Honeywell XENON 1902 - Manual (Page 155)

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NEC 2 of 5 Message Length
Scan the bar codes below to change the message length. Refer to
Message Length Description (page 7-2) for additional information. Mini-
mum and Maximum lengths = 2-80. Minimum Default = 4, Maximum
Default = 80.
Minimum Message Length
Maximum Message Length