DB-25 Serial Port Pinout. MCC MIIC-203

The I 2 C adapter implements the RS-232 interface using the following pins:

2.1.1 DB-25 Serial Port Pinout

DB-25 Pin 2, Transmit Data from the Host Computer to the iPort

DB-25 Pin 3, Receive Data from the iPort to the Host Computer.

DB-25 Pin 4, Request to Send from the Host Computer to iPort.

DB-25 Pin 5, Clear to Send from the iPort to the Host Computer.

DB-25 Pin 7, Ground between Host Computer and iPort

2.1.2 DB-9 Serial Port Pinout

DB-9 Pin 3, Transmit Data from the Host Computer to the iPort

DB-9 Pin 2, Receive Data from the iPort to the Host Computer.

DB-9 Pin 7, Request to Send from the Host Computer to iPort.

DB-9 Pin 8, Clear to Send from the iPort to the Host Computer.

DB-9 Pin 5, Ground between Host Computer and iPort

2.2

+5VDC Power Jack

The I 2 C adapter requires 50ma of REGULATED +5 volt power. This power can be supplied in one of two ways:

• Via the power jack.

If the I 2 C adapter is powered via its +5VDC power jack, excess power is available via the +5V wire in the I 2 C connector to power external devices.

• Via the I 2 C interface connector.

If 50ma of regulated +5V power is available in the target system, the I 2 C adapter can be powered via the +5V wire in I 2 C interface connector.

2.3

I 2 C Interface Connector

The I 2 C adapter includes a four wire, positive locking, modular receptacle connector

(see Appendix A) for interfacing to an external I

2

C Bus. Lines provided include I

2

C

Clock (SCL), I 2 C Data (SDA), Ground, and +5VDC.

Use of the +5V wire is optional. Connect this wire to the target system to power the

I 2 C adapter and the target system from a common regulated 5V power supply.

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