Filter
Top Products
21
RS-422/485 SERIAL INTERFACE PLUS, 4-PORT
Table 3-4. Jumper Functions.
Name Function
P Adds or removes the 1-Kohm pull-down resistor in the
RS-422/RS-485 receiver circuit (Receive data only).
P Adds or removes the 1-Kohm pull-up resistor in the
RS-422/RS-485 receiver circuit (Receive data only).
T Adds or removes the 120-ohm termination.
L Connects the TX- to RX- for RS-485 two-wire operation.
L Connects the TX+ to RX+ for RS-485 two-wire operation.
3.8 Clock Modes
The Serial Interface Plus Card employs a unique clocking option that allows
the user to select from divide by 4, divide by 2, and divide by 1 clocking
modes. These modes are selected at Headers J1C through J4C.
To select the baud rates commonly associated with COM: ports (2400,
4800, 9600, 19.2, and so on up to 115.2 kbps ) place the jumper in the “divide
by 4” mode (silk-screen DIV4).