User's Manual

3-4
3-3. REMOTE OPERATION
The Remote Control Unit (RCU) shown in Figure 3-1 can either be a personal computer or it can
be a Remote Terminal Unit (a handset, or a control head connected by a cable of up to 250 ft).
As shown, the RCU is connected in a master/slave relationship to the transceiver and the RCU
always initiates a given command. All commands are sent as a series of ASCII characters over
the RS232 connection.
RCU RADIO
(MASTER) (SLAVE)
Figure 3-1. Remote-Control Unit
When first powered up, the RCU sends an ID interrogation code to query what type of radio it is
connected to (what options have been attached). Given this information, the RCU restricts the
type of commands that it can transmit to the transceiver. When the remote command is
recognized by the transceiver as a valid command, the transceiver will enter into the slave mode
(the RCU is the master with the transceiver as the slave). The transceiver will also lock out all
local keyboard inputs (except for the Release Remote Key Sequence, RRKS: [Mode] [R/T])
allowing all commands to come from the RCU.
3-3.1. REMOTE CONTROL INTERCONNECT
3-3.1.1 X-mode Connector
The X-mode pins used for remote-control of the transceiver are:
Pin
# Description
S Remote Data Out (ASCII data from the transceiver)
a Remote Data In (ASCII data to the transceiver)
A Ground
3-3.1.2 Data Rates and Logic Levels
If using HyperTerminal, configure as shown.