Motorola ASTRO Digital Spectra, Instruction Manual

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Installation: Accessory Connector 2
14 6881086C22-B
Notes: * indicates an active-low condition
† indicates TRC information
NC indicates Not Connected
Table 8. Accessory Connector 2 - Pin Descriptions
Pin Signal Name Description
1
RX+ (LINE1+)† Receive high used with TRC desksets (TX and RX high for two-wire operation;
RX high for four-wire operation)†
2 AUD_SHLD Ground: audio or analog
3 TX+ (LINE2+)† Transmit high used with all desksets (TX high for four-wire operation)†
4
FILT_AUD
(DET_AUD)† RX filtered audio (RX detect or discriminator audio)†
5 A+ +13.8VDC or battery voltage
6 BUSY Busy line of data bus; 5V logic
7 BUS+ High side of bus data: 180° out of phase with BUS–; 5V logic
8 UNAVAILABLE Not supported
9 VIP OUTPUT 1 Vehicle interface output port 1
10 PTT* Push-To-Talk initiates a transmission; 5V logic
11 TX– (LINE2–)† Transmit low use with all desksets (TX low for four-wire operation)†
12 DIG_GND Ground for 5V logic signals
13 VIP INPUT 1 Vehicle interface input port 1
14
RE
(SPKR_HI)† Remote deskset speaker high output (CAUTION: grounding this pin will result
in damage to the radio) (Speaker high output)†
15
REMOTE_RX–
(SPKR_LO)† Remote deskset speaker low output (CAUTION: grounding this pin will result
in damage to the radio) (Speaker low output)†
16
RX– (LINE1–)† Receive low used with TRC desksets (TX and RX low for two-wire operation, RX
low for four-wire operation)†
17 TX_AUD (AUD_TX)† Transmit audio used for telephone interconnect
18 VIP OUTPUT 3 Vehicle interface output port 3
19 BUS– Low side of bus data: 180° out of phase with BUS–; 5V logic
20 RESET Data bus reset line; 5V logic
21 5V 5V for logic circuits
22 VIP INPUT 3 Vehicle interface input port 3
23 VIP OUTPUT 2 Vehicle interface output port 2
24 MONITOR* Allows activation of monitor (used with MRTI telephone interconnect)
25 SPKR_UNMUTE Signal indicating if the Consolette is receiving valid audio