Rs422 module, Rs422 connections – Matrix Orbital LK402-25 User Manual
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RS422 Module
Figure 7: RS422 Connections
Table 3: Standard Headers
#
Header
Mate
1
RS422
16-30 AWG
Wire
2
Alternate
Power
PCS
3
Keypad
KPP4x4
4
GPO
None Offered
5
Dallas
One-Wire
Temperature
Probe
The LK402-25-422 provides an industrial alternative to the standard RS232 communication protocol.
Rather than single receive and transmit lines, the RS422 model uses a differential pair for each of the
receive and transmit signals to reduce degradation and increase transmission lengths. Power can be
transmitted at distance to a -VPT module or supplied from the immediate vicinity to a regular or -V unit.
RS422 signals are available in a six pin connector as described in the RS422 Connections section.
RS422 Connections
The LK402-25-422 provides a robust RS422 interface to the display line. For this interface, a series of six
wires are usually screwed into the RS422 terminal block provided. An alternate header is also available
to provide local power to a regular or -V unit. To connect to your LK402-25-422, follow the steps below.
1. Set the Protocol Select Jumpers.
RS422: The LK402-25-422 offers only RS422 protocol and does not require any jumper changes.
2. Make the connections.
a. Screw one wire; sized 16 to 30 on the American Wire Gauge, into each of the six terminal block
positions. When local power is supplied, a floppy cable may link to the alternate power header.
b. Connect the Vcc wire to the positive terminal of your power supply and the GND terminal to
the negative or ground lead to provide appropriate power as in Table 42.
c.
Secure the A and B wires to your non-inverting and inverting output signals respectively, while
attaching the Z and Y wires to your inverting and non-inverting inputs.
3. Create.
In a PC environment, uProject or hyperterminal will serve to get you started. In addition, a
variety of application notes are also available in a number of different languages to aid in
development. Instructions for the former can be found below and the simple C# example at
is a great first reference for the latter.