Wiring; Communications Parameters - Omron KM50 Communications Manual

Section 1 Overview

■ Wiring

● RS-485
• The connection configuration is 1:1 or 1:N. For a 1:N configuration, up to 31 KM50-C/-E nodes
can be connected for CompoWay/F and up to 99 KM50-C/-E nodes can be connected for
Modbus.
The host (e.g., computer) is not counted as a node for these limits.
• The maximum total cable length is 500 m.
• Use shielded twisted-pair cables with wires of AWG24 to AWG14 (cross-sectional areas of 0.205
2
to 2.081 mm ).
• Terminating resistance must be connected to the nodes at the ends of the transmission path
(including the host).
Use a terminating resistance of 120 Ω (1/2 W) at each end.
The communications specifications of the host must match those of the KM50-C/-E. For a 1:N
configuration, the communications specifications of all nodes must match. Each node, however,
must have a unique communications unit number. This manual describes how to set the
communications specifications for the KM50-C/-E. Refer to user documentation for your host to set
the host communications specifications.

■ Communications Parameters

The communications specifications for the KM50-C/-E are set in Communications Setting Mode.
The following table lists the communications parameters and set values.
Parameter
Communications Protocol
Unit Number
Baud Rate
Data Length
Stop Bits
Vertical Parity
Transmission Wait Time
1-4
Set values
CompoWay/F or Modbus
00 to 99
1.2, 4.8, 9.6, 19.2, or 38. 4 (kbits/s)
7 or 8 (bits)
1 or 2 (bits)
Even, odd, or none
00 to 99 (ms)
Default setting
CompoWay/F
01
9.6 (kbits/s)
7 (bits)
2 (bits)
Even
20 (ms)