TRANSCEIVER 400 MHz MTP700 Portable Radio / Detailed Service Manual 4.1 - 29
Side Connector
The side connector is intended to support connection to accessories such as PSM, RSM,
Headset, 2 or 4-wire data terminals and SB9600 based devices.
The side connector has 16 modes of operation as shown in Table 4.1-3.
In order to be compatible with previous generation radios, the modes of operation are
selected by applying the appropriate logic levels to the Side Option Select Pins named
SIDE_OPTION1, SIDE_OPTION2. In addition, SIDE_OPTION3 will be used to select the
other modes as per Table 4.1-3. Voltage level for SIDE_OPTION3 is per Table 4.1-4.
Table 4.1-3 Side Connector Mode Table
Mode
SIDE
OPTION1
SIDE
OPTION2
SIDE
OPTION3
1Ext PTT 0 0 V4
2Emergency 0 0 V3
3 Volume Up 0 0 V2
4 Volume Down 0 0 V1
5 Man Down 0 0 V0
6MAP27 1 0 V4
7Spare 1 0 V3
8 SB9600/SBEP 1 0 V2
9 4-Wire Data (RS232) 1 0 V1
10 2-Wire Data (RS232)
1
0V0
11 Ext Spkr 0 1 V4
12 RSM with earbud 0 1 V3
13 RSM/PSM 0 1 V2
14 User Programmable 2
01
V1
15 User Programmable1
01
V0
16 Idle
11
V4
Symbol Min Level/V Typical/V Max Level/V
V0 0 0.3 0.58
V1 0.62 0.8 0.98
V2 1.02 1.2 1.38
V3 1.42 1.6 1.78
V4 1.82 2.1 2.30
Table 4.1-4 Voltage Levels for Side Option3
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