Sony ILCE-7RM2 How To Use Manual page 223

Menu item details
On:
Time code is output to other devices.
Off:
Time code is not output to other devices.
Note
When [ TC Output] is set to [On], the image may not be output properly to
the TV or recording device. In such cases, set [
[220] How to Use
REC Control (movie)
If you connect the camera to an external recorder/player, you can remotely
command the recorder/player to start/stop recording using the camera.
1. MENU →
setting.
Menu item details
On:
The camera can send a recording command to an external
recorder/player.
The camera is sending a recording command to an external
recorder/player.
Off:
The camera is not able to send a command to an external recorder/player to
start/stop recording.
Note
Available for external recorders/players compatible with [
When [ TC Output] is [Off], [
Even when
properly depending on the settings or status of the recorder/player. Check if
Changing settings
(Setup) → [HDMI Settings] → [
is displayed, the external recorder/player may not work
TC Output] to [Off].
Setup menu
REC Control] is set to [Off].
REC Control] → desired
REC Control].