Omega Engineering DIN-190 - Manual (Page 6)

5 DIN-191 & DIN-192 USERS MANUAL
The DIN-191 female RS-232 connector utilizes five connections:
Transmit
pin 2
Receive pin 3.
Ground pin 5.
Data Set Ready (DSR) pin 6
Clear To Send (CTS) pin 8
Both the Data Set Ready (DSR) input pin #6 and Clear To Send (CTS)
input pin #8 are internally biased to their active state thru a 330
Ω
resistor
to +5Vdc.
To easily connect to any host PC computer, a straight thru RS-232 cable
can be used. The RS-232 input Ground and signals are isolated by up to
500VRMS from the power supply ground. Cable CA-1 is a male-to-male
DB-9 communications cable available for purchase from us.
Figure 1A Connections for DIN-191.
An RS-485 repeater is necessary to extend the length of an RS-485
network, or connect more than 32 RS-485 devices on an RS-485
network.
The DIN-192 repeater contains a seven-pin screw terminal plug. The pin
designations are located on the label of each module. The screw
terminals will accept up to #14 gauge wire (AWG). This connector is used
for +5.0Vdc regulated power supply input and both pairs of RS-485 data
lines. The isolated RS-485 input data lines are clearly marked and their
ground reference is isolated by up to 500VRMS from the power supply
ground. The isolated RS-485 input data lines should be attached to the
end of an existing RS-485 network. The serial data received on the