External Alarm; Accessory Connection Plan; Figure 54: Accessory Connector - Motorola MTM800 FuG Installationshandbuch

PIN Function
22 UART2_RXD / USBy_RX
23 EMERGENCY
24 UART_CTS
25 IGNITION
26

EXTERNAL ALARM

CAUTION: PIN 25: If the ignition line is not used, it must be grounded for example connected to
pin 8. Interference can cause radio to hang.
NOTICE: PINs 13 and 15 cannot be used (nor configured) at the same time.
5.2

Accessory Connection Plan

CAUTION: The accessory connections shown are not compatible to some other models of
Motorola radios. Check the appropriate accessory or technical manual for further information.
Ensure correct position of the accessory connector.

Figure 54: Accessory Connector

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Chapter 5: Connectors and PIN Assignment
Description
RS232 or UART2 RXD /
2nd USB2.0 (OTG) D-
Emergency Input (Pulled
via 24K9 to A+) – Pull
low to power on
RS232 or UART1 /
UART2 CTS input
Ignition input (through
series 15K) – Pull > 10
V to power on
External Alarm output
(Pulled via 4K7 to A+)
68015000553-KC
tomatically switched de-
pending on which accessory
is detected.
2 26
1 25
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