Protocol: Serial
Devices: Hitachi H Series PLC Peripheral Port or Comm-2H module.
(eg. H20,H40.. H200,H252... H700,H702,H2000,H2002..etc )

The Server communicates with the PLC via the RS232 port on a personal computer. The Server supports the following PLC data types: X, WX, DX, Y, WY, DY, L, WL, DL, M, WM, DM, R, WR, DR TC, Timer Status & Elapse Counter Clear. Topics allow a choice of Successive or Random access of addresses. Successive messages fetch data of the same type in a compact request. Random messages fetch a mix of data types in a single message.