Connect Tech Blue Heat/PCI PCI Serial Communications - Manual (Page 35)

Blue Heat/PCI User’s Manual, Connect Tech Inc.
35 Revision 0.11
Blue Heat/PCI Opto and Opto RS-422/485
The Blue Heat/PCI Opto ships with all ports jumper selectable for RS-232 or RS-422/485. The
Blue Heat/PCI Opto RS-422/485 ships with all ports RS-422/485 only. Both the Blue Heat/PCI
Opto and the Blue Heat/PCI Opto RS-422/485 offer full RS-422/485 support in hardware with
three modes: Full Duplex, Half Duplex, and Multi-drop Slave. You enable these modes via
software. See the
readme files for each operating system concerning details on how to enable the
different modes
Electrical Interface Selection
The Blue Heat/PCI Opto adapter provides jumper selectable RS-232 and RS-422/485 electrical
interfaces on each port.
Note:
Blue Heat/PCI Opto RS-422/485 adapters provide only an
RS-422/485 electrical interface on each port. Jumper blocks
J2, J3, J4 and J5 are not present, so therefore please
disregard the following interface selection examples for Blue
Heat/PCI Opto RS-422/485 adapters
Jumper blocks J2, J3, J4 and J5 set the electrical interfaces for the individual ports, with J2 for
Port 1, J3 for Port 2, J4 for Port 3, and J5 for Port 4. Jumpers installed on J2, J3, J4 and J5
enable the RS-232 interface for that port, while jumpers not installed enable the RS-422/485
interface for that port. Figure 6 depicts the locations of jumper blocks J2, J3, J4 and J5.
Example 1:
This example shows the
settings on J2 and J3 jumper
blocks so that port 1 is set for
RS-422/485 and port 2 is set
for RS-232. Example 2:
This example shows the
settings on J2, J3, J4 and J5
jumper blocks so that ports 1,
2 are set for RS-232 and
ports 3, 4 are set for
RS-422/485.
J2
J3
COM1
COM2
COM1
COM2
COM3
COM4
J2
J3
J4
J5
Technical Note:
You can set up the RS-232 serial ports to run at up to 230.4
Kbps, but you must use good quality cables to maintain high
baud rates over longer distances.
Full Duplex Mode
In this mode, TxD & RxD are active all the time. This mode is typically used in point to point
situations much like RS-232.