GAI-Tronics ICP9000 Navigator Series Console Installation and Service Manual - Manual (Page 54)

Features and Options ICP9000 Navigator Installation and Service Manual
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Positive Mode Control/Secure
The Positive Mode Control feature is used to control a secure-equipped base station. In this modified
tone-control scheme, there are two function tones present in any tone sequence that causes the radio to
transmit. Immediately following the high level guard tone, there is a coded/clear function tone that
instructs the radio equipment whether or not voice audio is to be encrypted. The normal transmit function
tone follows the coded/clear function tone.
Up to four Console Interface Units (CIUs) can be connected to and controlled by the ICP9000 Navigator
MCU through the I/O pins of the RS-232 & I/O. These pins are assigned automatically to channels that
have secure operation enabled via the CARD Suite Software.
The assignment is made in the order of the channels programmed: That is, the first secure channel from
channel 1 to 12 will have I/O pins 7 and 12 assigned, the second secure channel will have I/O pins 8 and
15 assigned to it. This continues until all four pairs of CIU I/O connections have been used. Any other
secure channels are not assigned I/O pins. Refer to Table 14 for pinout information in connecting the
CIU to the MCU. Refer to Table 14 for pinout information in connecting the CIU to the MCU.
Table 13. CIU Pin Connection
Pin No. Pin Function Description
P912-8 Clear PTT Input to CIU instructs either a clear/coded signal to be sent.
P912-11 RCV DVP Output from CIU indicates receive audio was decrypted.
Table 14. RS-232 & I/O – DB15 Male Connector
Pin No. Pin Function Asserted State
1 Encode control IN 4 Indicates that receive audio on CIU 4 is coded
2 Encode control IN 3 Indicates that receive audio on CIU 3 is coded
3 Encode control OUT 3 Instructs CIU 3 to transmit in the clear mode
4 Encode control OUT 4 Instructs CIU 4 to transmit in the clear mode
5 General Purpose I/O 2
6 General Purpose I/O 1
7 Encode control OUT 1 Instructs CIU 1 to transmit in the clear mode
8 Encode control OUT 2 Instructs CIU 2 to transmit in the clear mode
12 Encode control IN 1 Indicates that receive audio on CIU 1 is coded
15 Encode control IN 2 Indicates that receive audio on CIU 2 is coded