Here is a drawing. Note the center 4 pins. Recently here switched over to using the 4 wire RJ-11 jacks which only fit in one way do 4 pin connections as the default HAI cables are using RJ-12 jacks and 6 wire flat cable.
On one port I am using a Zigbee ZIM here which utilizes the RS-485 jumper and 12VDC to supply power to the ZIM.
I just googled a close up picture. Note that all of the jumpers on this board / picture are to the left which is the default position. Note too that in this picture an RJ11 jack and cable are being utilized.
In this picture an RJ12 (6PIN) jack and cable are being used.
Here utilize UPB (4 pin), ZWave (4 pin), Zigbee (6 pin), Russound (4 pin), Serial to PC (4 pin) and X10 (4 pin).
The serial to pc connection works fine with PCA.
For the SA PIM with an RS-232 port on it - you can utilize a standard HAI RJ to Serial plug (9 pin)
This is the same cable I use for the Russound zoned audio box.
For the HAI PIM RJ to RJ it is just a flat 6 pin cable with RJ12's on each end which you can crimp easy like.
Looking at my cable this morning the RJ11 tab is on the same side as the little line on the RJ11 cable.