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CJH

ASCII Woes - Tx but no Rx

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I'm trying to talk to a GDW-11 GSM modem with a Micrologix 1200 R series (2 comm ports). They're both configured for 9600. I know the modem is receiving my query because the response is substantial (tested via HyperTerminal), and the Tx light on the modem comes for significantly longer than the Rx light. However I can't get this to show up in RS Logix. When I do an ARL I get error 09h, which the help says this means "ASCII communication requested is not supported by current channel configuration." and the suggested remedy is "Configure channel 0 for DF1, Full-Duplex." The problem is that the port IS configured for DF1 Full-Duplex. (I tried ASCII and nothing works at all) Does anyone know why i'm getting this error? Thanks

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I'm getting a sinking feeling...is it perhaps because the MicroLogix's don't have a 'mode change enalbed' setting like the SLC's do?

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