a field spans multiple octets the lowest numbered bit of the field in the highest numbered octet containing the field represents the least significant bit 2 0 the order of the bit values within each octet increases as the bit number increases the order of the bit values from octet to octet increases as the octet number decreases fig7 illustrates a field which spans two octets an exception to this convention is the frame check sequence fcs field which spans two octets in this case the order of the bit values within the octets is reversed that is bit 1 of the first octet is the msb and bit 8 of the second octet is the lsb see fig8 messages of the instant invention use the frame structure shown in fig9 messages start and end with a standard hdlc flag octet 01111110 2 as defined in iso iec 3309 the frame check sequence fcs field is defined in iso iec 3309 transparency using the octet stuffing method is defined in iso iec 3309 the message information field consists of three components an identification field i followed by a standard information field s and an optional non standard information field ns the general structure of the message information field is shown in fig1 in both the identification i and the standard information s fields most of the information to be conveyed consists of parameters relating to particular modes features or capabilities associated with the two stations in order to encode these parameters in accordance with a consistent set of rules and allow.