Digi 9XCite-PKG Manuel télécharger pdf (Page 34)

9XCite‐PKG‐R™RS‐232/485RFModem–ProductManualv2.1[2007.01.04]

©2007MaxStream,Inc. 34

Table5‐01. Bit‐wiseANDTruth

For example:Hexadecimal: 0x03 & 0x09 = 0x01

The Address Mask can be used as an additional method of facilitating communications between

modems. The Address Mask can be set to one of 65535 possible values using MK (Address Mask)

Command. The default value of the MK Parameter is 0xFFFF.

All transmitted data packets contain the Destination Address of the transmitting modem. When a

transmitted packet is received by a modem, the Destination Address of the transmitter (contained

in the packet) is logically "ANDed" (bitwise) with the Address Mask of the Receiver. If the resulting

value matches the Destination Address of the Receiver, or if it matches the Receiver Address Mask,

the packet is accepted. Otherwise, the packet is discarded.

Note:When performing this comparison, any "0" values in the Receiver Address Mask are treated as

irrelevant and are ignored.

Bit-wise AND Operation ("&")

Operand 1 & Operand 2 = Result

000

010

100

111

1 2 ... 29 30 31 32 33 34 35 36 37 38 39

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Digi 9XCite-PKG Manuel Page 34