Eurotech Appliances zeus pxa270 Manuel D’Utilisation

 

© 2007 Eurotech Ltd    Issue D 

This is a half-duplex interface that provides combined TX and RX signals (TX+/RX+ 

and TX-/RX-). A ground connection is also required for this interface. The maximum 

cable length for this interface is the same as RS422 - 1200m (4000ft), but RS485 

supports up to 32 transmitters and receivers on a single network. Only one transmitter 

should be switched on at a time. The ZEUS uses the RTS# signal to control 

transmission. When this signal is at logic 1, the driver is switched off and data can be 

received from other devices. When the RTS# line is at logic 0, the driver is on. Any 

data transmitted from the ZEUS is automatically echoed back to the receiver. This 

enables the serial communications software to recognize that all data has been sent, 

and disable the transmitter when required. 

 

 

Only set U3_TERM# (U4_TERM#) at logic low if the ZEUS is at the end of the 

network. 

         5 

always 

 always 

 full 

5 

active RTS# 

 always 

 full 

 

3 

active RTS# 

 always 

 half