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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
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
Transmit Data, Receive Data, and Ground are required in all cases.
Request to Send and Clear to Send are required if RTS/CTS communication
handshaking protocol is selected. See the iPort/AFM Flow Control
command.
Communication Handshaking Protocol
iPort/AFM implements either XON/XOFF (by default) or RTS/CTS flow
control protocols. Either protocol can be selected with the iPort/AFM Flow
Control command. Flow control is used by the iPort/AFM to limit character
flow to and from the Host computer to avoid overflowing internal
communication buffers and lost data.
Communication Parameters
19,200, 57.6k, or 115.2k Baud, No Parity, 8 Data Bits, 1 Stop Bit
The default baud rate is 19,200 until the iPort/AFM receives a Baud Change
command from the host computer.
2. +5VDC Power Jack
The iPort/AFM Host Adapter can be powered in one of two ways, from the
power jack, or from the I
2
C interface connector. If the unit is powered from
the provided +5VDC Wall Transformer, approximately 250ma of regulated
+5VDC is available at the I
2
C interface connector to power external devices.
If the iPort/AFM is powered from the I
2
C connector, the unit requires 50ma
of regulated +5VDC.