To Next Page

To Previous Page

Overview

1.1 Overview of Communications Methods

1-3

■ Communications Specifications

Note 1: RS-232C is supported by E5AN, E5EN, and E5GN only.

Note 2: Communications baud rate, data length, stop bits and vertical

parity can each be set independently in the communications

setting level. Highlighted values indicate default settings.

Note 3: The communications data length for Modbus must be 8 bits.

■ Transmission Procedure

When the host transmits a command frame, the E5CN/AN/EN/GN

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.

Transmission line connection RS-485: Multidrop

RS-232C: Point-to-point

Communications method (See note 1.) RS-485 (2-wire, half-duplex)/RS-232C

Synchronization method Start-stop synchronization

Communications baud rate (See note 2.) 1,200, 2,400, 4,800, 9,600, 19,200, 38,400 or 57,600 bps

Communications code ASCII

Communications data length (See notes

2 and 3.)

7 or 8 bits

Communications stop bits (See note 2.) 1 or 2 bits

Error detection Vertical parity (none, even, or odd) (See note 2.)

FCS (Frame Check Sequence) with SYSWAY communications

BCC (Block Check Character) with CompoWay/F communications

CRC-16 (Cyclic Redundancy Check 16) with Modbus communications

Flow control None

Interface RS-485/RS-232C

Retry function None

Communications buffer 217 bytes

Send data wait time 0 to 99 ms, default time: 20 ms

E5CN/AN/EN/GN

Command frame

Response frame

Host

Allow a wait time of at least 2 ms before the next command is sent after the host

receives a response from the E5CN/AN/EN/GN.

Omron E5AN Communications Manual

Other manuals for Omron E5AN