Icom IC-746 - What Are the Pin-Outs on the ACC-1 Connector

IC-746 FAQ
8.4 What are the pin-outs on the ACC-1 connector?
Page 72 of the Instruction Manual has the full scoop. Here is a brief description.
1 RTTY High > 2.4 V dc
Low < 0.8 V dc
Current < 2 ma
2 GND
3 HSEND Input/Output for HF-6m
When grounded, transmits
Goes to ground when transmitting
Ground level: -0.5 to 0.8 V dc
Output current: < 20 ma
Input current: < 200 ma
4 MOD Audio input - direct to modulator
Bypasses microphone preamp and VOX
100 mV rms at 10,000 ohms
5 AF Audio output - fixed level
Also monitor output when transmitting
100-300 mV rms at 4,700 ohms
6 SQLS Goes to ground when squelch opens
Current: 0.1 ma
7 13.8 V Unregulated connection to main supply voltage
Max Current: 1 amp
8 ALC Automatic Level Control
0 to -4 V dc yields 0 to 100 w RF output
Page 91 of 113
2003-02-08