Introduction
SRL-35 Special Features
4
SRL-35 Operator’s Manual
P/N: 1003224-01
The power cable (+V
b
and GND) must be connected to a power supply with a proper output voltage
(+9…+16
V
DC
) and with a minimum output current of 15A.
Basic settings for the serial port of the host computer, when using a terminal program (TRU) to
communicate with the SRL-35 radio modem, are as follows: “COM1, 9600 bps, 8-bit data, none parity, 1
stop bit”.
If the serial port designated as COM1 in the host computer is reserved, any other free serial port in the host
computer can be used (with the settings listed).
SRL-35 Special Features
Call Sign
The SRL-35 has a CALL SIGN identifier feature required in some countries. A call sign can be formally
assigned by a government agency, informally adopted by individuals or organizations, or even
cryptographically encoded to disguise identity of a station.
A call sign is an FCC (in US) or other regulatory authority assigned identifier that is issued along with the
license for operating a radio modem. This field is for entering your call sign. The modem automatically
broadcasts the specified call sign periodically. If this field is empty, there is no call sign information.
Call sign can be transmitted using Topcon Receiver Utility (TRU). Advanced call sign setup can be found in
Program menu clause Radio settings and further in its sub clause Call sign. Refer to the Settings chapter for
detail on TRU and Program menu. Call sign has three (3) different setups. With Call Sign Mode you can set
Morse code transmission ON or OFF. Call Sign ID defines which Morse code will be transmitted. Only capital
letters and numbers are allowed. If the digits are wrong kind, there will be message: Value error. Small
letters will be converted to capital letters automatically. If Call Sign ID field remains empty, the Call Sign
transmission will not be activated. Call Sign Timer is the transmission delay of Morse codes. Minimum and
default transmission time is 15 minutes.
During Call sign transmission the CTS-line of the modem is not in active state. This is to inform terminal
equipment that the modem is not ready to neither receive data from serial port nor forward it. The modem
deletes all data (also SL commands), which has arrived to serial port during call sign transmission. Call sign
transmission lasts 1-4 seconds depending on the number of digits.
Error check
OFF
ON/OFF
Repeater
OFF
ON/OFF
SL-commands
ON
ON/OFF
Priority
TX
RX/TX
FullCR16 Check
OFF
ON/OFF
Routing
OFF
ON/OFF
Tests
OFF
ON/OFF
Table 6. Default Settings
Terms “PCC”, “PacCrest”, and “PDL” are used interchangeably in this document as well as in
common industry practice.
