IDV State Channel Plotting

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I have several dynamic cases run using IDV files, and I want to add output channels for renewable machine dynamic models. I know how to do this with Python.

psspy.state_channel([-1,state index],r"""name""")

However, when I attempt to do this with batch syntax and add it to my IDV file, I get an error message.

Example syntax for adding state channel index 3 to first available channel:

BAT_STATE_CHANNEL,-1,3,'REGC_s0_Ip'

The error message I receive is:

*** Command not recognized: BAT_STATE_CH
BAT_STATE_CHANNEL,-1,3,'REGC_s0_Ip'

I am using PSSE 36.0.1. Is my syntax wrong? Thanks!