Hach 910, Инструкция по эксплуатации инструмента

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Section 2
Page 21
SoftwareCommunications.fm
Modem Communications (Models 920 and 930 Only)
Figure 3 Serial Port Pins
2.4 Modem Communications (Models 920 and 930 Only)
CAUTION
Use care when making modem
connections as high voltage may
be present on the phone wires!
Models 920 and 930 can be configured with a 14,400 baud, cellular capable
internal telephone modem (Cat. No. 4872).
These advanced, very low power modems let you communicate with Hach
loggers over long distances using public telephone lines or a cellular phone.
The Model 920 and 930 modems communicate at speeds from 300 to 14,400
baud. Connect the red and green wires from the logger modem connector to
the red and green wires provided by the telephone company.
Figure 4 Modem Receptacle Pins
2.5 Sampler Receptacle (Models 920 and 930 Only)
2.5.1 Sampler Receptacle Pin Descriptions
The optional “sampler” port lets you connect Model 920 or 930 to a Hach
wastewater sampler. This option provides several features:
• Flow proportional sampling
• Stormwater trigger, based on level and/or rate of rainfall. Useful for the
USEPA NPDES permitting program.
• Sample history logging
A
C
D
E
F B
Table 1Serial Port Pin Descriptions
Pin Letter Description Wire Color
A B+ (used to power DTU) White
B Ground Blue
C DSR Yellow
D RCD Black
E DTR Red
F TXD Green
A
B
Table 2Modem Receptacle Pin Description
Pin Letter Designation Color Description
A Tip Green Ground
B Ring Red Signal