Serial Port Driver/Receivers - Xycom XVME-976 Manual

XVME-976 Adapter Module
Jumper Group
W1 - W3
W4 - W6
W11 - W14
W18 - W19
W15 - W17
W20

Serial Port Driver/Receivers

The serial port COMA is an RS-232C port. The serial port COMB can be
configured as an RS-232C or RS-485 port. Implement your selection for this
second serial port by plugging in the appropriate driver/receiver ICs, as
shown in Table 2-3.
Interface
RS-232C
RS-485 Full Duplex
RS-485 Half Duplex
2-2
Table 2-2. Overview of Jumper Functions
Function
Port I/O address assignments
Port interrupt assignments
Enable/disable signals from the optional serial port
Terminators for RS485 lines
Enable/disable bi-directional data on the parallel
port
Figure 2-1.Connector and Jumper Locations
Table 2-3. Serial Port Driver/Receiver ICs
U10 (Max 239) U11 (75176
in
out
out
Driver/Receivers Installed
U12 (75179
out out
out
in out
U13 (75179)
out
in in
out