I don't think that document is going to help anyone here advise you on how to connect the zigbee modules. Your question as to whether or not an arduino can be used with the zigbees requires knowing the ISA100 output type of the Yokagawas, specifically
(assuming it is serial or you wouldn't be suggesting this, what baud rate ? What is the data format ? Is it packet data or if not then where is the Yokagawa manual documentation that defines what it will send and when or how ? Does it send on command or does it transmit continuously and if so in what format ? How could anyone here answer that question ? If you can connect the Yokagawa to a PC serial port and capture the output in a terminal output capture file and post that , then we would have something to base our answers on. Without that, how can you expect anyone here to be familiar with Yokagawa ISA100 output data format? Is that
even vaguely arduino related ? (granted there may be some members here who know that, they are few and far between). Give us more information on the data format and if possible post the capture file.