| 摘要 |
A point-of-sale (POS) device includes a main body and a communication module. The main body includes a main circuit for performing point-of-sale functions and an interface having a port in communication with the main circuit and a physical connection apparatus. The communication module includes a modem circuit for operating in accordance with a modem protocol and an interface. The interface of the communication module has a port in communication with the modem circuit and for connecting to the port of the interface of the main body, and a physical connection apparatus for releasably engaging with the physical connection apparatus of the interface of the main body. The interface of the communication module is configured to be complementary with the interface of the main body such that when the physical connection apparatus are engaged, the ports are connected.
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