Re: [foxboro] FBM224 and port-powered modems
- From: "Johnson, Alex P \(IPS\)" <alex.johnson@xxxxxxxxxxxxxxxx>
- To: <foxboro@xxxxxxxxxxxxx>
- Date: Mon, 13 Aug 2007 10:49:17 -0400
Corey,
I checked with the hardware folks. I was told that the FBM224 modem
outputs DCD and CTS are open collector outputs sourced by 3.3V through a
1K pull up. This is probably insufficient to run a self powered modem.
Regards,
Alex Johnson
Invensys Systems, Inc.
10900 Equity Drive
Houston, TX 77041
713.329.8472 (voice)
713.329.1700 (fax)
713.329.1600 (switchboard)
alex.johnson@xxxxxxxxxxxxxxxx
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx]
On Behalf Of Corey R Clingo
Sent: Thursday, August 09, 2007 4:18 PM
To: foxboro@xxxxxxxxxxxxx
Subject: [foxboro] FBM224 and port-powered modems
Anyone ever used one of those "port-powered" modems, the ones that get =
their power from the RS-232 control signals, with an FBM224? We are =
hooking something up as a test, and have some of these on hand (Black
Box =
ME-605A fiber optic). I set the DIP switches on the TA for the "typical
modem" configuration in the FBM224 manual, but I'm not getting anywhere =
near the light power output from the modem that I should be. I tried =
opening up the switches that return signals to the FBM (CTS, DCD) but it
only improved slightly.
I hooked it up to a PC serial port and the emitted light power is
normal, =
so either I don't have some of those DIP switches set right, or the
FBM224 =
does not put out enough power on its pins to light up one of these
modems. =
I just wanted to know if anyone ever got one of these to work, and how,
before I spring for one with its own power supply.
Thanks,
Corey Clingo
BASF Corporation
=
=
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