Don't use the Modicon Integrator.
Use the Modicon Foreign Device Integrator. It can handle strings. It can
also handle "Modicon-like" devices that have other non-Modbus data types,
e.g., 32-bit floating point.
Regards,
Alex Johnson
10707 Haddington
Houston, TX 77043
713.722.2859 (office)
713.722.2700 (switchboard)
713.932.0222 (fax)
[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
-----Original Message-----
From: Loupe, Rory (RJ) [SMTP:[EMAIL PROTECTED]]
Sent: Monday, April 23, 2001 3:07 PM
To: 'Foxboro - Cassandra'
Subject: ASCII Characters in 16 bit registers
List,
I will be using an Integrator 30 (Modbus) to communicate to an
external
device. All of the data is packed in 16 bit registers as unsigned
16 bit
integers. Since I can scale this value to obtain a floating point
number
this does not pose a problem for number values. The problem is that
an
ASCII string of text is packed two 8 bit characters per 16 bit
register and
this is the only way the device will transmit ASCII strings.
The only solution I can come up with is to receive the 2 character
16 bit
register into an AIN block. Then feed the AIN into a CALC and mask
out each
character into it's own Integer Output. Then take the two Integer
Outputs
from the calc block and feed them into an Independent block. Then
concatenate the two integer values into a strings.
This does not seem like a very elegant solution. Does anyone know
of a
better way to accomplish this task?
Thanks,
Rory Loupe
The Dow Chemical Company
LHC-3
P.O. Box 150, Building 6801
Plaquemine, LA 70765-0150 USA
Phone: 225.353-6409 Fax: 225.353.6968
E-mail: [EMAIL PROTECTED]
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