IBM 3151 User Manual page 131

Reference Information (SYSTEM ATTACH)
Set/Read Control 5 Commands/Response
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Differences
Bit 5 of pa2 can be used to select the EIA RS-422A interface.
Function
Sets or reads the communication values on the main port.
Format
• Set Control 5 command
ESC $ 9 pal pa2 pa3· pa4 op
• Read Control 5 command
ESC$7
• Read Control 5 response
ESC $ 7 pal pa2 pa3 pa4 LTA
5-22
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