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Messages - Jeff Bauman

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Technical support / Re: RTS/CTS Control
« on: June 13, 2003, 05:57:13 PM »
These are fine for "Line-of-Site" Applications.  What I'm trying to use is "Standard UHF/VHF Radios" ie: Johnson, Motorola, Maxxon 5-watt to 40-watt.  A Bell-202 modem (Required for standard radios, are typically 1200 baud max.  To communicate over a radio, you must have the rts/cts to key up the radio.  I've found a low-cost bell 202 modem by tigertronics. But without handshake it appears impossible. http://www.tigertronics.com/rtx12.htm

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Technical support / RTS/CTS Control
« on: June 11, 2003, 02:03:58 PM »
Are there any plans to enable RTS/CTS control for comm 1 ?  Can you reccomend a way to interface comm 1 with a standard VHF radio?  I have used a 5902 modem (Control Microsystems with the -m option) which controls rts/cts automatically, but it lists for $524

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Technical support / Re: ADC Jumping Around
« on: June 19, 2003, 02:24:12 PM »
So thats it? Nothing can be done about 4-20mA signal jumping around?  I'm trying to use plc for remote water tower level monitoring via a 50psi pressure transmitter with 4-20mA output, so using a pot is out of the question.  I guess I might have to try one of the RS-485 analog input modules, which puts cost of your plc above traditional units.  Any thoughts? Have you considered offering two different plc models? One for high end analog users (added cost) and maintain lower quality ADC for low end analog users?  How much more could new chip cost?

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Technical support / ADC Jumping Around
« on: June 19, 2003, 07:24:04 AM »
I'm using ADC channel 1 with a 4-20ma simulator connected to it with a 1% 250ohm resister.  The values are not steady, they move around +/- 1-2% without me changing values on simulator.  Any ideas?


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