IBM 3151 User Manual page 136

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Reference Information (SYSTEM ATTACH)
Usage Nole
The inbound and outbound pacing are disabled when DC3 is selected for the
turnaround character.
The DTR signal on the main port turns off for approximately 350 ms when either
the word length or parity is changed by the Set Control 5 command.
You can omit parameter pa2 through pa4 by specifying B'l' for bit 7 and B'O'
for bit 6 of each previous parameter .
Chapter 5. Reference Information
5-27