Westermo GD-01 - Manual (Page 69)

69 6196-2220
In text mode <vp> is only coded in “relative” format.The default value is 167
(24 hours).
This means that one octet can describe different values:
VP value Validity period value
0 to 143 (VP + 1) x 5 minutes (up to 12 hours)
144 to 167 12 hours + ( (VP – 143) x 30 minutes )
168 to 196 (VP – 166) x 1 day
197 to 255 (VP – 192) x 1 week
<pid>
is used to indicate the higher layer protocol being used or indicates interworking with
a certain type of telematic device. For example, 0x22 is for group 3 telefax, 0x24 is for
voice telephone, 0x25 is for ERMES. <dcs> is used to determine the way the information
is encoded. Compressed text is not supported. Only GSM default alphabet, 8 bit data and
UCS2 alphabet are supported.
B A C K