Gateway AKA 245 REFRIGERATION AND AIR CONDITIONING Manual
Contents System survey ...................................................................................................................................... 3 Technical data ...................................................................................................................................... 4 Connections ............................................................................................................................................................... 4 Data ....................
System survey Principle Gateway types AKA 245 is a system component to be used in conjunction with controllers in the ADAP-KOOL® series of controls for refrigerating systems. When the gateway is used it is possible to build complex control systems with alarm monitoring and data logging into decentralised refrigerating plant. All controllers in the AKC series are linked up in a two-core data communication system that is registered under the name DANBUSS Data Communication System.
Technical data Connections AKA 245 AKA 21 When mounted, AKA 21 is connected for setting of address, etc. DANBUSS Here there is a DANBUSS connection from one of the other units in the system. The connections are described in a separate document bearing literature number RC0XA--LON Here the data communication is connected to controllers with a LONWORKS® - RS 485 interface (eg EKC 201, 300, 400, 500 or AK 2 controllers).
On/off inputs (DI1, DI2) Input DI1 is used for the printer’s paper function. DI1 is connected to a contact function which is operated when the paper has been placed in the printer. (Top of form setting). The DI2 input is used for manual change-over between “default” and “optional” alarm destinations in connection with the extended alarm routing (cf. section “AKA Alarm Table”).
Functions overview Connection/function Gateway type AKA 245 Connection: PC Modem TCP/IP server DANBUSS LON RS 485 Printer Battery backup AKA 21 Ordering More details on page x x x x x x x x 10 11 11 7 8 8 9 7 x x 13 13 Funcion: Communication control Clock function Automatic setup of controllers alarm function x 13 Alarm handling Alarm recipient Alarm list Alarm status AKA Alarm table Printer function Data colleciton PC, Modem or TCP/IP connection AKA override function Operation via system softw
Connections Supply voltage 230 V a.c. Max. fuse 10 A AKA 245 must always be provided with earth connection. This is to guarantee safety for persons and noise immunity. DANBUSS Data communication cable Terminals No. K4 K3 K1 H L Screen In general, the data communication is connected from controller to controller, so that L is connected to L, and H is connected to H. The cable must be twisted in pairs and with screen.
Termination To obtain correct data transmission, the data transmission cable must be terminated. On the PC board next to the DANBUSS connection there are two wire switches which must either be closed or open, depending on where the gateway is placed in the system. 1) As the last unit on the data transmission cable: The wire switches are kept closed (BUS TERM “ON”) 2) The gateway retransmits the signal: The wire switches are opened (BUS TERM "OFF"). LON Terminals: No.
Manual change-over of alarm routing You may change manually between two different alarm routes. The DI2 ON/OFF input can be connected to a contact function. When the DI2 input is cut in, the alarms will be sent via route 2 (optional destinations). (Cf. section “AKA Alarm Table”). Alarm relay The DO2 output can be used for connecting an alarm function. There is connection between terminals 13 and 14 when the gateway is energised and there is no alarm.
PC, Modem or server connection A PC, a modem or a TCP/IP server can be connected to the RS232 plug. A setting in the gateway determines the application. Warning! In order not to destroy the output on the PC, the modem or the server the following precautions must be taken: - Establish the correct earth connection on AKA 245 - Interrupt the supply voltage to the gateway and to the PC / the Modem / the server, when the cable is mounted and dismounted.
Modem to gateway Use a standard modem cable. Supply voltage to the modem must be connected, as illustrated (via DO1). This will permit AKA 245 to reset the modem. Also, the modem will be switched on and its start controlled, when AKA 245 is switched on. TCP/IP server to gateway and TCP/IP server to PC So far two servers have been tested: - ”Lantronix MSS 100” (shown above) The server to be ordered from a Lantronix dealer. A 3 m cable with plugs mounted to be ordered from Danfoss. See Ordering.
Functional description Network information The gateway that has been assigned the master function in a network automatically establishes a table (plant list) containing the addresses of all connected units. The gateway then picks up data from all these addresses (also its own) for this table. The obtained data are the unit’s code number and software version.
Communication control This function will ensure that there is correct communication between the connected units on DANBUSS and LON. There will be constant scanning of all units on DANBUSS and LON. If there are any changes on DANBUSS (a unit drops out due to power failure, or a new unit suddenly appears on the network), the function will discover it and issue an “Communication error (DANBUSS)” or “Communication OK (DANBUSS)”. New units are found within five minutes.
Alarms from EKC controllers will also be registered by AKA 245, but if the data connection between the EKC controllers and the gateway is interrupted, only an active alarm, if any, will be present when the connection is reestablished. In other words, all alarms occurring during the period without data communication will not be registered. Alarm receipt Alarms can be received in four ways: 1) The alarm is not passed on(factory setting). The alarm is entered on the alarm list, but is not processed.
Alarm list in AKA 245 The alarm list can be displayed from system software type AKM or from control panel type AKA 21. From AKM: via the “History" - "AKA Alarm List” menu. From AKA 21, as follows: - select the master gateway (address = 125) - push key “F1” on AKA 21. The text ALARM LIST will then appear. - now select the individual alarm numbers and display the text for each of them. Alarm status The individual messages on the alarm list will contain information about the status of the alarm.
AKA Alarm Table (alarm routing) This function can retransmit received alarms to different alarm receivers via the DANBUSS data communication system. The alarm routing can only be defined in the gateway that has been assigned the master function (address 125). Alarm routing takes place on the basis of an alarm table where two different groups of receivers can be set. 1) Default destinations, route 1, which is the normal receiver group. 2) Optional destinations, route 2.
Printer function Alarm printout The master gateway (adr. 125) contains a function that can receive alarm reports from controllers, reformat the messages and print them on a connected printer, type Epson compatible matrix printer. For this function to be used, the controllers must be set to transmit its alarms to a gateway with connected printer. Cf. section: “Automatic setup of controllers alarm functions”, page 13. The alarm printout function supports AKC controllers in series AK 20 and AK 100.
Data collection in the master gateway Data collection can take place in the gateway, defined to be the system’s master. In connection with definition, start, stop and display of a data collection (logs), a switch will be required for the PC. During the remaining time the gateway will take care of its own collection of data. Data may thus be collected in a system which is not directly connected to a PC. The collected data may subsequently be transmitted to a PC from time to time, so that it can be displayed.
Modem connection AKA 245 can act as connecting link between DANBUSS and a modem. (DANFOSS can provide information about other modem types that can be used with the gateway) By connecting the supply to the modem via a relay switch (DO 1) on the gateway, the gateway will be able to reset the modem. At the same time the modem will be switched on, when the gateway is switched on. This ensures that the modem start will always be controlled. Read the section “Connections”.
AKA override function AKA 245 contains a function capable of reading values from a given function in a given controller on Data communication. The gateway will treat the information and then set the values in other selected controllers in the system. Each individual controller will subsequently carry out the given function. You can max. download data from 100 controllers. Otherwise the data communication will be overloaded. The functions are also described in the document ”Overriding, RI8AL-”.
PO optimisation The function adapts the refrigeration system’s suction pressure so that it will not become so low that the most heavily loaded refrigeration appliance is unable to maintain the required temperature. The procedure is that the gateway constantly makes enquiries with the selected refrigeration appliances following which it transmits signals to the compressor control.
Operation Principle On AKA 245 there are no buttons. The unit is exclusively operated via control panel type AKA 21 or system software type AKM. Operation via AKA 21 Operation from AKA 21 takes place via a menu system coded into the gateway. The gateway menu structure has been “lowered” in relation to the menu structure of the AKC controllers. Change between menus takes place by means of the control module’s arrow keys. Display The display in AKA 21 has two lines with 16 characters each.
Operation via system software type AKM If a PC with system software type AKM is connected to the system, it will be possible to: - perform all settings from the PC - receive alarms on the PC - connect a printer to the PC where printouts will be made of all alarms Access limitation AKA 245 are protected against inadvertent settings and changes of parameters from AKA 21.
Settings General In the gateway you have to set up the parameters that are to govern the individual functions. The parameter setup is grouped according to the functions governed by the parameters. GATEWAY, Code Access display and keying of number giving access to the gateway setup. Time setting Setting of gateway timer; including changeover between summer and winter time. Configuration Reading of programme version. Setting of access codes.
GATEWAY, Code. Access display and access code Access to the gateway takes place with control panel AKA 21 in the same way as for other controllers on DANBUSS. Shown in the AKA 21 display are the units that are connected to DANBUSS. The AKA 245 gateway is symbolised with a “G”. < AAE 125 > 125 A A G AKA 245 with assigned address = 125 is depicted here A gateway that has been assigned the master function will have address No. 125.
Time setting. Clock function “Time setting” Access to setting of timer and changeover between summer and winter time. The timer in the gateway is an annual timer that can change between summer and winter time. The timer will itself determine the day of the week based on year and date, and it will not accept incorrect settings. If an attempt to set the month, for example, is not crowned with success, it may be because the date has a wrong value.
Configuration. Access codes and display “Configuration” “Code no.” “Prog. ver.” “Normal limit” “Extended limit” “Extended code” “Service code” “Dansett time” “Dansett logoff ” “Change logoff ” Password AKA 245 Access to reading of programme version and setting of access codes/ parameters concerning DANSETT logoff. Reading of AKA part No. Reading of programme version Setting of access level without using an access code. (A complete menu survey is shown at the back of the manual).
Address & GWtype Address and gateway type “Network” Setting of the network number at which the gateway is installed. Valid network numbers: 1 to 255. “Address” Setting of gateways address. This setting corresponds to the setting of addresses on the AKC controllers’ DIP switches. To allow communication there must be one, and only one, master on each network. This is arranged by always giving the master address No. 125. If there is only one gateway on the network, it is given address 125.
Communication setup. Setup of communication “Communication setup” The menu gives access to the following three submenus. 1) Router (Routing) Before the router function is set, it is necessary to know the principle of how the messages are circulating between the different units. This principle is explained in Appendix A. PC: See "a" Modem: See "b" TCP: See "c" “Edit line” “Add line” “Delete line” “Lower limit” “Upper limit” “Port no.
b) Modem Display and setting of the “Address” field for a selected line in the router table. Selection of port number = 1: Address number of the unit the datagram is to be sent to in the network is indicated here 2: The telephone number the modem is to call is indicated here. “Telephone number” Acess display “______________x” The actual telephone number for the selected line in the router table. The telephone number may consist of up to max. 30 significant digits composed of figures and modem codes.
2) RS232 Port (PC Port) The setup depends on the setting in the gateway type: PC “RS 232 Speed” Display of the communication speed on the RS 232 line, and access display for settings. “Change speed” The required communication speed is set here. 1: 1200 Baud 2: 2400 Baud 3: 4800 Baud 4: 9600 Baud (factory setting) 5: 19200 Baud 6: 38400 Baud Re selection of communication speed, see the PC manual/software application manual.
3) LON Port The function defines a valid address range for controllers on the LON bus. The function can also replace the activation of menu O04 in all EKC controllers as well as activation of ”Service pin” in an AK 2 controller. Settings must be terminated through activation of BOOT-Gateway – Press ENTER. Address range The total address range for the connected controllers is from 1 to 120. Part of the range must be assigned to the LON bus. The remaining part is used by the DANBUSS.
Appendix A Routing This section contains a more detailed description of the router setting on page 27. General The DANBUSS system is a so-called compact coupled network. This means that information is transmitted through the system as single messages, also referred to as datagrams. To ensure that the datagrams reach the correct receivers in systems with many connected units, the transmitter must enter the receiver’s address in the datagram.
Appendix A - continued A router table may have a varying number of lines. In the example shown below there is one line. The table always consists of four fields when operation takes place with AKA 21: “Lower Limit”, “Upper Limit”, “Port No.”, and “Address”. 1 2 3 4 Lower limit Upper limit Port No. Address/ Telephone no/ IP Address 1 1 2 In principle the fields indicate the following: Fields 1 and 2: a group of units capable of receiving / sending a message.
Appendix A - continued Function When an AKA 245 receives a datagram that has to be re-transmitted to an AKC controller, for example, the gateway checks its router table to see where this AKC is placed. It is either placed in the same network as the gateway, or it is placed in another network. In the former case, the gateway can send the datagram directly to the final receiver. In the latter case, the gateway must send the datagram to another AKA 245 which will then re-transmit the datagram.
Appendix A - continued The PC will now send a message to the AKC unit which is addressed 5:2. The datagram is first sent to the PC gateway which checks in its router table to see where the datagram has to go. In checking the router table the PC gateway will look for the line in the table where the receiver’s network are contained. This requirement has been fulfilled by line 2, as it indicates the network No. 5. After the “Port No.” field has been read, the datagram is directed out of gate 1 which is DANBUSS.
Appendix B Repeat routines for alarm handling Depending on who has been selected to receive alarms, AKA 245 will have the following repeat routines if it cannot get in touch with the receivers: Setting of “AKA send alarm to”: “System address NNN:AAA” If an alarm message cannot be delivered within five minutes, it will be retransmitted every fifth minute until it can be delivered. If more alarms are received before the oldest alarm is delivered, nothing is done about it. Alarm No.
Appendix C Data collection takes up this much room When a log is established in an AKA 245 master gateway, room is set aside for data. Just how much room is reserved is determined by various parameters. The amount of room that will be reserved can be seen when new logs are established. Example: Only Food Safety logs are collected. If six parameters from 20 controllers with one hour time interval are logged, the gateway will have a storage capacity of 540 hours (22½ days and nights) which is 48.
Appendix D Terminology Address All units in a network are given an address. The address only concerns the network in which the unit is mounted. In each network there must only be one unit with the same address. Addresses in the range 1 - 125 can be assigned (except 124). Baud Unit indicating data communication speed. DANBUSS A data communication system developed by Danfoss A/S for communication between units.
Menu survey AKA 245 40 Manual *1) For PC gateway only *2) For modem gateway only /TCP/IP Appendix E RS8DT102 © Danfoss 09/2004 AKA 245
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Manual RS8DT102 © Danfoss 09/2004 AKA 245
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Manual RS8DT102 © Danfoss 09/2004 AKA 245 RC-ET Danfoss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice. This also applies to products already on order provided that such alternations can be made without subsequential changes being necessary in specifications already agreed. All trademarks in this material are property of the respecitve companies.
