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RS422/485 SERIAL INTERFACE PLUS
NOTE
Be sure to set the address selections and jumper options before
installation.
The RS422/485 Serial Interface Plus occupies 8 consecutive I/O locations,
and looks to the PC as a standard serial port. DIP switch SW1 sets the port
address options. Be careful when selecting the port address, since some
selections conflict with existing PC ports. The following table shows the
addressing options available with the standard PAL. If you don’t see an
address option that suits your needs, call Black Box about a custom PAL
option.
Port 1 SW1 SW1 SW1 SW1
J2 1 2 3 4
Disabled ON ON ON ON
3F8 ON ON ON OFF
2F8 ON ON OFF ON
3E8 ON ON OFF OFF
2E8 ON OFF ON ON
3220 ON OFF ON OFF
3228 ON OFF OFF ON
4220 ON OFF OFF OFF
4228 OFF ON ON ON
238 OFF ON ON OFF
300 OFF ON OFF ON
308 OFF ON OFF OFF
280 OFF OFF ON ON
288 OFF OFF ON OFF
290 OFF OFF OFF ON
298 OFF OFF OFF OFF
Each COM port in your system should have a unique address. Typically
COM1: through COM4: addresses are 3F8, 2F8, 3E8, and 2E8 Hex.
3. Address Selection