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7000 Bus Converter User Manual (version 1.2,Feb/2003, 7PH-006-10) --------------- 79
6.4 RS-232 Devices Network
Some RS-232 devices can be connected to the 7000 RS-485
network very easily, just like the PC or PLC introduced in Sec 2.7 and Sec.
2.8. These RS-232 devices must adhere to 3 rules given as follows:
Rule 1: cannot send out the RS-232 signal in normal,
operating state.
Rule 2: every device has a unique device address
Rule 3: will not send out a RS-232 signal if the destination
address does not match with the device address
The software for RS-232 device networking and PLC
networking is very similar. The only difference is the command
format. The command format of PLC is always different for
different manufacturers. Refer to “NAP000S User Manual” for
software details.
RS-232
RS-485
PWR-24
Connecting 256 RS-232
devices max. Without a
repeater, the 7510
7520
7520
7000 series
Host PC
RS-232
7520
RS-232
RS-232 device
Fig 34
RS-232 device