Maxon ACC-513 User manual

ACC-513 / ACC-514
(GMSK / FFSK Modem for SD-160 Series)
Technical Manual
Rev 0.0
Jul./23/2003
Maxon Telecom Co., Ltd

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Contents
1. Introduction............................................................................... 4
2. Technical Specification............................................................. 5
2.1. Specification for ACC-513............................................................. 5
2.2. Specification for ACC-514............................................................. 6
3. Installation of ACC-513/ACC-514 ........................................... 7
4. System Application................................................................. 10
4.1. Fixed applications.........................................................................10
4.2. Mobile Applications...................................................................... 12
5. Operation ................................................................................ 13
5.1. Serial interface .............................................................................. 13
5.2. Configuring the SD-160 ...............................................................16
6. Understanding Modem Option................................................ 19
6.1. Modem Select ................................................................................ 19
6.2. System Option 1............................................................................ 20
6.3. System Option 2............................................................................ 21
6.4. System Option 3............................................................................ 22
7. Modem Operation Explained.................................................. 23
7.1. Auto Mode.....................................................................................23
7.1.1. Flow Control ........................................................................................... 23
7.1.2. Software flow control.............................................................................. 24
7.1.3. Hardware flow control ............................................................................ 24
7.1.4. None (No flow control)........................................................................... 26
7.2. Dumb Mode................................................................................... 27
7.3. Test Mode ......................................................................................27
7.4. Operating Diagram ......................................................................28

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8. Example of Operation Test ..................................................... 30
8.1. Example of using Hyper Terminal..............................................30
9. Pin-out chart for ACC-513/514............................................... 40
9.1. Pin-out for ACC-513 .................................................................... 40
9.2. Pin-out for ACC-514 .................................................................... 41
10. product version information.................................................. 42
10.1. Version information....................................................................42

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1. Introduction
The ACC-513 and ACC-514 are internal option-modems, which are applied to the SD-
160 series to increase capability for data application. The goal of an internal modem is
to improve the efficiency for data transmission and provide maximum flexibility for user
application. The most obvious method of increasing the data efficiency is to maximize
the data signaling speed in the limited channel bandwidth. But, FSK, called direct FM
modulation, has a very wide transmission bandwidth requirement. To solve this problem,
a GMSK(Gaussian Filtered Minimum Shift Keying) internal option-board can be used
Generally a data application can not be directly applied in an audio system (Voice)
Because of its spectra characteristic. The spectra of data has a wider and bandwidth
than audio. So, a direct application of data is not matched with audio system (Voice) and
its application. For instance, if a sub-audio(Tone) SQ system is applied to a data
application, its data frequency spectra will conflict with that of sub-audio tones.
Moreover, the inputted data is filtered by the audio filter resulting in a broken data
transmission. To overcome these problems and provide maximum flexibility, an
FFSK(Fast Frequency Shift Keying) internal option-board modem can be used.
Our internal modem option boards consist of a Slave MCU, Modem IC, and extra
circuitry. These option-boards directly communicate with DTE (Data Terminal
Equipment) to send and receive the meaningful data through the DB-15 connector to
the digital board of the SD-160. These modems are designed to accept RS232 serial
data format and are also capable of high speed wireless data-transmission between two
or more devices. To cope with various applications the SD-160 can be controlled by
automatically or manually. In automatic control the SD-160 will transmit simply by
automatically sending data. The data to be transmitted is automatically stored while the
transmitter is turned on. Before the data is transmitted, a preamble sequence is
transmitted to synchronize the receiving modem. The data is placed in data blocks
(packets) with header and end data information added. In manual control, when the SD-
160 receives data from DTE, the data communication process is almost similar to the
auto mode except that transmission is controlled by a control signal such as PTT or
RTS.

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2. Technical Specification
2.1. Specification for ACC-513
Modulation type : Modified GMSK
Maximum RF Baud rate : 4800 for 12.5KHz channel spacing and 9600 for
25KHz channel spacing
(Programmable, see below table)
Data Sensitivity : below –113dBm for 1 in 100 error rate
Method for elimination of DC offset : Data scrambling
Data input/output : RS232
RS232 Baud input rate : follow the RF Baud rate (see below table)
Number of Data Bit : 8 bits
Parity : None
Number of Stop Bit : 1 bit
Data flow control : None,
Software(Xon/Xoff),
Hardware(RTS/CTS) (Programmable)
Tx forcing mode : Configures the modem to transmit regardless of
squelch state
Data Block (Packet) size : Programmable from 16bytes to 8192bytes by
multiple of 16bytes increments. To provide
maximum flexibility, the packet doesn’t include
additional bits for error detection and
correction. We recommend that User adds their
own methods for error detection/correction.
Channel Space DTE Baud Rate Modem Baud Rate
Narrow (12.5KHz) 4800 4800
4800 4800
Standard (25KHz)
9600 9600
Table 2.1. Available Baud rate for GMSK modem

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2.2. Specification for ACC-514
Modulation type : FFSK
Maximum RF Baud rate : 2400 for 12.5KHz channel spacing and 4800 for
25KHz channel spacing
(Programmable, see below table)
Data Sensitivity : below –110dBm for 1 in 100 error rate
Mark /Space tone freq.
(for each available RF Baud rate)
: 1200Hz (M) / 1800Hz (S) at 1200bps
1200Hz (M) / 2400Hz (S) at 2400bps
2400Hz (M) / 4800Hz (S) at 4800bps
Data input/output : RS232
RS232 Baud input rate : follow the RF Baud rate (see below table)
Number of Data Bit : 8 bits
Parity : None
Number of Stop Bit : 1 bit
Data flow control : None, Software(Xon/Xoff),
Hardware(RTS/CTS) (Programmable)
Tx forcing mode : Configures the modem to transmit regardless of
squelch state
Data Block (Packet) size : Programmable from 16bytes to 8192bytes by
multiple of 16bytes increments. To provide
maximum flexibility, packet doesn’t include
additional bits for error detection and
correction.
We recommend that the User adds their own
methods for error detection/correction.
Channel Space DTE Baud Rate Modem Baud Rate
1200 1200 Narrow (12.5KHz)
2400 2400
1200 1200
2400 2400
Standard (25KHz)
4800 4800
Table 2.2. Available Baud rate for FFSK modem

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3. Installation of ACC-513/ACC-514
To install ACC-513/ACC-514 into the SD-160, this section explains step-by-step of
how to disassemble the radio, install the ACC-513/ACC-514 and reassemble the radio.
Important
Before disassembling and reassembling the radio, wear a conduction wrist strap to
prevent any components on its main board from being damaged by electrostatic
discharge.
Opening the Upper Cover :
1. Unfasten the four mounting screws
located on the bottom cover of the
radio.
Figure 3.1. Loosing the four mounting screws
2. Open slowly the upper cover from the side of
power connector.
Caution : Do not open the upper cover from
the side of DB-15 connector
Figure 3.2. Opening the upper cover

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Installation of ACC-513/514 :
1. Align 6-pin Header of ACC-513/514 to 6-pin
socket on digital B’D and then push header into
socket
2. Align the 14-pin Molex female connector of
ACC-513/514 to its male connector on the
digital B’D.
3. Attached the ACC-513/514 to the digital B’D
by pushing down.
Figure 3.3. Alignment of ACC-513/514
Figure 3.4. Enlarged drawing
Figure 3.5 Installation of ACC-
513/514

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Closing the Upper Cover :
1. Align the upper cover with the bottom cover.
2. Close the upper cover.
Figure 3.6. Closing the upper cover
3. Screw down the bottom cover of
the radio.
Figure 3.7. Inserting the four mounting screws

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4. System Application
The SD-160 is a flexible data radio transceiver intended for a wide variety of
applications. The basic radio data applications may be divided into several categories,
examples of these are :
 Point to point telemetry (Data logging system)
 Tele-command and tele-control to / from outstations or machinery
 Automatic irrigation system
 Job allocation and status reporting
 Automatic location reporting / polling
Typical function specific systems may include the following :
4.1. Fixed applications
1. Control point to multiple outstation tele-control. Used for control and exception
reporting in water pumping stations and other similar situations. (See Figure 4.1.)
Control Point
Power Supply
Commuication
Interface Cable
Com1
maxon
Antenna
SD-160
Com2
Radio ControlData In/Out
Micro-
Controller
SD-160
To / From
Equipment
Remote Site 1
maxon
+12V PSU
Micro-
Controller
SD-160
To / From
Equipment
Remote Site 1
maxon
+12V PSU
Host
Computer
Figure 4.1. Tele-control Application