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Chapter 2 Specification of Communication port for CPU module

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2.3.4 Modem connection function

EHV-CPU is equipped with a model connection function. The model connection function can be controlled using

task codes. The setup on the Control Editor is needed to use this function.

Refer to the following table for communication specifications.

If a difference of communication speed between two operating modems, connecting between them may be difficult.

Therefore, please combine to eliminate any difference in communication speeds.

(1) Configuration

Modem Modem

RS-232C

(MAX 57.6 kbps)

Commercial line

EHV-CPU PC

Figure 2.38 Connection configuration of modem

(2) Specifications

Table 2.25 Specification for Modem connection function

Item Specification

Communication speed 2,400 bps、4,800 bps、9,600 bps、19,200 bps、38,400 bps、57,600 bps

Communication system Full duplex system (Communication program is half-duplex control.）

Synchronization system Start-stop synchronization system

Transmission system Serial transmission (Bit serial transmission)

Transmission code ASCII code

Transmission code

configuration

Stop bit (1 bit)

Parity bit (1 bit) Start bit (1 bit)

Data (7-bit)

(Even-numbered parity)

Transmission code

outgoing sequence

out from the lowest bit (20) in character units.

Error detection Vertical parity check, Overrun check, Framing check

Interface Conforms to RS-232C

Control procedure H-series dedicated procedure (High protocol)

Startup system One-side startup system by the host side command

Time out detection at

connecting modem

Sets by Control Editor

Time out detection at

communicating modem

Sets by Control Editor

* ER signal cannot be controlled. Therefore, the line is cut by commands or control by connecting the line is

needed using other I/O.

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