Here GPS - how to check/ verify configuration settings?

I have a Here GPS installed (on a Pixhawk 2.1/ Cube).
It is connected to GPS2/ Serial4, a Here+ is connected to and configured as GPS1/ Serial3.

In order to verify the firmware version and settings, I am trying to connect the (regular) Here GPS receiver to u-center using Mission Planner’s “MAVSerial pass” option (tcp/ port 500), via Ctrl-F. The port is open and available to u-center.

(If I use this method, I get a connection to the rover module just fine and can access it in u-center.)
If I (shut down and then) disconnect the Here+ rover module and try the same procedure with the Here module, it seems that I am not getting any proper connection or live output. (The LEDs on the Here module are blinking green, so the connection to the Pixhawk seems active.)

What is unclear to me:

  1. Is it even possible to connect to the (regular) Here GPS in this manner?
  2. If not, is there any other simple way to connect this module to u-center to get said data (ideally while connected to the Pixhawk) - to verify fw status or settings?

On boot, this is the messages output:
PX4v3 00460032 33365103 36353335
Frame: HEXA
PX4: b535f974 NuttX: 1bcae90b
APM:Copter V3.5.7 (b11c6af3)
u-blox 2 HW: 00080000 SW: EXT CORE 3.01 (107900)
PX4v3 00460032 33365103 36353335
Frame: HEXA
PX4: b535f974 NuttX: 1bcae90b
APM:Copter V3.5.7 (b11c6af3)

Thanks in advance for any advice!

Is there anyone hardware savvy enough to clarify this for me with some input? Thanks in advance for lifting my fog :wink: