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Chapter 2 Specification of Communication port for CPU module

2 – 47

Table 2.26 List of signals for Serial communication port at connecting modem

Direction Meaning

Pin No.

Signal

abbreviation

CPU Modem

1] SG1 Grand for signal

2] CD1 Notification signal during carrier received. Connects to CD in the modem.

3] ER1 Communication enable signal of the terminal

4] ER2 Unused

5] SD1 Data transmitted by CPU. Connects to SD in the modem.

6] RD1 Data received by CPU. Connects to RD in the modem.

7] DR1 Communication enable signal of the modem. Connects to DR in the modem.

8] RS1 Transmission request signal. Connects to RS in the model.

(3) AT command

AT command is used for setting various setup of a modem and set using the host computer. EHV-CPU generates

the AT command for the initial setting automatically. The AT command is not used for other purpose.

Refer to the instruction manual of the modem maker for the AT command.

In AT commands, an instruction transmitted to the modem from the host is called “command” and the character

string in response to the “command” returned to the host from the mode is called “result code”.

At commands always begins the character string “AT” and a return code is input at the end of the command.

However, A/ is excluded. The command that follows the “AT” can have multiple inputs in a single line.

Example)

AT command

A T CR LF &C 1 &S 0 P 2

CD signal: depends

on the carrier of

counter-party

DR signal: always ON 20pps (Pulse setting)

(A) Format

[1] AT command format

A T CR LF

Command Parameter Command Parameter …

[2] Result code format

CR LF CR LFResult code (word)

CR LFResult code (number)

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RTS WM300 Especificaciones Pagina 61