B&B Electronics RT3G-300_310_320_330_340-W - User Manual - Manual (Page 26)

B&B Electronics, Inc. SPECTRE User Manual
26
SPECTRE_User_Manual_2912m
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Connector Pinout
Fig. 24: RS485/422 connector
RS-485 Mode
Pin
number
Signal mark Description Data flow direction
1 GND Signal and supply ground
2 GND Signal and supply ground
3 TxRx- RS485 B (-) Input/Output
4 TxRx+ RS485 A (+) Input/Output
5 TxRx- RS485 B (-) Input/Output
6 TxRx+ RS485 A (+) Input/Output
7 +12 V EXT External power supply
8 +12 V EXT External power supply
Table 12: Connector Pinout in RS-485 Mode
ATTENTION! The power supply is selected on the module board using
the jumpers.
Note: In RS-485 mode, pins 3 and 5 and pins 4 and 6 are internally shorted together.
If galvanic separation is required, the converter must use an external power supply.
Fig. 25: Connection to the router with data cable length less than 10 m