S4 dip-switch auto retrain control, S4 dip-switch data compression control, S4 dip-switch dcd, dtr and dsr control – Westermo TR-36B User Manual
Page 14: S4 dip-switch set modem to factory default, S4 dip-switch line mode setting

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S4 DIP-switch
Auto retrain control
ON
1 2 3 4 5 6 7 8
Use stored values
ON
1 2 3 4 5 6 7 8
Auto retrain disabled (AT%E0)
S4 DIP-switch
Data compression control
ON
1 2 3 4 5 6 7 8
Use stored values
ON
1 2 3 4 5 6 7 8
Data compression disabled
(AT%C0)
S4 DIP-switch
DCD, DTR and DSR control
ON
1 2 3 4 5 6 7 8
Use stored values
ON
1 2 3 4 5 6 7 8
DCD and DSR always on,
DTR ignored (AT&C0&D0&S0)
S4 DIP-switch
Set modem to factory default
ON
1 2 3 4 5 6 7 8
Use stored values
ON
1 2 3 4 5 6 7 8
Restore factory default setting*
Don’t leave S4:1 in ON position if not intended to restore factory setting at every power on.
ON
1 2 3 4 5 6 7 8
Use stored values
ON
1 2 3 4 5 6 7 8
Reliable mode enable (AT\N2)
ON
1 2 3 4 5 6 7 8
Buffer mode enabled (AT\N0)
S4 DIP-switch
Line mode setting
ON
1 2 3 4 5 6 7 8
Direct Mode enabled (AT\N1)