User's Manual

Page 131
7.2.4 Func tion of e ach te rm inal pin
TxD (input) : Inputs the transmit data.
e data.
transmit.
CTS (output) : Indicates the modem is ready-to-transmit.
When RTS is ON (Lo level), the this pin goes ON (Lo level).
.
DTR (input) : Switched the transmission mode to/from the command accept
set to ON (Lo level). When
ializing completes,
e input of RESET, this pin becomes ON (Lo level).
G D
Figure 7–2:
Functions of the pin of the serial communication connector in the direct communication
mode are as listed below.
RxD (output) : Outputs the receiv
RTS (input) : Controls the transmission and reception.
Sets to ON (Lo level) to make the modem to
DCD (input) : Not used.
DCD (output) : Indicates that the modem is receiving valid data.
While data being received, this pin is ON (Lo level)
REG24 : Sets REG24:bit 4 to output the synchronous clock
mode.
In the normal state, issuing a command,
set to OFF (Hi level).
DSR (output) : Indicates that the modem can operate. When init
after th
N (input) : Ground signal
7.2.5 T im ing
7.2.5.1 Timing cha rt of tra nsm ission and re c e ption
Timing chart of transmission and reception
Typ 13.5ms (3.5ms) Max 20us
Min 0us
Valid Data
Min 500us
Max 500us
Typ 500us
Min 500us
Valid Data
N
ote
Futaba Corporation Rev. 050415-01.1