Datalink Systems i50 Dokumentacja Pobierz pdf (Strona 12)

i50 Manual (5.10)

Page 12

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4.5 COM Connectors

The i50 has three external DB-9 serial connections: COM1, COM2 and COM3. These all use RS-232

voltage levels, with ESD protection.

4.5.1 Automatic Shutdown (i50 hardware versions < 3)

The COM2 and COM3 ports will not automatically wake up until a valid external RS-232 signal is

present. Once awake, the ports will shut down immediately when all RS-232 signals have been

removed. Note: because COM3 shares some lines with the internal Iridium modem, it will always stay

awake while the Iridium modem is enabled (requires internal Iridium modem to be installed).

Important note for Garmin users: newer NUVI devices also keep their serial ports turned off

until valid signals are detected. Because of this, they will not work correctly with the i50’s

COM2 port. The COM3 port will only work with these devices if an internal Iridium modem is

present and enabled. The same applies to any external devices that power down their ports

when no signal is detected, such as many RS-485 converters.

I50 version 3 hardware automatically enables the COM2 and COM3 ports while it is awake, and

disables them when sleeping.

4.5.2 COM1

COM1 has a female connector, through which the i50 acts as a DCE (data communication

equipment). This is intended for connection to a PC or other terminal, but can be used for any

purpose. See Table 3 for pin descriptions.

DB-9 Pin (female)

Pin Name

Direction (relative to i50)

DCD

Output

Input

DTR

Input

GND

DSR

Output (always high) / VOUT*

RTS

Input

CTS

Output

Table 3 – COM1 Connector

Note: the COM1 DSR pin is always active (high) when COM1 is enabled (hardware version < 3).

COM1 is turned on and off by the i50, based on the Port A route setting. The port is enabled when

Port A is routed to COM1, and disabled when Port A is routed to the program connector or internal

Wi-Fi.

* In i50 hardware version 3, the COM1 DSR line is connected internally to the VOUT signal.

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