Re: [foxboro] How to reverse a 16 bit register - PAKIN

Thanks Davide,

We will test the mirroring options.

Regards,

bud/

-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx
[mailto:foxboro-bounce@xxxxxxxxxxxxx]On Behalf Of Crivellotto, Davide
Sent: April 4, 2009 6:23 AM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] How to reverse a 16 bit register - PAKIN


Bud,
if you are using the gateways to communicate using Modbus protocol, you are 
using FDSI Modbus driver.
It has several options, in order to read, as an example, only 16 bits (instead 
of 32); and then, you can mirror the 16 bits, or you are also able to swap the 
two bytes.
Reading 32 bits, you have different more options, on swapping and so on.
You can get all the details on the "FDSI Driver - Modbus", on the document 
B0700BG.

Hope this is applicable to you.

Regards,
Davide

-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On 
Behalf Of Bud.Kahovec@xxxxxxxxx
Sent: martedì 31 marzo 2009 18.50
To: foxboro@xxxxxxxxxxxxx
Subject: [foxboro] How to reverse a 16 bit register - PAKIN

We are converting gateways to FDSI. We need to reverse a two byte register 
(Bits 1 to 16).
Our goal was to insert a PAKIN upstream of our MCIN & CIN, which used to read 
the MDSCAN.
Below is from B0193AX - PAKIN, which reverses Bits 1 to 32 only.
PKIOPT
Packed Input Option is a short integer input that specifies whether the
input bit stream from the device is packed in the PAKCIN output parameter
with or without reversing the bit order as follows:
1 = No bit reversal (Bits 1 to 32 are mapped bit-by-bit to Bits 1 to 32)
3 = Bit reversal (Bits 1 to 32 are mapped bit-by-bit to Bits 32 to 1)

Where is 2 = Bit reversal (Bits 1 to 16 are mapped bit-by-bit to Bits 16 to 
1)????

We are trying to emulate the MCIN blocks IOMOPT = 2, which allows reversing 16 
bits.
One option we found is the IIN block to read the register directly, then 
connect to a MCIN to allow bit selection - poor use of blocks.

Thanks,

bud/



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