IBM 3270 Manual page 236

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Instructions for Setting 3274 Model 31C Modem, Address
~;
Switches
1. Open the customer access area door on the control panel. Insert your
finger into the recessed area to the left of the door. Pull the edge of the
door toward you, and swing it to the right.
Alt IML
Address
8 4 2 1
0000
IML
D
Poor
0 0
Insert finger in recess, and pull door to open.
2. Set the Modem Address switches on or off as indicated in the boxes
below. Press the top of the switch for on; press the bottom of the switch
for off.
Modem Address
Appendix G. Planning for 3274 Model 31C Modem Address Switch Settings
G-3