Datalink Systems i50 Especificações descarregar pdf (Página 13)

i50 Manual (5.10)

Page 13

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4.5.3 COM2/COM3

COM2 and COM3 use male connectors, through which the i50 acts as DTE (data terminal

equipment). These ports are intended to connect to external modems, but may also be used for other

purposes.

COM2 provides most handshaking and control pins, allowing full control of external devices and

hardware flow control to prevent data loss. Table 4 shows the COM2 pin descriptions.

DB-9 Pin (male)

Pin Name

Direction (relative to i50)

DCD

Input

Output

DTR

Output / VOUT*

GND

DSR

Input (ignored)

RTS

Output

CTS

Input

Table 4 – COM2 Connector

Note: the COM2 DSR pin is ignored by the CPU.

COM3 uses a three-wire interface, so is unable to support hardware handshaking. Table 5 shows the

COM3 pin descriptions.

DB-9 Pin (male)

Pin Name

Direction (relative to i50)

Not used

Input

Output

DTR

Output (always high) / VOUT*

GND

Not used

RTS

Output (always high)

Not used

VOUT

Factory Option

Table 5 – COM3 Connector

Note: the COM3 DTR and RTS pins are always active (high) when COM3 is awake. This allows

attached devices to communicate if they are expecting these signals to be present.

COM3 pin 9 can be modified at the factory to provide a VOUT source. See section 4.2 for more

information.

* In i50 hardware version 3, the COM2 and COM3 DTR lines are connected internally to the VOUT

signal.

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