Motorola GM338 Service Manual download pdf (Page 15)

Mobile Radio Computer-Controlled Radio interface protocol Manual Page 15 of 24

2.5.2 GO_TO_CHANNEL

The GO_TO_CHANNEL command tells the radio to change to another

conventional mode (channel) that is part of the radio code-plug. The

specified channel can be assigned to a scan/vote group, or the

GO_TO_CHANNEL command can load a “soft-channel” in the radio,

specifying TX frequency, RX frequency. RX CTCSS frequency, TX CTCSS

frequency and channel-width (12.5, 20 or 25 kHz).

The GO_TO_CHANNEL command has the following format:

g [SIZE] [ZONE] [CHANNEL_NO] [CHECKSUM]

„g‟ is sent as a single ASCII character and represents the

GO_TO_CHANNEL command.

[ZONE] is a two-character string representing the new zone

ZONE = 02:

CHANNEL_NO is sent as two ASCII character and represents the

channel number.

Example:

Hard-channel change to channel 1: g04020172

Note If the radio is switched to a channel with scan/vote enabled, it

will adhere to the scan/vote conditions of that channel.

ZONE = 08:

Soft-channel change.

CHANNEL_NO = (txFrequency/125) (rxFrequency/125)

(txCTCSS*10) (rxCTCSS*10) 0 0

Example: g 32 08 120610 11F350 04CE 04CE 38 00000000 9F

Note: frequencies are in Hertz.

TX = 147.650 , RX = 147.050, TX CTCSS = 123 Hz,

RX CTCSS = 123 Hz, low power, 12.5 kHz channel spacing.

The source-code of a software application is available from T.L.

Parker Ltd Technical Support which will give examples of the use of

the commands and calculate the checksum for any given command

and parameters.

Please contact Technical Support (refer to “T.L. Parker Contact

Information” on page 2).

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Motorola GM338 Service Manual Page 15