Specifications

MODEM 158
3. SERIAL INTERFACE PIN ASSIGNMENTS
PIN
NO.
DC-150
SIGNAL
PIN NO. MODEM SIGNAL
1 DTR 1 FG
2 S_GND 2 RXD
3 DSR 3 TXD
4 RXD 4 CTS
5 TXD 5 RTS
6 CTS 6 DTR
7 RTS 7 SG
20 DSR
CONNECTOR AT DC-150 SIDE : 8PIN DIN
CONNECTOR AT MODEM SIDE :25PIN D-SUB
4. TRANSMISSION CONTROL
4-1. DC-150 ↔ MODEM CONTROL ( DEFAULT SETTING, TRANSMITTING
DIAL COMMAND, DISCONNECTING DIAL CONNECTION)
AT COMMAND SET
4-2. DC-150 ↔ DC-150 (AFTER DIAL CONNECTION)
CONTROL CHARACTER
STX (02H)
START TEXT
ETX (03H)
END TEXT
EOT(04H)
START
TRANSMISSION
ENK (05H)
END TRANSMISSION
ACK (06H)
POSITIVE RESPONSE
NAK (15H)
NEGATIVE
RESPONSE