Pinouts - 309, 310, 320, 361, 810, 811

With the exception of the 820 and 830, all X-Rite "Large" transmission chassis are wired the same. They are equipped with RS232-C compatible DB25s connectors. Pinouts follow:
 Pin # FunctionNotes:
 2 TransmitTXD, data transmitted from the densitometer
 3 ReceiveRXD, data received by the densitometer
 5 CTSClear to Send, controls output from densitometer
 7 GroundDigital ground
 20 DTRData Terminal Ready, controls input to densitometer

Note: Lines 4 and 5 are internally connected.

In general terms, connection of these instruments to IBM compatible computers is via a NULL-MODEM type interface. In NULL-MODEM interfaces, several pairs of wires are crossed so that the receive line of one device is attached to the transmit line of the other. Handshake lines too must be crossed if hardware flow control is to be initiated.

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