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VX-4000 UHF Service Manual
Pin 15: IGN
[Ignition Sense feature]
The VX-4000 may automatically be switched to
the STAND-BY mode when the vehicle's igni-tion
key is turned on.
Maximum current is 20 mA.
This feature is only enabled on transceivers con-
figured for Dual Deck operation.
Pin 16: NC
[NO connection]
Pin 17: AFO
[Digital Output for DATA Communications]
m
RX Hi-speed Data Output Type (jumper
JP2004). output level 600 mV/10k Ohms
m
RX Low-speed Data Output Type (jumper
JP2005). output level 200 mV/600 Ohms
If the Jumper setting is “Low-speed Data” (JP2007
jumpered), this port is usable in the AUDIO
(300~3000 Hz) range.
If the jumper setting is “HI-speed Data” (JP2006
jumpered), this port is usable for 9600 bps DATA
communications, because the filter and limiter are
not engaged in the Audio line.
Pin 18: E
[GND]
Ground for all logic levels and power supply re-
turn.
Pin 19: NC
[No Connection]
Pins 20, 21, & 22: AO1, AO3 & AO4
[Universal Output Port]
LOGIC level (+5V / 0V) output.
The logic output appears at these pins when the
front panel's PF key is turned on.
The possible programming features (use CE35)
are illustrated below.
If the HA feature is assigned to these ports, a cur-
rent amplifier must be connected between the
Horn circuit and the port.
A KEY
/
B KEY
/
C KEY
/
D KEY
/
E KEY
/
HA
/
Invert
Pin 23: SQ
[Squelch Signal Output]
Open collector output. Max. sink current 10 mA.
A Signal is present (Squelch is open): Level High
No Signal is present (Squelch is closed): Open
When you connect the solder jumper on J2002,
this port changes to PULL UP (5 V) output.
This status can be changed by CE35 programmer.
Pin 24: SPM
[Speaker Mute Output]
Open collector output.
External Speaker mute on: Level High
External Speaker mute off: Open
Pin 25: ME
[GND]
Chassis ground.
Ignition 13.8V
DSUB 25-Pin
