Siebert SX202 Série Manuel D'utilisation page 35

If the display should not send a protocol reply (normal case), application example A
applies for activating one or more displays.
If a protocol reply is expected, a differentiation has to be made whether one single
unit or more units are to be activated. If one single unit is activated, application
example B is valid.
If several units are to be activated, a bus wiring is necessary. You have to
differentiate, if a 4-wire bus (full-duplex) or a 2-wire bus (half-duplex) is used.
Application example C applies for 4-wire bus and application example D applies for
2-wire bus.
Application example A
Application example B
BAL SX202 SER M 1.0
Setting in menu item 1: RS485
Setting in menu item 6: no protocol answer
Setting in menu item 1: RS485
Setting in menu item 6: ACK/NAK (recommended)
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