I can give you a perfectly good and logical reason why they would manufacture it with pin assignments in the order + - - +
A lot of times they will manufacture items this way so that they don't have to run two traces for the ground pins on the Printed Circuit Board (PCB) - they can just run a trace to one of them and a trace between them to tie them together. With the component density (number of components per square inch) of modern PCBs they employ any and every trick they can to reduce the number of traces per layer and the number of layers required to build the board and connect all those components.
That being the case I'd say chances are better than 75/25 that the pinout is in the order + - - + rather than + - + -
Of course you can always look at the connector on the Stylistic 1200 and find the corresponding pins and check for continuity between the second and fourth or second and third pins. I think I'll download the .pdf file and get out my trusty DMM & check it out. I'll let you know the results............