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5-15. RS-232C Control Method

Signals are connected to the RS-232C connector in a

straight format as shown in Table 5-15-1 RS-232C

connection signals. This is because a crossing connec-

tion is provided inside the unit. Communication condi-

tions are set to meet the conditions given in Table 5-15-2.

Table 5-15-3 shows the command list of RS-232C.

When transmitting the command, be always sure to keep

100 ms interval between each command. Moreover, the

process time is required for a while when turning the

power ON/OFF and/or selecting the input mode. So in

such cases, also be always sure to keep enough intervals

between the commands.

Item

Communication system

Communication type

Table 5-15-2 RS-232C communication conditions

Transmission speed 9600 baud, No parity, Data length 8 bit, Stop bit: 1 bit

STX (1 byte) + CMD (3 byte) + ETX (1 byte) = 1 block

STX is 02h, ETX is 03h, CMD is command string (Uppercase character)

Table 5-15-1 RS-232C connection signals

Pin No.

Signal name

RXD

TXD

DTR

S. G

DSR

RTS

CTS

Conditions

5-9

Signal content

I/O

Receive data

Transmit data

Data terminal ready

Signal ground

Data set ready

Transmission request

Transmission enable