Which serial cable is needed to program a SY/MAX PLC?
• The SY/MAX Model 100, 300, 400, 500, 600, and 700 series PLCs all use the same 9-pin RS-422 serial ports. The SC902 is the standard RS-232 to RS-422 converter cable used to connect a PC COM: port to SY/MAX port. This cable may also be used to connect a PC to a NIM, EPE5, MEB, SPE4, IBSM, AIM4, CAM500, SY/LINK board, DLOG, or any other SY/MAX pinout connector. • How is an EPE5, MEB, RM14K, SPE4, or UCM4 used without a PLC rack? • The NRK2 is used to mount and power a single Niobrara SY/MAX module for stand-alone operation. • Must I rack address an EPE5, MEB, or SPE4 PLUS? • Only if you are using the mailbox registers for I/O between the module and the PLC. Most installations simply use the card as a protocol translator/router and do not use the mailbox registers at all. The module may often be placed in slots 17 and 18 on an HRK300 rack. • When is the external power supply needed on the SC902 cable? • The external power supply is needed on ports that use active RTS/CTS RS-422 handshak
