Rs 485 Communication - Hanna Instruments HI 710 Series Instruction Manual

output matching a different EC or TDS range, for example,
4 mA = 30 mS and 20 mA = 50 mS.
To change the default values, the setup mode must be en-
tered. Setup codes for changing the analog output minimum
and maximum are 41 or 42, respectively. For the exact pro-
cedure, refer to the setup mode section in the manual.
Note
The analog output is factory calibrated through software. The
user may also perform the calibration procedure as explained
in the following. It is recommended to perform the output
calibration at least once a year.
Note
Analog output resolution is 1.5‰ f.s. with 0.5% f.s. accu-
racy.
Note
The analog output is "frozen" when entering the setup or
calibration mode (after password confirmation).
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RS 485 COMMUNICATION

HI 700222 and HI 710222 are provided with an RS485
port.
RS485 standard is a digital transmission method that allows
long lines connections. Its current-loop system makes this
standard suitable for data transmission in noisy environments.
Data transmission from the instrument to the PC is possible
with the HI 92500 Windows
ware offered by Hanna Instruments.
The user-friendly HI 92500 offers a variety of features such
as logging selected variables or plotting the recorded data. It
also has an on-line help feature to support you throughout
the operation.
HI 92500 makes it possible for you to use the powerful means
of the most diffused spreadsheet programs (Excel
1-2-3 © etc.). Simply run your favorite spread sheet and open
the file downloaded by HI 92500. It is then possible to elabo-
rate the data with your software (e.g. graphics, statistical
analysis).
To install HI 92500 you need a 3.5" drive and few minutes
to follow the instructions conveniently printed on the disk's
label.
Contact your Hanna Dealer to request a copy.
SPECIFICATIONS
The RS485 standard is implemented in with the following char-
acteristics:
Data rate:
Communication:
Line length:
Loads:
Internal termination: none
Excel © Copyright of "Microsoft Co."
©
Lotus 1-2-3 Copyright of "Lotus Co."
®
Windows registered Trademark of "Microsoft Co."
® compatible application soft-
©
, Lotus
up to 9600 bps
Bi-directional Half-Duplex
up to 1.2 Km typ. with 24AWG cable
up to 32 typ.
29