ADPRO VM22A Installation & User Manual
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Contents
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ADPRO VM22A, Issue 6 20Channel Selection For VM22 mode of operation, channel selection isProtocol achieved by application of an inverse BCD code to theExpansion I/O port (refer to Section 8.0). For VM22Aoperation, channel selection is achieved using a serialprotocol. The protocol is described in Section 9.0.Dimensions Unsealed beige coloured plastic case for indoor use.205mm x 165mm x 65mm.8.1 inches x 6.5 inches x 2.6 inches.Weight 650 grams (23 oz).Operating Conditions Operating temperature range 0 o C-50 o C (32 o F-122 o F).Humidity less than 90% non-condensing.Warranty Twenty four (24) months.7.0 BCD Codes (Fast Scan Operation)The four BCD address lines on the Expansion I/O Interface are used to select theactive channel on the VM22A when VM22 mode is selected. The following tableshows the BCD code and the corresponding channel allocation.BCD CODE(Bit 3 2 1 0)MICROPHONE/LINEINPUT NUMBERSPEAKEROUTPUT NUMBER0000 None None0001 None None0010 None None0011 None None0100 Ground None0101 Ground None0110 10 100111 9 91000 8 81001 7 71010 6 61011 5 51100 4 41101 3 31110 2 21111 1 1Table 3 – BCD Codes |
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