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Cod. Carel. +030221221 – rel. 1.0 dated 20/02/01
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Power supply - terminal F
PlantWatch must be supplied by a dedicated electrical line fitted with an exclusive two-pole switch.
Reset external modem - terminal E
Terminal E may be used for the power supply of the external modem. It is used only if the configuration includes the external
modem.
The relay is normally closed; at the PlantWatch reset and then at regular 20 minute intervals, before sending the modem
initialisation commands, it is open to ensure the hardware reset of the modem. The opening time is 1.5 seconds.
Alarm relay - terminal D
The alarm relay allows the PlantWatch to be connected to signal devices that operate by impulses, such as telephone diallers, as
well as sirens, signal lamps etc..... The normally open/closed modes can be selected by the corresponding parameter.
RS485 network - terminal C
This terminal is connected to the 3-wire RS485 network (twisted pair + shield) that connects the instruments controlled by
PlantWatch. The network should be terminated with a 120Ω, ¼ watt resistor. Use AWG20/22 cables with a capacitance between
the leads of less than 90pF/m (BELDEN 8761-8762 cables).
The RS485 section is optically-isolated from the other signals present in the PlantWatch system: RS232 line and telephone line.
RS232 line - connector B
The RS232 line is available using an 8-way telephone connector. The direct connection to a personal computer or to the external
modem can be made using the adapters supplied in the PLW0PMD000 kit for connection to the modem, or in the PLW0PPC000
kit for connection to the PC. The kit includes a 5-metre, 8-way flat cable fitted with male connectors. If the length of cable
supplied is not sufficient, an 8-way telephone cable can be wired to the required length (maximum length 10 metres).
PLW0PMD000 PLW0PPC000
Max 10 m
RJ45 M DB 25 M RJ45 M DB 9 F
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Telephone line - connector A
Connector A (RJ-11) is present only in the PlantWatch version fitted with internal modem. It can only be used for connection to
a PSTN telephone line
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