User's Manual

24 LCT 450 Installation/Operation Guide 05-4819A01, Rev. 08
Invisible place holder
Figure 8. Internal Spectrum Analyzer Display
P1 CONTROL INTERFACE
Table 4 lists the pin functions on the P1 Control Interface connector.
Table 4. P1 Control Interface Pin Descriptions (DB-25)
Pin No. Description
1 No connection (NC)
2 Audio Isolated Ground
3 No connection (NC)
4 Detected Audio
5 Channel Select 3 (see Note 1).
6 RXD+ (RS-485/422 digital). Output from radio.
7 PTT Keying signal (see Note 2)
8 RXD- (RS-485/422 digital) Output from radio.
9 No connection (NC)
10 No connection (NC)