IBM 3270 Manual page 246

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Instructions for Setting 3274 Model 51C Modem Address
Switches
1.
Open the customer access area door on the bottom left of the Model
51C. To unlatch the door, turn the slotted screw head counterclockwise
with a coin.
0 0 0
Slotted Screw Head
(Turn counterclockwise 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.
2 3 4 5 6 7 8
This panel is located in the customer access area.
Appendix H. Planning for 327 4 Model 51 C Switch Settings
H-9