XVME-976 Adapter Module
2-6
Serial Port Configuration and Connection
The RS-232C port at J2 COMB requires configuration beyond the choice of
I/O base address and interrupt described in the previous sections. The serial
port at J2 can be configured to operate as a RS-232C or RS-485 port. Jump-
ers W11 - W14 and W18 - W19 determine the functions of individual inter-
face lines on connector J2. Jumpers W15 - W17 install line terminators. Im-
plement your choice by setting jumpers
W11 - W19, according to Table 2-11.
Table 2- 11
.
COM B Serial Port Interface Jumper
W11
W12
W13
W14
W15
W16
W17
W18
W19
RS-232C
2/3
2/3
2/3
2/3
open
open
open
open
short
RS-485 Full Duplex
1/2
2/3
1/2
1/2
open
short
short
short
open
RS-485 Half Duplex
1/2
1/2
1/2
1/2
*
open
open
short
short
*Install short on W15 to terminate RS-485 signal line. RS-485 termination should be installed at the two
ends of the line.
Table 2-12.
COM B Serial Port Jumper Functions
Jumper
W11
DSR source selection
2/3
1/2
DSR from RS-232C input
Forces DSR active
W12
CTS source selection
2/3
1/2
CTS from RS-232C/RS-485 input
Forces CTS active
W14
DCD source selection
2/3
1/2
DCD from RS-232C input
Forces DCD active
W15
RS-485 RXD/TXD
termination
short
open
Terminated (120 ohms)
Unterminated
W16
RS-485 RXD
termination
short
open
Terminated (120 ohms)
Unterminated
W17
RS-485 AUXIN
termination
short
open
Terminated (120 ohms)
Unterminated
W18
J2 pin 3
short
open
Grounds COM2 pin 3
J2 pin 3 carries RS-232C TXD
W19
J2 pin 5
short
open
Grounds COM2 pin 5
J2 pin 5 carries RS-485 AUXIN+
Summary of Contents for XVME-976/202
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