ICP DAS USA 7000 user manual This is the third function

rates are different. For example, ￿7xxx=module address 01, baud rate=1200 ￿7xxx=module address 01, baud rate=9600 ￿7xxx=module address 01, baud rate=115200

These three modules can share the same RS-485 network, generated by ￿7520.

(4)Therefore there is 256*8=2048 modules max. In one RS-485 network with a repeater (7510).

The “search function” given in NAP7000S can search for all these 2048

modules in one RS-485 network. Refer to “NAP7000S User Manual” for completely source listing of “search function”.

When the RS-485 network is over 4000 ft or 1.2Km, the RS-485 repeater (7510) must be added to extend the RS-485 network. For example, if the ￿RS-485 is over 4000 ft or 1.8 Km, the ￿7510 must be added to extend ￿RS-485 to ￿RS-485. And if the ￿RS-485 is too long, the user should use another 7510 to extend another RS-485 network. This is the second function of 7510.

The power ground of the 7000 series is common ground to the RS-

485 network. This feature is the same as the Adam 4000, Nudam 6000

and DATAFORTH 9B series. Therefore all the modules in the same RS-

485 network are common ground. For example, the all modules between ￿7xxx and ￿7xxx share the same ￿RS-485 network and all are common ground. The ￿RS-485 length can be up to 4000 ft or 1.2 km, this is a very long path. This long path makes the RS-485 network very susceptible to

network noise by high energy transient in this environment. If this noise is

too great, all the modules in the RS-485 network may be damaged

simultaneously. This is highly possible and occurs often in real world applications. It is strongly recommended to add another isolation repeater, the 7510, to break the long path RS-485 network into several short RS- 485 networks to avoid all the modules being damaged at the same time.

This is the third function of 7510.

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