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The EM500EV-MB0 motherboard comes with the EM500 module (installed on a socket). A schematic diagram of the EM500EV-MB0 board can be found on Tibbo website.
The TEV-MB0 motherboard also features the following:
•A power jack and a switching regulator with 3.3V output. This 3.3V power is supplied to the EM500 and is also provided on the interface board connector (see below).
•An MD button, which is connected to the MD input of the EM500.
•Green and red dual-function status LEDs. The term "dual-function" refers to the fact that these LEDs are also used for Ethernet link status indication.
Interface board interface
The EM500EV-IB0 RS232 interface board is connected to the EM500EV-MB0 through a 16-pin connector. Connector pin assignment is as follows:
(1) Directly connected to the corresponding pin of the EM500.