Transmission Procedure; Interface; Wiring - Omron ZEN-8E Communications Manual

■ Transmission Procedure

Host computer
ZEN

■ Interface

■ Wiring

When the host computer transmits a command frame, the ZEN
transmits a response frame that corresponds to the command frame. A
single response frame is returned for each command frame. The
following diagram shows the operation of the command and response
frames.
Command frame
Note: Allow a wait time of at least 2 ms before the next command is
sent after the host computer receives a response from the ZEN.
Use of the following Converter for RS-232C and RS-485 interface
conversion is recommended.
Name
Interface Con- K3SC
verter (OMRON)
This section explains how to perform the ZEN's communications wiring.
For details on the host computer, refer to the user documentation
provided with the host computer.
• Match the communications specifications of the ZEN and the host
computer.
• The connection format can be either one-to-one or one-to-N.
• Up to 32 units including the host computer can be connected in a one-
to-N system.
• The total cable length is 500 m max.
• Use a shielded twisted-pair cable with wires of a thickness of AWG28 to
AWG14 for communications signal wiring.
Note: When using a 1:N connection, set the same communications
specifications in all of the Units, and set a unique node number
for each Unit.
1.1 Overview of Communications Methods
Command frame
Response frame
Model Details
Communications between the host computer
and the ZEN conform to the RS-485 interface.
3