Maxon ACC-513E User manual
ACC-513E/ACC-514E
(GMSK/FFSK Modem, SD-170E Series)
Technical Manual
Rev 1.0
July 17, 2013
Maxon Telecom Co., Ltd
Contents
1. Introduction...............................................................................4
2. Technical Specification............................................................. 5
2.1. Specification for ACC-513E............................................................5
2.2. Specification for ACC-514E............................................................6
3. Installation of ACC-513E/ACC-514E....................................... 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-170E ..............................................................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
8. Example of Operation Test..................................................... 30
8.1. Example of using Hyper Terminal.................................................. 30
9. Pin-out chart for ACC-513E/514E.......................................... 40
9.1. Pin-out for ACC-513E ..................................................................40
9.2. Pin-out for ACC-514E ..................................................................41
10. Product version information.................................................. 42
10.1. Version information.........................................................................42
1. Introduction
The ACC-513E and ACC-514E are optional accessories that can be installed into the SD-170E
series radios to improve capability for data applications. 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 cannot be directly applied in an audio system (Voice)
because of its spectra characteristic. The spectra of data has a wider 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-170E. 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-170E can be controlled by
automatically or manually. In automatic control the SD-170E 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
a
uto mode except that transmission is controlled by a control signal such as PTT or RTS.
2. Technical Specification
2.1. Specification for ACC-513E
Modulation type: Modified GMSK
Maximum RF Baud rate: 4800 (12.5 KHz) channel spacing and 9600 (25 KHz) 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 the
users add their own methods for error detection/correction.
Table 2.1. Available Baud rate for GMSK modem
2.2. Specification for ACC-514E
Modulation type: FFSK
Maximum RF Baud rate: 2400 (12.5 KHz) channel spacing and 4800 (25 KHz) 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 16
bytes increments. To provide maximum flexibility, packet
doesn’t include additional bits for error detection and correction.
We recommend that the users add their own methods for
error detection/correction.
Table 2.2. Available Baud rate for FFSK modem
3. Installation of ACC-513E/514E
This section explains step-by-step how to disassemble the SD_170E radio, install the ACC-
513E/514E, 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. Unscrew the four mounting screws located on the top cover of the radio.
2. Remove the lid.
Installation of ACC-513E/514E:
1. Install the modem by aligning both sets of header pins into the corresponding sockets
located on the digital board of the radio. Press firmly into place.
Closing the Upper Cover :
1. Align the upper cover with the bottom cover.
2. Close the upper cover. Install and tighten the 4 screws.
4. System Application
The SD-170E 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.)
Figure 4.1. Tele-control Application
2. Point to point telemetry using FFSK or GMSK modulation with RS232 control via a
micro-controller. User applications for this may include remote control data links
such as control of a remote paging transmitter or single direction status reporting or
data flow (see Figure 4.2.) from a gas pipeline monitoring station.
Figure 4.2. Telemetry Application
3. Multiple remote sites to control irrigation system (see Figure 4.3.)
Figure 4.3. Irrigation equipment control Application
4.2. Mobile Applications
4. Local area mobile system for job allocation and status reporting to and from taxis.
(see Figure 4.4).
Figure 4.4. Job allocation and status reporting Application
5. Marine data communications for ports / harbors and inland waters allowing GPS
navigation information to be relayed from vehicle or vessel to a control point.
Figure 4.5. Vehicle / Vessel Data Application
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