Monroe Electronics Electrostatic Fieldmeter - Static Monitor - model 177A - Manual (Page 47)

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Setup RS-485 Full duplex from the 177A front panel:
Press Key Display(blinking) Display Description
Program Lo Front panel Lock
Up SS System Setup
Right bAu Baud rate
Down IT Interface Type
Right +232 RS-232
Down 485 - FuL RS-485 Full duplex
Enter
Connection to the 177A: Locate the DB-9 connecter on the back of the unit; connect the four wires to the 485
bus as follows:
RS-485Bus 177A DB-9
T-  Pin1
T+  Pin9
R-  Pin2
R+  Pin3