Owner`s manual

109
14.1.1 V74 & V75 DCD STATUS SELECTION
Each EIA-232 port can be configured so DCD can be an input or
output signal by positioning jumpers on the main board of the module
for each individual port. See V74 & V75 Jumper selection
layout(Figures 29 & 30 or V75 Mechanical Layout Section D.2).
A. GROUND---Pins 2 & 7 of each port are signal ground in the default
setting. This default setting is used in most data acquisition and
control applications. Locate the eight jumper locations for DCD status
selection. Jumpers (JP5,JP7,JP9, & JP11) are used to configure DCD
as an output for pin 2 for each port of the module. Jumpers
(JP6,JP8,JP10, & JP12) are used to configure DCD as an input for pin 7
for each port of the module. Each port is configured from the factory
with pins 2 and 7 as ground.
1. V75 (See Figure 29)--- Each port's jumper position for
"ground" connects the center pin and the pin located closest to the
RJ-45 connector.
2. V74 (See Figure 30)--- Each port's jumper position
for"ground" connects the center pin and the pin located on the right
with the RJ-45 connectors facing you. In both V74 and V75
applications use BayTech adapter, part number 25FRJ45PC-1 or
9FRJ45PC-1.
B. DCD "IN"---The DCD "IN" jumper selection is selected in
applications where the individual port of the V74 or V75 will be
communicating with a modem. To change the EIA-232 pin/signal
definition for a V74 or V75 port to have pin 7 configured for DCD "IN"
you must change the location JP6 for port 4, JP8 for port 3, JP10 for
port 2, or JP12 for port 1.
1. V75 (See Figure 29)---Install the two position jumper so
that it connects the center pin and the pin farthest away from the
RJ-45 port. Do not move the other jumpers.
2. V74 (See Figure 30)---Install the two position jumper so
that it connects the center pin and the pin located on the left of the
common pin with the RJ-45 port facing you. Do not move the other
jumpers. In these two applications use BayTech adapter, part
number 25FRJ45MD-4.
C. DCD "OUT"---The DCD "OUT" jumper selection is used in
applications where an individual port of the V75 will look like a modem
connection if a computer or terminal is connected to the port. Some
terminals and popular communications software packages require that
DCD is "high" for a connection to be completed. To change the EIA-