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20-90 VHF & UHF TRANSCIEVER 

 

Product Manual 

 

 

 

Sea Air and Land Communications Ltd, 10 Vanadium Place, Addington, Christchurch 8024, New Zealand 

September 2021 

Accessories and Related Products

 

 
 

Name 

Description 

Part Number 

RS-232 serial 
Port adaptor  

An RJ-12 to DB9 (RS-232) adaptor and cable for 
connection to the 20-90 serial port 

12-45-0000 

Ethernet 
Cable 

Standard Ethernet cable. 

Standard 
Ethernet Cable 

Configuration 
Software 

Salcom configuration tool (Sacoto). Can be 
downloaded from: 

http://www.salcom.com/products/20-90-0000-vhf-uhf-
transceiver

 

Website 
download 

Power 
Connector 

Screw terminal power connector. 

Supplied with 
product. 

RJ45 Cable 

RJ45 cable to allow the connection of trigger inputs 
and other functions. 

Supplied with 
product. 

 

 

 

 

Summary of Contents for 20-90

Page 1: ...Copyright 2021 Sea Air and Land Communications Ltd All rights reserved 20 90 VHF UHF Low Power Transceiver with Ethernet PRODUCT MANUAL Version 0 1 1 September 2021...

Page 2: ...f the fault to assist with prompt return Any unauthorised alterations or repairs will invalidate the warranty We reserve the right to change products specifications and installation data at any time w...

Page 3: ...Operation 13 Salcom Relay Control Protocol 14 20 90 Output Map 15 Special Functions 16 POCSAG Rapid 18 Watchdog messages 19 Store and Forward 20 Serial Commands 21 Sacoto Configuration Tool 22 Welcom...

Page 4: ...r and Land Communications Ltd 10 Vanadium Place Addington Christchurch 8024 New Zealand September 2021 Antenna Selection and Installation 40 Trouble Shooting 41 Glossary 42 Accessories and Related Pro...

Page 5: ...inimum on air time Serial and Ethernet ports The 20 90 may be controlled through either an RS 232 serial port or a TCP IP or UDP Ethernet connection Received messages may be directed to the serial por...

Page 6: ...ength request a checksum of the received message trigger messages to report the current input state report the state of all inputs and outputs or restart the 20 90 POCSAG rapid POCSAG rapid is a speci...

Page 7: ...d Flashing TX Solid channel busy 3 Power LED Green Slow blink ok Fast error 4 GPIO Relays and High current I O RJ45 5 Serial Serial port and Low current I O RJ12 6 Ethernet RJ45 Table 2 GPIO connector...

Page 8: ...l Sea Air and Land Communications Ltd 10 Vanadium Place Addington Christchurch 8024 New Zealand September 2021 Physical Dimensions The 20 90 has an extruded aluminum case with a mounting flange and sc...

Page 9: ...till providing transmit coverage into the weak signal area Important To comply with FCC Controlled Occupational Exposure Limits the aerial must be positioned or mounted to operate at least 0 26 metres...

Page 10: ...sy Transmission will start when the channel becomes clear Chanel busy conditions and thresholds can be configured using Sacoto Messages can be initiated over the Ethernet TCP or UDP connection This us...

Page 11: ...Numeric XXXXXXX is a 7 digit CAPcode Pager number Spaces as shown L is the function code beep level from 1 to 4 MMMMM is the message up to 240 characters CR is a carriage return enter key Alphanumeri...

Page 12: ...hold Other signals or interference on the channel can be detected by the received signal strength RSSI When enabled the TX Busy LED will be on whenever the received signal strength is above the RSSI t...

Page 13: ...lt range is 0000008 to 2000000 The ranges may be in any order and may overlap A CAP code range can be limited to just one CAP code if desired Triggering outputs An output may be closed or opened in re...

Page 14: ...pin changes to an output can be monitored and acknowledged by configuring the input messages for the I O pin This can also detect if the output protection or current limits have been activated Input...

Page 15: ...digits of any string of digits is always the unit ID Multiple relay control strings can be contained in one message each addressing a different unit ID The unit ID should not be a number that regular...

Page 16: ...n output with 5mA current limit 6 6 Output 6 RJ12 Open drain output with 5mA current limit 7 7 Output 7 RJ12 Open drain output with 5mA current limit 8 8 Message 8 Internal Trigger open and close mess...

Page 17: ...ge containing the checksum of the message that activated it Message received CA1234567 1 Checksum test 03069 Transmitted response CA1234560 1 00 C b6 The checksum function may be triggered without inc...

Page 18: ...orce a watchdog response in between regular watchdog events or to trigger the watchdog when the timer is not operating watchdog repeat time 0 Regardless of whether the watchdog timer is operating or n...

Page 19: ...state When used with POCSAG rapid messages are transmitted continuously in all eight frames of the POCSAG data stream until the input is released This allows the receiver to use a short mono shot tim...

Page 20: ...cial function described above This allows remote reading of the selected inputs at any time Monitoring a remote watchdog message A relay protocol command maybe included in a watchdog message to trigge...

Page 21: ...duplicate reject time only needs to be long enough that the message has already been relayed by all other repeaters within range Duplicate reject is not required if there is only one repeater Transmit...

Page 22: ...Retrieve 32 bit HEX number representing the output states up to 32 outputs Response 00000004 CR LF Explanation 4 third bit is set bit 2 Input 3 is closed low Note Reflects the true state of I O pins I...

Page 23: ...ependently of the Sacoto software Installation The latest version of Sacoto can be downloaded from the Salcom website from the 20 90 product page Unzip the downloaded file and run setup_Sacoto_n n n e...

Page 24: ...re various icons across the top for configuring Sacoto and for reading and writing 20 90 configuration to or from the unit or a file Device Menu Reading writing and setup functions can also be accesse...

Page 25: ...Device settings icon or select Device Set up device from the main menu It is not necessary to close the settings window first Refreshing the list after a USB port has been plugged in or unplugged can...

Page 26: ...ection settings in Sacoto TCP Client mode If you wish to configure the 20 90 in TCP Client mode then the 20 90 s Remote server and Remote Port must match your PC s IP address and the local port number...

Page 27: ...on to read the current configuration Sacoto main window after reading the configuration from a 20 90 Configuration Tabs Tabs along the top provide configuration options for the various 20 90 features...

Page 28: ...ation in Sacoto and in the configuration of the 20 90 is unknown If you want to preserve the settings in the device and only make a few changes you should read from the 20 90 first Write All If you wa...

Page 29: ...ome jurisdictions Channel Busy The transmitter can be inhibited if the channel is busy Enable Receiver state to inhibit transmission while receiving a message allowing transmission to begin after the...

Page 30: ...ly implemented but may be triggered by received relay protocol messages or CAP code ranges to generate acknowledgements The message corresponding to the initial input state can be sent at power up An...

Page 31: ...tab Cap code matching is enabled on the CAP code tab Busy is enabled on the Transmitter tab Since inputs and outputs share the same physical pins enabled inputs will respond to changes in the state o...

Page 32: ...ments and Special Functions The output may be used to trigger acknowledgment messages including special function messages like received RSSI or received message checksum The same range may be specifie...

Page 33: ...20 90 Output Map section The checksum feature may be enabled to provide additional protection against accidental relay activation by unrelated numbers in received messages See the relay protocol secti...

Page 34: ...o regularly send any input messages configured to be sent with watchdog depending on the input state The watchdog function is enabled by setting the Watchdog Repeat Time When set to zero the watchdog...

Page 35: ...be transmitted unaltered to another 20 90 also configured to serial pass through mode Serial pass through mode is activated after the unit is reset WARNING Once serial pass through mode has been acti...

Page 36: ...manual Port In addition to the IP address an Ethernet connection requires a port number There may be many ports available at an IP address each corresponding to a different connection on the device By...

Page 37: ...specified remote server address and port while a UDP server will send any response to the originating IP address and port At startup a UDP server will act as a client sending data to the remote IP add...

Page 38: ...es Testing a connection If the 20 90 is configured as a TCP server the test tool should be a client Enter the 20 90 s IP address and port number in the Remote IP Address and Port fields Click Connect...

Page 39: ...o can connect to the 20 90 via Ethernet directly without the use of a virtual COM port Important USR VCOM is proprietary software for exclusive use with USR Ethernet modules such as the USR TCP232 S2...

Page 40: ...ort number to assign to the virtual COM port If the 20 90 is a TCP server you must configure the virtual COM port as a TCP client Enter the IP address and port number of the 20 90 Click OK Turn on the...

Page 41: ...igh quality aerial and cable installation will provide additional performance and reliability Note The 20 90 is a low power device Transmission range can exceed 1000m in an open outdoor environment wi...

Page 42: ...Relay protocol checksum enabled but missing or incorrect in message Unit transmits rapidly flashing red LED but nothing received on pager Check pager configuration Wrong frequency Incorrect channel w...

Page 43: ...itting Duty cycle is commonly expressed as a percentage or a ratio POCSAG A radio transmission standard for the on air coding and signaling used for paging NRZ Non return to zero Digital data that may...

Page 44: ...232 adaptor and cable for connection to the 20 90 serial port 12 45 0000 Ethernet Cable Standard Ethernet cable Standard Ethernet Cable Configuration Software Salcom configuration tool Sacoto Can be...

Page 45: ...n RJ45 connector Open drain outputs Two 500mA open drain outputs with resettable fuses on RJ45 Three 5mA current limited open drain outputs on RJ12 Inputs Five active low inputs on open drain output p...

Page 46: ...Slow Flashing Normal Operation Fast Flashing low battery TX Busy LED Red Flashing fast Transmitting Solid on Chanel busy Weight 178g Enclosure Dimensions 130mm x 68mm x 31mm WxDxH Enclosure Material...

Page 47: ...gin accreditation programme designed to protect and promote New Zealand products to the world From now on you should see the FernMark the Government s trademarked Silver Fern appear on some or all of...

Page 48: ...P a g e 47 20 90 VHF UHF TRANSCIEVER Product Manual Sea Air and Land Communications Ltd 10 Vanadium Place Addington Christchurch 8024 New Zealand September 2021...

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