TRS3232E-Q1: TRS3232EQPWRQ1 Part Unused channel pin connect in schematic.

Tool/software:

Hi Expert,

Greetings!!!

• We had used one of transceiver part PN# TRS3232EQPWRQ1 in the design. For schematic RS232 part signal connect followed application circuit which given in below.

Link: www.ti.com/.../tidrpr7.pdf

• Part has multichannel driver/receiver but we have used only one channel driver/receiver for the application. 
• Please guide for unused channel pin connection update in our schematic and unused channel pin number is 7 (DOUT2), 13 (RIN1), 10 (DIN2), 12 (ROUT1).

Could you please guide us for connect unused channel pins in below options.

1. Connect with direct Gnd.
2. Connect with Pullup or Pulldown.
3. Leave it as unconnected pin (Floating).