In all cases the interface cable will be some variety of a NULL MODEM scheme. Depending on the selection of MODES 10 or 11, user may have to cut and jumper to make the system operate. To work all this out do this test:
Now the nuts and bolts. If you are using MODE 10, the 310 will demand that its pin 5 be at a logic 0 (0 volts) else the unit will not transmit. Under normal circumstances pin 5 measures about +5V relative to the digital ground. This is equivalent to condition 3 above. The unit simply ingores the print command.
In cabling, at the X-Rite end, jumper pin 5 to pin 7. Do not attach pin 5 to the distant PC. This will enable the print mode by dropping the signal to logic 0 at the X-Rite end.
If you are using MODE 11 the 310 will demand that its pin 5 be at a logic 1 (+5 volts). Generally speaking a standard NULL MODEM cable will assure this as the appropriate logic signal will be borrowed from the PC. In the above scenario (where no cable is attached) the unit will simply freeze (condition 2 above). If attaching a cable and executing the desired software does not remedy the problem, it can be solved by yet another cable patch.
In cabling, at the X-Rite end, jumper pin 5 to pin 20. Do not attach pin 5 to the distant PC. Pin 20 always carries a +5V signal and will thus bring pin 5 to the required level.
One of the above scenarios will get the 310 transmitting.