Data Communications - Icom IC-746 Instruction Manual

12
SETUP AND CONNECTIONS

12-7 Data communications

• When connecting to ACC(1)
Rear
panel
view
• When connecting to [MIC]
Rear
panel
view
ACC(1) PIN NO.
2
4 5
1 3
8
6 7
Rear panel
view
ACC(2) PIN NO.
2
4 5
1 3
6 7
Rear panel
view
72
A
B
2
C
4
5
D
1 3
8
6 7
E
A
F*
B
C
D
A
E
C
F*
B
1
7
E
2 8 6
D
3
5
4
F*
*When connecting the squelch line, consult the necessary manual (TNC, etc.)
NAME DESCRIPTION
1 RTTY Controls RTTY keying.
2 GND Connects to ground.
Input/output pin
3 HSEND Goes to ground when transmitting.
When grounded, transmits.
Modular input
4 MOD
Connects to a modulator
AF detector output
5 AF
Fixed regardless of [AF] position.
Squelch output.
6 SQLS Goes to ground when squelch
opens
7 13.8 V 13.8 V output when power is ON.
8 ALC ALC voltage input.
NAME DESCRIPTION
1 8 V Regulated 8 V output.
2 GND
3 HSEND
Band voltage output.
4 BAND
(Varies with amateur band)
5 ALC
Input/output pin (144 MHz only)
6 VSEND Goes to ground when transmitting.
When grounded, transmits.
7 13.8 V
The IC-746 can be connected to AMTOR/PACKET or
AFSK teletype units via the rear panel ACC sockets or
the front panel [MIC] connector. When using such units
be sure to consult the appropriate manuals.
AMTOR • PACKET
AFSK OUT
AF IN
PTT
GND
SQL IN
"HIGH" level
"LOW" level
Output current
Connected in parallel with ACC(2) pin 2.
. Ground level
(HF/50 MHz only)
Output current
Input current (Tx)
Connected in parallel with ACC(2) pin 3.
Input impedance
Input level
Output impedance
Output level
Squelch open
Squelch closed
Output current
Connected in parallel with ACC(2) pin 7.
Control voltage
Input impedance
Connected in parallel with ACC(2) pin 5.
Output voltage
Output current
Same as ACC(1) pin 2.
Same as ACC(1) pin 3.
Output voltage
Same as ACC(1) pin 8.
Ground level
Output current
Same as ACC(1) pin 7.
PC
RS-232C
cable
SPECIFICATIONS
: More than 2.4 V
: Less than 0.6 V
: Less than 2 mA
: –0.5 V to 0.8 V
: Less than 20 mA
: Less than 200 mA
: 10 k
: Approx. 100 mV rms
: 4.7 k
: 100 to 300mV rms
: Less than 0.3 V/5 mA
: More than 6.0 V/100 µA
: Max. 1 A
: –4 to 0 V
: More than 10 k
SPECIFICATIONS
: 8 V ±0.3 V
: Less than 10 mA
: 0 to 8.0 V
: –0.5 V to 0.8 V
: Less than 20 mA