RFDATATECH SRT150R User manual

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SRT PAGING & DATA
RECEIVER MANUAL
Covering the following:
SRT150R, SRT280R, SRT320R, SRT450R & SRT950R

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CONTENTS
1.0 INTRODUCTION
1.1 APPLICATIONS
1.2 SPECIFICATION
1.3 RS232 SERIAL PORT
1.4 PROGRAMMING
1.5 RSSI
1.6 SOFTMODEM
1.7 REMOTE SWITCH APPLICATIONS
1.8 EXTERNAL AUDIO OUTPUT
1.9 EXTERNAL DIGITAL OUTPUT
1.10 PAGING MODE
1.11 DATA MODE
1.12 POWER SAVE
1.13 PROGRAMMABLE POWERSAVE
1.14 EXTERNAL POWERSAVE
1.15 STATUS LEDS
1.16 FREQUENCY RANGES
2.0 SPECIFICATIONS
2.1 GENERAL
2.2 RECEIVER
2.3 SERIAL INTERFACE
2.4 AUDIO MODE
2.5 EXTERNAL DIGITAL MODE
2.6 DATA MODE
2.7 POCSAG PAGING MODE
2.7.1 PROGRAMMABLE ADDRESSING
2.7.2 PROGRAMMABLE TEXT OPTIONS
2.8 ACCESSORIES
3.0 OPERATION & INTERFACE
3.1 CONNECTION DETAILS
3.2 POWER SUPPLY
3.3 RS232 SIGNALS
3.4 RX AUDIO OUTPUT
3.5 RSSI OUTPUT
3.6 FUSES & LINKS
3.7 DIMENSIONS
3.8 MOUNTING
4.0 PROGRAMMING
4.1 SETUP PROGRAM
4.2 OPENING MENU
4.2.1 PROGRAMMING/READING RADIO
4.2.2 VERSION NUMBER & COMPATIBILITY MESSAGE
4.2.3 EDIT NOTES
4.3 MAIN EDIT MENU
4.4 MENU COMMONALITIES
4.4.1 FREQUENCY RANGE
4.4.2 RX FREQUENCY
4.4.3 CHANNEL RESOLUTION

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4.4.4 SLEEP MODE
4.4.5 POWER SAVE OPTIONS
4.4.5.1 Save On Time
4.4.5.2 Save Off Time
4.4.5.3 Save Resume Time
4.4.6 SERIAL BAUD RATE, DATA BITS, PARITY & STOP BITS
4.5. PAGING RECEIVER MENU
4.5.1 RADIO DATE RATE
4.5.2 DIGITAL OUTPUT MODE
4.5.3 PAGER TEXT ADDRESS 1 – 4
4.5.4 PAGER DIG OP ADDRESS
4.5.5 POCSAG SOT CHARACTER/POCSAG SOT MODE
4.5.6 POCSAG EOT CHARACTER/POCSAG EOT MODE
4.5.7 SUPPRESS POCSAG NULLS
4.7.8 DIGITAL OUTPUT MESSAGES
4.6 DATA RECEIVER MENU
4.6.1 RADIO BAUD RATE
4.6.2 RADIO DATA BITS
4.6.3 RADIO PARITY
4.6.4 RADIO STOP BITS
4.6.5 FFSK TONE SET
4.6.6 FFSK SYNC/ASYNC
4.7 EXTERNNAL AUDIO RECEIVER MENU
4.7.1 CARRIER MUTE
4.8 EXTERNAL DIGITAL RECEIVER MENU
4.8.1 RADIO BAUD RATE
4.8.2 RX SIGNAL POLARITY
R.F. Technologies Ltd
27 – 29 New Road
Hextable
Kent BR8 7LS
Tel: [phone]
Fax: [phone]
Email: [email protected]k
1.0 INTRODUCTION

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The SRT Series are high quality receivers with an RS232 output and two addressable digital
outputs. Designed for the Paging and Data markets, the products are available in the VHF,
280MHz, 320MHz, UHF & 930MHz bands.
The SRT series feature flash processor to allow easy program upgrades or changes should
they be required. The receiver is built into a small, milled aluminium housing which can be
DIN or panel mounted.
1.1 APPLICATIONS
The SRT receivers can be used in wide or local area paging and data systems.
Applications include; information receivers, wireless local or wide area sign control, point
and multi-point data distribution, remote control of systems & equipment, telemetry and
transmitter site monitoring. For suitable local area transmitters, see the ART series
of Data
& Paging transmitters.
1.2 SPECIFICATION:
The SRT products have been developed for use in areas of high interference and low signal
levels, but where the correct reception of data is still critical. Particular attention has been
given to the sensitivity, Intermodulation, selectivity, blocking and spurious response
parameters to ensure the product will perform in even the worst areas.
1.3 RS232 SERIAL PORT
The SRT receivers have a programmable RS232 port that may be programmed for
for 1200, 2400, 4800 or 9600bps with various data and stop bits.
1.4 PROGRAMMING
The SRT Series can be programmed directly from a PC. Programmable
parameters include; RF channel, POCSAG or Data mode, Serial port set-up &
Power save functions.
1.5 RSSI
The Receivers Signal Strength is measured within the receiver and the DC voltage
representing the level is fed to both the internal processor and outside via the 15W
“D” connector. The internal processor converts this voltage to a uV value which can be read
by a host PC or microprocessor to provide link conditions during set-up.
1.6 SOFTMODEM
The SRT features a “soft modem” which offers unparalleled performance and flexibility over
a wide range of speeds and formats and enables future formats to be downloaded from a PC.
The current firmware supports; 150-2400bps FFSK with Bell202 & V23 supported, 150-4800
FSK, 4800bps GMSK & 512, 1200 & 2400 POCSAG.
1.7 REMOTE SWITCH APPLICATIONS
The SRT Receivers have two programmable open collector outputs and in the paging mode
they can programmed with unique addresses for stand alone remote switch operation within
a paging scheme. The switches can be operated in an On/Off, Momentary or programmable
timed mode.
1.8 EXTERNAL AUDIO OUTPUT
A buffered audio output has been provided where the internal modem is not required.
1.9 EXTERNAL DIGITAL OUTPUT

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The external digital output is direct FSK, that can be programmed between
150-4800bps.
1.10 PAGING MODE
When used as a Paging receiver, the SRT’s internal “softmodem” can be programmed for
speeds of 512, 1200 & 2400bps.
1.11 DATA MODE
When used as a data receiver, the SRT’s “softmodem” can be programmed to receive data
between 150 – 2400bps FFSK with V23 & Bell 202 supported or 4800bps GMSK.
1.12 POWER SAVE
The Receivers may be powered down to reduce current consumption using the sleep mode,
this can be enabled by selecting a combination of the RTS and program enable lines.
1.13 PROGRAMMABLE POWERSAVE
The microprocessor controls the on/off function of the receiver and after a pre-programmed
time the MPU will switch on the receiver to look for a carrier. If a carrier is not detected, the
transceiver goes back into sleep mode. If during the time the transceiver is awake a carrier is
received, the unit will stay awake. After the carrier drops out, the receiver will stay awake
until the programmed resume time elapses. Once the resume time has elapsed the
transceiver will go back into sleep mode. The save ON/OFF and resume time are all
programmable via the PC program.
1.14 EXTERNAL POWERSAVE
In the external power save mode the ON/OFF function of the receiver is controlled by the
host via the RTS & DTR line.
1.15 STATUS LED’s
The SRT Receivers have LED’s to indicate the status of the product.
These include; SYSTEM, BUSY, DATA, RXD, TXD, DCD, RTS & DTR.
The system LED is used to detect any internal product error and will flash a code
to indicate the error and the radio will reset. The fault can then be determined simply by
counting the number of flashes & looking up the error code in the installation, operation and
programming manual. If the error persists the radio will stay in the error mode permanently.
1.16 FREQUENCY RANGES
Although the defined frequency ranges in the specification cover most Paging & Data
applications. We can supply product against special orders anywhere between
130 – 950MHz.
2.0 TECHNICAL SPECIFICATIONS
2.1 GENERAL

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Power Requirement: 12V Nominal (10 –16VDC)
or 5VDC
Protection: Internal fuses
Number of Channels: 1 programmable
Channel Spacing: 25KHz (optional 12.5 , 20 & 30KHz)
Operating Temperature: -30deg C to +60Deg C.
Humidity: 0 - 95% Non-Condensing
Frequency stability: <2.0ppm -25deg C to +60deg.C
Construction: Milled aluminium enclosure
Size: 54mm W, 125mm H, 48mm D
Weight: 280gms
Connectors: Interface 15way condensed “D”
Antenna BNC
Approvals: Will Meet current UK, European, USA, Canadian
and Australian specifications.
2.2 RECEIVER:
Frequency Range: SRT150R 138 - 175MHz
SRT280R 260 – 285MHz
SRT320R 320 - 340MHz
SRT450R 406 - 512MHz
SRT950R 820 – 950MHz
Programmable
Bandwidth: SRT150/280/320R 5MHz
SRT450R 10MHz
SRT950R 5MHz
Sensitivity: Better than -120dBm for 99% decodes
Blocking: >90dB relative to 1µV
Intermodulation: >60dB
Spurious & Image
response: VHF & UHF >75dB
900MHz >65dB
Adjacent channel: >70dB at 25KHz
IF frequencies: 45MHz and 455KHz

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Spurious emissions: <2nW
Mute response time: <3msec
Received Signal Strength
(RSSI): Range -120dBm to -40dBm
Output voltage 0-5VDC
2.4 SERIAL INTERFACE
Type: RS232 with a programmable serial baud
rate of 1200, 2400, 4800 or 9600bps.
Data Bits: Programmable 7 or 8.
Parity: Programmable Odd, Even, or None.
Stop Bits: Programmable 1 or 2.
2.3 AUDIO MODE
Audio Output: Flat 150mV peak-peak
Frequency Response: DC - 3KHz (12.5KHz Channel)
DC - 4.5KHz (25KHz Channel)
2.5 EXTERNAL DIGITAL MODE
Programmable Data Rates: 150 – 4800bps
2.6 DATA MODE
Signalling Formats: V23, Bell202, FFSK, 2 level FSK, 4 Level FSK & GMSK.
NRZI: On or Off
Baud Rate: 150 – 4800bps
Bit Error Rate: 2400 baud, less than 1 in 10-3 at –120dBm
4800 baud, less than 1 in 10-3 at –117dBm
2.7 POCSAG PAGING MODE
Signalling formats: 512, 1200 & 2400 POCSAG
POCSAG Decoder Better than 99% decoded
for –120dBm at 512bps

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2.7.1 Programmable Addressing
Text address: 4 Addresses & Groups
Digital outputs: 1 Address & Group per output
2.7.2 Programmable Text Options
Start of text character: None or 1
Start of text ch. mode: Keep, Delete, Insert
End of text character: None or 1
End of text ch. mode: Keep, Delete Insert
Suppression of nulls: On or Off
2.8 ACCESSORIES
Antennas:
Rubber helical
¼ wave whip antenna
Power supplies:
110/240AC to 12VDC PSU
Programming software:
DOS SRT Programming software
WIN95 SRT Programming software
Mounting Bracket
ART54/MB Individual mounting bracket
In the interest of improvement the above specifications are subject to change without notice.

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3.0 OPERATION & INTERFACE
3.1 CONNECTION DETAILS
Control signals are made to the receiver by the 15 way “condensed D” connector. Pin
connections are as follows:
1 RXD
2 TXD
3 DCD
4 DTR
5 RTS
6 Ground
7 Ground
8 Ground
9 Ground
10 RX audio
11 Digital output 0
12 Digital output 1
13 RSSI voltage
14 +5V supply (note 1)
15 +12V supply (note 1)
Note 1: The receiver is supplied either for use with a 5V power supply or for use with a 12V
supply, do not connect a 5V supply if the unit has been supplied for use with a 12V supply.
3.2 POWER SUPPLY
The receivers can be supplied to operate either from a 5V or 12V power source, this option is
set by the fitting or depopulation of certain components at the time of manufacture, for this
reason the correct power supply for which the unit was manufactured must be used. When
using a 5V power source ensure that the supply is well regulated and within the limits 4.75 to
5.25V. A 12V supply need not be regulated and may lie in the range 9V to 15V.
3.3 RS232 SIGNALS
RXD and TXD are the RS232 level serial connections, RXD is the received data output, TXD is
the serial data input used during programming. Note that if LK1 on the PCB is not bridged
the RS232 driver is switched off if DTR and RTS are inactive. In this condition RXD and DCD
will fall to 0V instead of a normal RS232 level.
The mode of the receiver is controlled by RTS and DTR as follows:
DTR RTS MODE
low low Sleep
low high Program
high low Receive
high high -
When connecting to a PC to use the set up program TXD, RXD, DTR and RTS and ground
connections are required, the PC programme sets DTR and RTS to the correct levels during
programming.
For normal receive operation DTR must be connected to a signal of +3V to +12V, RTS and
TXD may be left disconnected or connected to ground. Receive data is then output on RXD.

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DCD provides an indication that a carrier with valid modulation is being received.
3.4 RX AUDIO OUTPUT
The RX audio output delivers the analogue received audio signal, the signal is muted in the
absence of a carrier.
3.5 RSSI OUTPUT
The RSSI output provides an indication of the received signal strength, the DC signal varies
in proportion to the logarithmic value of the signal strength over the range 0 – 5VDC.
Its level is not calibrated and its value cannot be guaranteed from device to device.
3.6 DIGITAL OUTPUTS
The digital outputs are open collectors that can be controlled with POCSAG messages and
can be set for normally open / normally closed or timed operation. For further information
see section 4.5.8.
3.7 FUSES & LINKS
Fuse 1 12VDC
Fuse 2 5VDC
Link 1 LK1

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3.8 DIMENSIONS
3.9 MOUNTING
The SRT is designed for DIN rail mounting to a standard DIN rail or to a short clip
bracket. Alternatively, we have a non-clip bracket, that is inserted into the DIN rail
slot and the bracket is screwed to the wall/flat plate with the module attached. Once
fixed the unit be removed without unscrewing the bracket.
SRT RX.
RS232
ANTENNA
R. F. Technologies Ltd.
SYS
BUSY
DAT
RXD
TXD
DCD
RTS
DTR

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4.0 PROGRAMMING
4.1 SETUP PROGRAMME
The DOS set up programme should be copied to a suitable hard drive directory on your PC,
the files required are CMP.EXE, DEFAULTS.DAT and RP.CFG. To start the programme open
a DOS window and type “CMP”, or alternatively to set the programme up for a different
screen or communications port type “CMP/C" and follow the instructions given.
Note that the CMP programme is used to set up several other types of radio besides the
paging receiver and so some fields may seem irrelevant.
On starting the programme will load and display the opening menu.
4.2 OPENING MENU
"Arrow Keys" are used to move round the menu and the RETURN key is used to make the
selection required. Whenever a programme is produced for a radio, it may be stored and
retrieved from disc by using the SAVE TO DISC and LOAD FROM DISC options.
4.2.1 PROGRAMMING/READING RADIO
The radio data can be read using the “Read Radio” function or programmed with the
“Program Radio” function. Reading/programming progress is shown on the screen, when
programming/reading has finished the screen reverts to normal.
4.2.2 VERSION NUMBER & COMPATIBILITY MESSAGE
If new fields are added or changes are made to the PC program, the version number changes
but in most cases a new program will program older radios. To complicate matters more,
over time there will be changes and upgrades to the firmware in the radio which may not be
compatible with older PC programming software. To overcome this, each modem has a
compatibility serial number which is changed at the factory if and when the firmware
changes. If the product and PC software are not compatible, the PC will not read or write to

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the modem but will display a compatibility error message. If this happens a different edition
of PC programming software with the same compatibility number may be required.
4.2.3 EDIT NOTES
The PC program has a text editor accessed from the main menu that will allow the user to
enter the unit’s hard link configuration and add notes if required. The file has defaults but
these can be over typed and changed as required.
4.3 MAIN EDIT MENU
The from the edit menu the “OPERATING MODE” mode can be selected, this selection will
display one of four menus, the common elements are outlined below
4.4 MENU COMMONALITIES
4.4.1 FREQUENCY RANGE
The frequency range must be set to encompass the band of frequencies that the receiver has
been aligned for. For paging applications the MPT1329 and MPT1411 settings may be
ignored.
4.4.2 RX FREQUENCY
The RX frequency can be typed in or if one of the UK bands is selected, the selection of a
channel number will display the frequency.
4.4.3 CHANNEL RESOLUTION
The operating frequency of the receiver must be an integer multiple of the channel resolution,
the resolution can be set to 5 or 6.25kHz. If either can be multiplied up to give the operating
frequency show preference to 6.25kHz.
4.4.4 SLEEP MODE
Sleep mode can be turned on or off, if sleep mode is enabled the processor and peripheral
circuits are shut off when DTR and RTS are both de-activated. Note that if solder link LK1 on
the main circuit board is bridged the RS232 driver chip remains active during sleep. If the link
is left open the RS232 driver shuts off when DTR and RTS are de-activated even if sleep mode
is disabled in software.
4.4.5 POWER SAVE OPTIONS
The save on, save off and resume time are all programmable parameters to provide further
power saving features.
4.4.5.1 Save On Time
This parameter sets the time the receiver is switched off for during the power save cycle
(power save on). The Save On Time is programmable from 0 - 1500ms in 100ms steps. A
setting of 0 disables power save.
4.4.5.2 Save Off Time
This parameter sets the time the receiver is switched on for during the power save cycle
(power save off). The Save Off Time is programmable from 100 - 1500ms in 100ms steps.
4.4.5.3 Save Resume Time
When a carrier is received during power save mode, the unit will come out of its power save
mode to receive the signal. The resume time is the time the receiver stays active after the
received carrier has dropped out, i.e. the time power save mode is deferred. This is
programmable between 0 - 255 seconds in 1 second steps.

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4.4.6 SERIAL BAUD RATE, DATA BITS, PARITY & STOP BITS
The format of the serial port signal is set with these options, note that a setting of 7 data bits
with no parity will always result in 2 stop bits being output regardless of the setting of the
STOP BITS option.
4.5 PAGING RECEIVER MENU
4.5.1 RADIO DATE RATE
This field must be set to match the baud rate of the incoming POCSAG paging signal. 512,
1200 or 2400 baud may be set.
4.5.2 DIGITAL OUTPUT MODE
The two digital outputs can be programmed for normally open (N/O) or normally closed
(N/C) operation. The outputs are not isolated relay contacts but open drain mosfet outputs
referenced to ground, they are rated at 30V maximum switching voltage and 100mA current.
Switching of inductive loads should be avoided.
4.5.3 PAGER TEXT ADDRESS 1 – 4
The receiver will output text for any of the four text addresses programmed, the group code
(also known as beep type) can be set such that text is only output for a specific group code or
for all group codes. An address is disabled by setting it to zero.
4.5.4 PAGER DIG OP ADDRESS
Commands for the digital outputs are encoded using text messages, the address to which the
messages must be sent is set by this field, note that this address must be different from the
text addresses. As with text messages the receiver can be programmed to respond to a
specific group code or to all group codes.

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4.5.5 POCSAG SOT CHARACTER/POCSAG SOT MODE
This field allows various operations on a start of text character, the SOT MODE field only
appears if a SOT character has been entered. The SOT character must be entered as a hex
value. If the SOT mode is set to keep or delete no text is output until the first occurrence of
the SOT character, if the mode is keep the SOT character and the following text are output, if
the mode is delete only the following text is output. If the mode is set to insert the SOT
character is inserted at the start of each received text message.
4.5.6 POCSAG EOT CHARACTER/POCSAG EOT MODE
This field operates similarly to the SOT options for an end of text character. If the mode is
keep or delete all text is output until the EOT character is encountered, if the mode is keep the
EOT character is output, if the mode is delete it is not. If the mode is insert the EOT character
is inserted at the end of each text message.
4.5.7 SUPPRESS POCSAG NULLS
Unused spaces in POCSAG messages are padded with null characters, if this option is set to
YES these null characters are suppressed.
4.5.8 DIGITAL OUTPUT MESSAGES
The digital outputs are controlled using two character messages, the first character should be
ascii "0" or ascii "1" (hex 30 or hex 31) to address output 0 or 1 respectively, the second
character determines the output action as tabulated below. Note that the outputs are open
collector, where the table indicates that an output is ON the open collector output will be
conducting producing a logical "low", to see a logical "high" the output must be OFF and
pulled up (to no more than 30V) using a suitable pull up resistor. The actions outlined below
assume that the digital outputs are programmed for normally open (N/O) operation, setting
normally closed (N/C) operation inverts all the actions.
In summary all characters in the range 00 to 3F hex will turn an output off, the character 40
will turn it on indefinitely. Characters in the range 41 to 5F will pulse an output on for 10ms
times the value of the 5 lsb of the character, characters in the range 61 to 7F will pulse an
output on for 1s times the value of the 5 lsb of the character.
Note that POCSAG text messages use 7 bit characters, and therefore the binary form shown
below does not have an 8th bit.
It is permissible to string commands together to control both outputs simultaneously, for
example the message
0a1b (hex 30,61,31,62)
turns on output 0 for 1 second and output 1 for 2 seconds.
HEX BINARY ACTION
00 0 0 0 0 0 0 0 OFF
.
.
to ALL CHARACTERS IN THE RANGE
. 00 TO 3F HEX TURN OUTPUT OFF.
.
3F 0 1 1 1 1 1 1 OFF
40 1 0 0 0 0 0 0 ON PERMANENTLY
41 1 0 0 0 0 0 1 ON FOR 10ms
42 1 0 0 0 0 1 0 ON FOR 20ms

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43 1 0 0 0 0 1 1 ON FOR 30ms
44 1 0 0 0 1 0 0 ON FOR 40ms
45 1 0 0 0 1 0 1 ON FOR 50ms
46 1 0 0 0 1 1 0 ON FOR 60ms
47 1 0 0 0 1 1 1 ON FOR 70ms
48 1 0 0 1 0 0 0 ON FOR 80ms
49 1 0 0 1 0 0 1 ON FOR 90ms
4A 1 0 0 1 0 1 0 ON FOR 100ms
4B 1 0 0 1 0 1 1 ON FOR 110ms
4C 1 0 0 1 1 0 0 ON FOR 120ms
4D 1 0 0 1 1 0 1 ON FOR 130ms
4E 1 0 0 1 1 1 0 ON FOR 140ms
4F 1 0 0 1 1 1 1 ON FOR 150ms
50 1 0 1 0 0 0 0 ON FOR 160ms
51 1 0 1 0 0 0 1 ON FOR 170ms
52 1 0 1 0 0 1 0 ON FOR 180ms
53 1 0 1 0 0 1 1 ON FOR 190ms
54 1 0 1 0 1 0 0 ON FOR 200ms
55 1 0 1 0 1 0 1 ON FOR 210ms
56 1 0 1 0 1 1 0 ON FOR 220ms
57 1 0 1 0 1 1 1 ON FOR 230ms
58 1 0 1 1 0 0 0 ON FOR 240ms
59 1 0 1 1 0 0 1 ON FOR 250ms
5A 1 0 1 1 0 1 0 ON FOR 260ms
5B 1 0 1 1 0 1 1 ON FOR 270ms
5C 1 0 1 1 1 0 0 ON FOR 280ms
5D 1 0 1 1 1 0 1 ON FOR 290ms
5E 1 0 1 1 1 1 0 ON FOR 300ms
5F 1 0 1 1 1 1 1 ON FOR 310ms
60 1 1 0 0 0 0 0 ON FOR 0s (DO NOT USE)
61 1 1 0 0 0 0 1 ON FOR 1s
62 1 1 0 0 0 1 0 ON FOR 2s
63 1 1 0 0 0 1 1 ON FOR 3s
64 1 1 0 0 1 0 0 ON FOR 4s
65 1 1 0 0 1 0 1 ON FOR 5s
66 1 1 0 0 1 1 0 ON FOR 6s
67 1 1 0 0 1 1 1 ON FOR 7s
68 1 1 0 1 0 0 0 ON FOR 8s
69 1 1 0 1 0 0 1 ON FOR 9s
6A 1 1 0 1 0 1 0 ON FOR 10s
6B 1 1 0 1 0 1 1 ON FOR 11s
6C 1 1 0 1 1 0 0 ON FOR 12s
6D 1 1 0 1 1 0 1 ON FOR 13s
6E 1 1 0 1 1 1 0 ON FOR 14s
6F 1 1 0 1 1 1 1 ON FOR 15s
70 1 1 1 0 0 0 0 ON FOR 16s
71 1 1 1 0 0 0 1 ON FOR 17s
72 1 1 1 0 0 1 0 ON FOR 18s
73 1 1 1 0 0 1 1 ON FOR 19s
74 1 1 1 0 1 0 0 ON FOR 20s
75 1 1 1 0 1 0 1 ON FOR 21s
76 1 1 1 0 1 1 0 ON FOR 22s
57 1 1 1 0 1 1 1 ON FOR 23s
78 1 1 1 1 0 0 0 ON FOR 24s
79 1 1 1 1 0 0 1 ON FOR 25s
7A 1 1 1 1 0 1 0 ON FOR 26s
7B 1 1 1 1 0 1 1 ON FOR 27s
7C 1 1 1 1 1 0 0 ON FOR 28s
7D 1 1 1 1 1 0 1 ON FOR 29s
7E 1 1 1 1 1 1 0 ON FOR 30s
7F 1 1 1 1 1 1 1 ON FOR 31s

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4.6 DATA RECEIVER MENU
4.6.1 RADIO BAUD RATE
Sets the baud rate of the internal radio modem, (currently 150 – 4800 baud within the
prescribed 12.5KHz channel) this setting does not govern the speed at which the serial port
operates which should be set either at the same speed or a higher speed. The radio baud rate
should be set at the minimum possible to maintain the required throughput, lower speeds
will give better results in poor signal conditions.
4.6.2 RADIO DATA BITS
Selects either 7 or 8 bits
4.6.3 RADIO PARITY
Selects none, even or odd
4.6.4 RADIO STOP BITS
Selects either 1 or 2.
4.6.5 FFSK TONE SET
Selects either Bell 202 or V23 mode 2, Bell 202 tones should be selected if possible since their
wider separation yields better performance, V23 tones however are more common in existing
systems. The tone set is fixed at speeds above 1200 baud.
4.6.6 FFSK SYNC/ASYNC
Allows either synchronous or asynchronous selection at up to 1200 baud FFSK.

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4.7 EXTERNAL AUDIO RECEIVER MENU
4.7.1 CARRIER MUTE
This function allows the carrier mute to be enabled or disabled
4.8 EXTERNAL DIGITAL RECEIVER MENU
4.8.1 RADIO BAUD RATE
The Data baud rate can be set between 150 – 4800bps
4.8.2 RX SIGNAL POLARITY
This enables the selection of a true or inverted signal