Toshiba 386SX - Manual (Page 25)

AR-B1375/AR-B1376 User s Guide
3-7
3.2.6 Serial Port
(1) RS-232/RS-485 Select for COM-B (JP2)
JP2 select the on-board RS-232/RS-485 for COM B, if choose RS-232 connecting with CN7; if choose RS-485
connecting with J9.
JP2
RS-232C RS-485
(Factory Preset)
1 2 3 1 2 3
Figure 3-11 JP2: RS-232/RS-485 Select for COM-B
(2) RS-485 Terminator (JP7)
2
OFF
Factory Preset
JP7
1 1 2
ON
Figure 3-12 JP7: RS-485 Terminator
(3) External RS-485 Adapter Select (J6 & J7)
J6 and J7 can be set independently. J7 selects COM A port and J6 selects COM A port. J6 selects the external
RS-485 for COM B connecting with CN7. J7 selects the external RS-485 for COM A connecting with DB2.
J6 & J7
RS-232C External RS-485 Adapter
(Factory Preset)
1 2 3 1 2 3
Figure 3-13 J6 & J7: External RS-485 Adapter Select
(4) RS-485 Header (J9)
J9 is on-board RS-485 header. J9 pin assignments are as follows:
1 2 3
1 N485+
2 N485-
3 GND
J9 (COM B)
Figure 3-14 J9: RS-485 Header