HP gx466 Manuale Utente

42 ECM-5510 User’s Manual 
 

 

 

 

DATA+ 

11

12 

NC 

DATA- 13

14  NC 

GND 

15

16 

NC 

NC 17

18 

NC 

NC 

19

20 

NC 

 

 

DATA+/- 

This differential signal pair sends and receives serial data to the communication 

link.  The mode of this differential signal pair is controlled through the RTS 

register of Serial Port 2. Set the RTS register of the Serial Port 2 to LOW for 

transmitting, HIGH for receiving. 

Do not select a mode different from the one used by the connected peripheral, 
as this may damage CPU board and/or peripheral. 
The transmitter drivers in the port are short circuit protected by a thermal 
protection circuit. The circuit disables the drivers when the die temperature 
reaches 150 

°C. 

RS-422 mode is typically used in point to point communication. Data and 
control signal pairs should be terminated in the receiver end with a resistor 
matching the cable impedance (typical 100-120 

Ω). The resistors could be 

placed in the connector housing. 
RS-485 mode is typically used in multi drop applications, where more than 2 
units are communicating. The data and control signal pairs should be 
terminated in each end of the communication line with a resistor matching the 
cable impedance (typical 100-120 

Ω). Stubs to substations should be 

avoided.