAN To the next drive Example PC connection:
*) RS 232C RS 485 bus 1 2 *) If the PC has an RS 232C serial communication port, a signal converter RS 232C/RS 485 is needed between the SAMI GS and the PC. 47 X51 Terminal Signal Function 1 +8 V Power to the panel Power 0 V 2 GND2 3 SCRN1 Screen 1 4 GND3 Ground 5 SGNA RS signal A 6 SGNB RS signal B 7 SCRN2 Screen 2 Black Green Black Blue Orange Black Terminal X51 Function 1 +8 V Power to the panel 2 GND2 3 SCRN1 Screen 1 4 GND3 Ground 5 SGNA Signal terminal A 6 SGNB Signal terminal B 7 SCRN2 Screen 2