No adapter:

Last login: Tue Sep 24 17:33:37 on ttys000
lisahitchens@Lisas-MacBook-Pro ~ % ioreg -p IOUSB
+-o Root  <class IORegistryEntry, id 0x100000100, retain 26>
  +-o AppleUSBVHCIBCE Root Hub Simulation@80000000  <class AppleUSBRootHubDevic$
  | +-o Ambient Light Sensor@80300000  <class AppleUSBDevice, id 0x100000409, r$
  | +-o Headset@80400000  <class AppleUSBDevice, id 0x100000410, registered, ma$
  | +-o FaceTime HD Camera (Built-in)@80200000  <class AppleUSBDevice, id 0x100$
  | +-o Touch Bar Backlight@80700000  <class AppleUSBDevice, id 0x100000420, re$
  | +-o Touch Bar Display@80600000  <class AppleUSBDevice, id 0x100000424, regi$
  | +-o Apple T2 Controller@80100000  <class AppleUSBDevice, id 0x10000042f, re$
  | +-o Apple Internal Keyboard / Trackpad@80500000  <class AppleUSBDevice, id $
  +-o AppleUSBXHCI Root Hub Simulation@14000000  <class AppleUSBRootHubDevice, $
lisahitchens@Lisas-MacBook-Pro ~ %

Adapter 1 Only

Last login: Tue Sep 24 17:44:20 on ttys001
lisahitchens@Lisas-MacBook-Pro ~ % ioreg -p IOUSB
+-o Root  <class IORegistryEntry, id 0x100000100, retain 26>
  +-o AppleUSBVHCIBCE Root Hub Simulation@80000000  <class AppleUSBRootHubDevic$
  | +-o Ambient Light Sensor@80300000  <class AppleUSBDevice, id 0x100000409, r$
  | +-o Headset@80400000  <class AppleUSBDevice, id 0x100000410, registered, ma$
  | +-o FaceTime HD Camera (Built-in)@80200000  <class AppleUSBDevice, id 0x100$
  | +-o Touch Bar Backlight@80700000  <class AppleUSBDevice, id 0x100000420, re$
  | +-o Touch Bar Display@80600000  <class AppleUSBDevice, id 0x100000424, regi$
  | +-o Apple T2 Controller@80100000  <class AppleUSBDevice, id 0x10000042f, re$
  | +-o Apple Internal Keyboard / Trackpad@80500000  <class AppleUSBDevice, id $
  +-o AppleUSBXHCI Root Hub Simulation@14000000  <class AppleUSBRootHubDevice, $
    +-o USB2.0 Hub@14200000  <class AppleUSBDevice, id 0x100002dc3, registered,$
      +-o Flash Card Reader/Writer@14240000  <class AppleUSBDevice, id 0x100002$
lisahitchens@Lisas-MacBook-Pro ~ %  

Adapter 2 Only

Last login: Tue Sep 24 17:42:12 on ttys000
lisahitchens@Lisas-MacBook-Pro ~ % ioreg -p IOUSB
+-o Root  <class IORegistryEntry, id 0x100000100, retain 26>
  +-o AppleUSBVHCIBCE Root Hub Simulation@80000000  <class AppleUSBRootHubDevic$
  | +-o Ambient Light Sensor@80300000  <class AppleUSBDevice, id 0x100000409, r$
  | +-o Headset@80400000  <class AppleUSBDevice, id 0x100000410, registered, ma$
  | +-o FaceTime HD Camera (Built-in)@80200000  <class AppleUSBDevice, id 0x100$
  | +-o Touch Bar Backlight@80700000  <class AppleUSBDevice, id 0x100000420, re$
  | +-o Touch Bar Display@80600000  <class AppleUSBDevice, id 0x100000424, regi$
  | +-o Apple T2 Controller@80100000  <class AppleUSBDevice, id 0x10000042f, re$
  | +-o Apple Internal Keyboard / Trackpad@80500000  <class AppleUSBDevice, id $
  +-o AppleUSBXHCI Root Hub Simulation@14000000  <class AppleUSBRootHubDevice, $
    +-o USB2.0 HUB@14200000  <class AppleUSBDevice, id 0x100002cec, registered,$
lisahitchens@Lisas-MacBook-Pro ~ %

Adapter 2 & Laser Connected via USB Cable

Last login: Tue Sep 24 17:35:47 on ttys000
lisahitchens@Lisas-MacBook-Pro ~ % ioreg -p IOUSB
+-o Root  <class IORegistryEntry, id 0x100000100, retain 26>
  +-o AppleUSBVHCIBCE Root Hub Simulation@80000000  <class AppleUSBRootHubDevic$
  | +-o Ambient Light Sensor@80300000  <class AppleUSBDevice, id 0x100000409, r$
  | +-o Headset@80400000  <class AppleUSBDevice, id 0x100000410, registered, ma$
  | +-o FaceTime HD Camera (Built-in)@80200000  <class AppleUSBDevice, id 0x100$
  | +-o Touch Bar Backlight@80700000  <class AppleUSBDevice, id 0x100000420, re$
  | +-o Touch Bar Display@80600000  <class AppleUSBDevice, id 0x100000424, regi$
  | +-o Apple T2 Controller@80100000  <class AppleUSBDevice, id 0x10000042f, re$
  | +-o Apple Internal Keyboard / Trackpad@80500000  <class AppleUSBDevice, id $
  +-o AppleUSBXHCI Root Hub Simulation@14000000  <class AppleUSBRootHubDevice, $
    +-o USB2.0 HUB@14200000  <class AppleUSBDevice, id 0x100002cec, registered,$
      +-o USB UART-LPT@14210000  <class AppleUSBDevice, id 0x100002d00, registe$
lisahitchens@Lisas-MacBook-Pro ~ %