DEC VT1300 (VXT1300) manual around

I have looked through bitsavers and some other old vax manual repositories online and I haven't found a manual for the DEC VT1300. I did an installation and service manual for the VR320 monitors I have, but they only cover the display. I have worked out alot of details about the vt1300 system, and have gotten one working 100%, but haven't figured out what terminal emulation the terminal personality of the unit uses. It works 95% with the vax 3900 I have it attached to, but from time to time I see what I assume as vt100 control codes in the output stream. I assumed that that unit used vt100 emulation out of the box, and that the vax console would go this way as well, but perhaps I'm wrong. It could be that the vax is vt52 some other terminal type by default, or that the 1300 does vt102, or vt220...