Contec F&eIT Series User manual

F&eIT Series
Isolated RS-422A/485 1ch
Communication Module
COM-1PD(FIT)GY
User’s Manual
CONTEC CO.,LTD.

COM-1PD(FIT)GY i
Check Your Package
Thank you for purchasing the CONTEC product.
The product consists of the items listed below.
Check, with the following list, that your package is complete. If you discover damaged or missing items,
contact your retailer.
Product Configuration List
- Module[COM-1PD(FIT)GY] …1
- First step guide …1
- CD-ROM [F&eIT Series Setup Disk] *1 …1
*1 The CD-ROM contains various software and User’s Manual (this manual)
Module
CH0
MODE
TERM
CH0
RX TX
Device
ID
COM-1 PD
12345678910
0
2
4
6
A
C
E
8
CD-ROM
[F&eIT Series Setup Disk]
First step guide

ii COM-1PD(FIT)GY
Copyright
Copyright 2003 CONTEC CO., LTD. ALL RIGHTS RESERVED
No part of this document may be copied or reproduced in any form by any means without prior written
consent of CONTEC CO., LTD.
CONTEC CO., LTD. makes no commitment to update or keep current the information contained in this
document. The information in this document is subject to change without notice.
All relevant issues have been considered in the preparation of this document. Should you notice an
omission or any questionable item in this document, please feel free to notify CONTEC CO., LTD.
Regardless of the foregoing statement, CONTEC assumes no responsibility for any errors that may
appear in this document nor for results obtained by the user as a result of using this product.
Trademarks
F&eIT is a registered trademark or trademark of CONTEC CO., LTD. Other company and product
names that are referred to in this manual are generally trademarks or registered trade trademark.

COM-1PD(FIT)GY iii
Table of Contents
Check Your Package............................................................................................................................ i
Copyright............................................................................................................................................ii
Trademarks .........................................................................................................................................ii
Table of Contents ..............................................................................................................................iii
1. BEFORE USING THE PRODUCT 1
About the Module............................................................................................................................... 1
Features........................................................................................................................................ 1
Customer Support............................................................................................................................... 2
Web Site....................................................................................................................................... 2
Limited One-Year Warranty............................................................................................................... 2
How to Obtain Service ....................................................................................................................... 2
Liability .............................................................................................................................................. 2
Safety Precautions .............................................................................................................................. 3
Safety Information....................................................................................................................... 3
Handling Precautions................................................................................................................... 4
Inspection..................................................................................................................................... 6
Storage......................................................................................................................................... 6
Disposal ....................................................................................................................................... 6
2. MODULE NOMENCLATURE AND SETTINGS 7
Nomenclature of Module Components .............................................................................................. 7
Setting a Device ID ............................................................................................................................ 7
Setup Method............................................................................................................................... 8
Setting Transmission Mode......................................................................................................... 9
Setting of Terminator ................................................................................................................ 10
LED Indicator................................................................................................................................... 11
3. CONNECTING TO AN EXTERNAL DEVICE 13
Interface Connector .......................................................................................................................... 13
How to Connect an Interface Connector................................................................................... 13
Types of Cable and Example Connections ......................................................................................14

iv COM-1PD(FIT)GY
4. FUNCTIONS 15
Communication Function .................................................................................................................15
Serial Data Transmission...........................................................................................................15
RS-422A/485 Control Lines......................................................................................................15
Send and Receive Data Buffers.................................................................................................15
Setting the Baud Rate ................................................................................................................16
Automatic RTS Control Functions............................................................................................18
Other Functions ................................................................................................................................ 18
Bus Isolation ..............................................................................................................................18
Surge Protection.........................................................................................................................18
5. USING THE MODULE 19
Compatible and Enhanced Modes....................................................................................................19
Operating under CPU-SB303-FIT....................................................................................................20
Details on I/O Ports and Registers ...................................................................................................23
Interrupt Vector Registers ................................................................................................................27
Using an Interrupt............................................................................................................................. 28
Examples........................................................................................................................................... 29
Compatible Mode ......................................................................................................................30
Enhanced Mode ......................................................................................................................... 33
6. SYSTEM REFERENCE 37
Block Diagram..................................................................................................................................37
Equivalence Circuit .......................................................................................................................... 38
Specification .....................................................................................................................................39
External Dimensions.........................................................................................................................40

1. Before Using the Product
COM-1PD(FIT)GY 1
1. Before Using the Product
This chapter provides information you should know before using the product.
About the Module
The COM-1PD(FIT)GY performs serial communication with an external device in compliance with
RS-422A/485, capable of serving as COM3 or COM4 of an F&eIT series microcontroller unit.
The module can also serve as an expansion COM port for a media converter [RP-COM(FIT)H,
RP-COM(FIT)H-AF, or FX-DS540-COM2].
Please read this manual carefully to create application programs and configure the system, such as
setting the switches and connecting it to external devices.
Features
- RS-422A/485 serial communication ports
- The communication lines are electrically isolated from the module.
- High-speed communication is supported at up to 921,600bps (115,200bps in compatible mode).
- A baud rate can be set by software.
- The module has 128-byte FIFO buffers for transmit and receive.
- Driver software is supplied to allow the serial ports to be used as standard Windows or Linux COM
ports. *1
- The data transfer mode (full duplex or half duplex) can be set by a switch.
- The board includes a 100Ωterminating resistor required for multi-drop (party line) connections.
The resistor can be inserted into the signal line by a switch.
- Surge protection is provided for each RS-422A/485 signal line.
- Up to three units can be added (at the time of enhanced mode) as expansion ports for micro
controller unit. *2
- Up to three units can be added as expansion ports for media converters [RP-COM(FIT)H,
RP-COM(FIT)H-AF, FX-DS540-COM2].
- Similar to other F&eIT series products, the system, in the module itself, incorporates a 35-mm DIN
rail mounting mechanismas a standard item. A connection to a controller module can be effected on
a lateral, stack basis in a unique configuration, which permits a simple, smart system configuration
without the need for a backplane board.
*1: When using it as the expansion port for micro controller unit
*2: Two units can be added at the time of compatible mode

1. Before Using the Product
2COM-1PD(FIT)GY
Customer Support
CONTEC provides the following support servicesfor you to use CONTEC products more efficiently and
comfortably.
Web Site
Japanese http://www.contec.co.jp/
English http://www.contec.com/
Chinese http://www.contec.com.cn/
Latest product information
CONTEC provides up-to-date information on products.
CONTEC also provides product manuals and various technical documents in the PDF.
Free download
You can download updated driver software and differential files as well as sample programs available in
several languages.
Note! For product information
Contact your retailer if you have any technical question about a CONTEC product or need its price,
delivery time, or estimate information.
Limited One-Year Warranty
CONTEC products are warranted by CONTEC CO., LTD. to be free from defects in material and
workmanship for up to one year from the date of purchase by the original purchaser.
Repair will be free of charge only when this device is returned freight prepaid with a copy of the original
invoice and a Return Merchandise Authorization to the distributor or the CONTEC group office, from
which it was purchased.
This warranty is not applicable for scratches or normal wear, but only for the electronic circuitry and
original modules. The warranty is not applicable if the device has been tampered with or damaged
through abuse, mistreatment, neglect, or unreasonable use, or if the original invoice is not included, in
which case repairs will be considered beyond the warranty policy.
How to Obtain Service
For replacement or repair, return the device freight prepaid, with a copy of the original invoice. Please
obtain a Return Merchandise Authorization Number (RMA) from the CONTEC group office where you
purchased before returning any product.
* No product will be accepted by CONTEC group without the RMA number.
Liability
The obligation of the warrantor is solely to repair or replace the product. In no event will the warrantor
be liable for any incidental or consequential damages due to such defect or consequences that arise from
inexperienced usage, misuse, or malfunction of this device.

1. Before Using the Product
COM-1PD(FIT)GY 3
Safety Precautions
Understand the following definitions and precautions to use the product safely.
Safety Information
This document providessafety information using thefollowing symbols to prevent accidents resulting in
injury or death and the destruction of equipment and resources. Understand the meanings of these labels
to operate the equipment safely.
DANGER DANGER indicates an imminently hazardous situation which, if not avoided, will
result in death or serious injury.
WARNING WARNING indicates a potentially hazardous situation which, if not avoided, could
result in death or serious injury.
CAUTION CAUTION indicates a potentially hazardous situation which, if not avoided, may
result in minor or moderate injury or in property damage.

1. Before Using the Product
4COM-1PD(FIT)GY
Handling Precautions
CAUTION
Take the following precautions when handling this module.
- Do not modify the module. CONTEC will bear no responsibility for any problems, etc., resulting
from modifying this module.
- Do not use or store the equipment in a hot or cold place, or in a place that is subject to severe
temperature changes. (Operating temperature range: 0 to 50°C)
- Do not use or store the equipment in a place subject to direct sunlight or near a heating device, such
as a stove.
- Do not use or store the equipment in a dusty or humid place. (Operating humidity range: 10 to
90%RH, no condensation)
- As this product contains precision electronic components, do not use or store in environments
subject to shock or vibration.
- Do not use or store the product near equipment generating a strong magnetic field or radio waves.
- If you notice any strange odor or overheating, please unplug the power cord immediately.
- In the event of an abnormal condition or malfunction, please consult the dealer from whom the
equipment was purchased.
- To avoid electric shock, please do not touch the system with a wet hand.
- Do not open the module casing. CONTEC will disclaim any responsibility for equipment whose
casing has been opened.
- To prevent damage, please do not subject the module to impact or bend it.
- To prevent contact malfunction, please do not touch the metallic pins on the external module
connector.
- The module contains switches that need to be properly set. Before using the module, please check
its switch settings.
- To avoid malfunction, please do not change the module switch settings in an unauthorized manner.
- "Do not operate the device module when the power for the Controller Module is on.
To avoid malfunction, please be sure to turn off the power for the Controller Module."
- Regarding “EMC Instruction Class A Notice and FCC Part 15 Class A Notice and VCCI Class A”
This product has acquired the above-mentioned standard.
However, a sufficient margin may not be secured for the standard. In this case, use a ferrite core
(SEIWA E04SR301334 or an compatible product) for both ends of the COM cable.
When attaching the ferrite core, coil it around once near the connector while leaving it open, and
then close it.
If a mouse is connected to your microcontroller, as a rider to the EMC Directive for a Class A
product, a ferrite core (SEIWA E04SR301334 or a compatible product) must be used for the mouse
cable.
When attaching the ferrite core, coil it around twice near the connector while leaving it open, and
then close it.

1. Before Using the Product
COM-1PD(FIT)GY 5
FCC PART 15 Class A Notice
This equipment has been tested and found to comply with the limits for a Class A digital device,
pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection
against harmful interference when the equipment is operated in commercial environment.
This equipment generates, uses, and can radiate radio frequency energy and, if not installed and
used in accordance with the instruction manual, may cause harmful interference to radio
communications. Operation of this equipment in a residential area is likely to cause harmful
interference at his own expense.
NOTE
Change or modifications not expressly approved the manufacturer can void the user's authority to
operate this equipment.
WARNING TO USER

1. Before Using the Product
6COM-1PD(FIT)GY
Environment
Use this product in the following environment. If used in an unauthorized environment, the module may
overheat, malfunction, or cause a failure.
Operating temperature
0 - 50°C
Humidity
10 - 90%RH (No condensation)
Corrosive gases
None
Floating dust particles
Not to be excessive
Inspection
Inspect the product periodically as follows to use it safely.
CH0
MODE
TERM
CH0 RX TX
Device
ID
COM-1PD
12345678910
0
1
2
3
4
5
6
7
9
A
B
C
D
E
F
8
*The ventilation slits are not covered,
and neither dust nor alien substance is attached to the ventilation slits
Storage
When storing this product, keep it in its original packing form.
(1) Put the module in the storage bag.
(2) Wrap it in the packing material, then put it in the box.
(3) Store the package at room temperature at a place free from direct sunlight, moisture, shock,
vibration, magnetism, and static electricity.
Disposal
When disposing of the product, follow the disposal procedures stipulated under the relevant laws and
municipal ordinances.

2. Module Nomenclature and Settings
COM-1PD(FIT)GY 7
2. Module Nomenclature and Settings
Nomenclature of Module Components
Figure 2.1. shows the names of module components. In the figure, the indicated switch settings
represent factory settings.
LED Indicator
Device ID
Interface connector
Transmission
mode terminators
CH0
MODE
TERM
CH0
RX TX
Device
ID
COM-1PD
12345678910
0
2
4
6
A
C
E
8
Figure 2.1. Names of module components
Setting a Device ID
Depending on the specific Device ID that is set, the COM-1PD(FIT)GY can be switched over between
the compatible mode and the enhanced mode.
Table 2.1 shows the relationship between Device IDs and the modes.
For a description of the compatible and enhanced modes, see Chapter 4, "Using the Module".
The factory setting is [0], in which the COM-1PD(FIT)GY can be used as a COM3 standard port.
CAUTION
The setup method in this document assumes the combination with a microcontroller. For the
combination with a media converter, read the manual for the media converter carefully for setup.

2. Module Nomenclature and Settings
8COM-1PD(FIT)GY
Setup Method
A device ID can be set by turning the rotary switch on the device face.
To set a device ID, turn the switch knob.
Device
ID Factory settings:
(Device ID = 0)
0
4
C
8
Figure 2.2. Setting a Device ID
Table 2.1. I/O Address
CH0
DeviceID I/O address(h) Interrupt Mode
0 03E8 - 03EF IRQ5 Compatible (COM3)
1 03E8 - 03EF Not Used Compatible (COM3)
2 02E8 - 02EF IRQ7 Compatible (COM4)
3 02E8 - 02EF Not Used Compatible (COM4)
4 01A0 - 01A7 IRQ5 Enhanced mode
5 01A0 - 01A7 IRQ7 Enhanced mode
6 02A0 - 02A7 IRQ5 Enhanced mode
7 02A0 - 02A7 IRQ7 Enhanced mode
8 9800 - 9807 IRQ9 Enhanced mode
9 9820 - 9827 IRQ5 Enhanced mode
A 9840 - 9847 IRQ7 Enhanced mode
B 9860 - 9867 Not Used Enhanced mode
C 0700 - 0707 IRQ9 Enhanced mode
D 0720 - 0727 IRQ7 Enhanced mode
E Reserved Reserved Reserved
F Reserved Reserved Reserved
CAUTION
If the model label on the main unit reads "Rev.D", Device ID No. C or D can be used for that product.
Please use it excluding Device ID No. 8, 9, A, B when using in the Windows environment.

2. Module Nomenclature and Settings
COM-1PD(FIT)GY 9
Setting Transmission Mode
The data transfer mode setting switch is used to switch between full duplex and half duplex and to
specify whether to use RTS/CTS in full duplex mode. Set the appropriate data transfer mode for the
device with which you arecommunicating. Bits 1 to 5 are used to set the data transfer mode. Always set
bit 6 is to OFF.
Setting Procedure
Table 2.2. Setting Transmission Mode
Transmission
mode
Setting
Half duplex
[Half] When there are RTS and CTS
When there are no
RTS and CTS
To connect RTS and CTS to
the other unit,
communication is available.
TXD is only used for data
transmission; the sending
and receiving modes should
be switched over using
the modem control
register.
Full duplex
[Full]
RTS
CTS
RTS
CTS
With above setting, RTS and
CTS are connected in the
board.
Communication is available
without wiring of RTS and
CTS.
Factory
setting
ON
1 3
2 456
7 9
810
ON
1 3
2 456
7 9
810
ON
1 3
2 456
7 9
810
CAUTION
Do not use with bits 1 and 2 both set ON as this may result in damage to the module.

2. Module Nomenclature and Settings
10 COM-1PD(FIT)GY
Setting of Terminator
The terminator setting switch controls whether or not a terminator is inserted into each signal line. Set
the terminators on or off in accordance with the devices with which you are communicating. The
terminators on the module are 100Ωresistors. See Figure 2.4 for details on how to use terminators in a
multi-drop (party line) connection.
Each bit in the switch corresponds to a different signal line: bit 7 for RxD, bit 8 for CTS, bit 9 for TxD,
and bit 10 for RTS.
Setting Procedure
If you wish to use a terminator of other than 100Ω, set the terminator switch OFF and insert an external
terminator.
Table 2.3. Setting of Terminator
Inserted Not inserted
Figure 2.3. A or D
(Both terminators
of the line)
Figure 2.3. B or C
(Other than both
terminators of the line)
Setting
[Term ON] [Term OFF]
Factory
setting
ON
1 3
2 4567 9
810
ON
1 3
2 4567 9
810
Terminator Terminator
(A) (D)
(C)
(B)
Figure 2.3. Party Line Connection
CAUTION
When the data transfer mode is set to half duplex, only set bit 9 ON. Communications may not
function if other bits are set ON.

2. Module Nomenclature and Settings
COM-1PD(FIT)GY 11
The figure below shows the circuit associated with the data transfer mode setting switch and terminator
setting switch.
TxD+
TxD-
RxD+
RxD-
CTS+
CTS-
RTS+
RTS-
RTS
DCD
DTR
DSR
RI
CTS
SIN
SOUT
162850
or Equivalent
Terminator
1/2W 100Ω
134562
79108
Termina tor
Data transmission
mode
Figure 2.4. Setting Switch Circuits
LED Indicator
RX: Indicates that the module is receiving serial data (green).
TX: Indicates that the module is transmitting serial data (green).

2. Module Nomenclature and Settings
12 COM-1PD(FIT)GY

3. Connecting to an External Device
COM-1PD(FIT)GY 13
3. Connecting to an External Device
Interface Connector
How to Connect an Interface Connector
When connecting the Module to an external device, you can use the supplied connector plug
CH0
MODE
TERM
CH0 RX TX
Device
ID
COM-1PD
12345678910
0
2
4
6
A
C
E
8
Connector used
- DELC-J9SAF-20L9 (Female Connector type)
(mfd.by JAE) equivalent
Applicable
- 17JE-23090-02(D8C) (Male Connector type) (mfd.by DDK)
- CN5-D9M(Male Connector type) (mfd.by CONTEC)
Lock nut: UNC#4-40(inch screw)
Figure 3.1. Connecting an interface connector and connectors that can be used
CH0
(9 pin D-SUB(Female))
1
2
3
4
5
6
7
8
9
Request to Send+ RTS+
Request to Send
- RTS -
Transmit Data+ TxD+
Transmit Data- TxD-
Signal Ground SG
CTS+ Clear to Send+
RxD+ Receive Data+
RxD
- Receive Data -
CTS - Clear to Send -
Figure 3.2. Signal Layout on the Interface Connector
CAUTION
- For TxD, RxD, and RTS, big numbered pins are + and small numbered pins are -.
For CTS, big numbered pins are - and small numbered pins are +. This is the opposite of the other
signals, but is not a misprint.
- The external metal frame (shell) of the connector is insulated from the unit, or not in contact with
any part of the unit. When grounding is required, for example, as data transfer remains unstable,
ground the remote device to the earth.

3. Connecting to an External Device
14 COM-1PD(FIT)GY
Types of Cable and Example Connections
The figures below show examples of how to connect the cable for the module.
The RS-422A/485 interface works based on a differential signal whereby the signal is carried by the
potential difference between two lines (+ and -). Using twisted pair cable is recommended to improve
resistance to noise.
RTS -
RxD -
TxD -
TxD+
RxD+
RTS+
CTS+
CTS
-
SG
RTS -
RxD -
TxD -
TxD+
RxD+
RTS+
CTS+
CTS
-
SG
External device
Figure 3.3. Example Connection RTS and CTS to a External Device in Full Duplex
External device
RxD -
TxD -
TxD+
RxD+
SG
RxD
-
TxD -
TxD+
RxD+
SG
Figure 3.4. Example Connection Oneself loop to RTS and CTS in Full Duplex
External device
TxD -
TxD+
SG
TxD
-
TxD+
SG
Figure 3.5. Example Connection in Half Duplex
CAUTION
If connecting between external devices and this board with faulty wiring, it will become the cause of
failure.

4. Functions
COM-1PD(FIT)GY 15
4. Functions
This section describes the functions of the module.
Communication Function
Serial Data Transmission
Sends and receives data in accordance with the RS-422A/485 standard.
The baud rate can be set independently in the range 2 - 921,600bps by software.
RS-422A/485 Control Lines
The module include the RTS+, RTS-, CTS+, and CTS- control lines.
The lines can be controlled or monitored by software from the application
Send and Receive Data Buffers
The module has a separate 128-byte send and 128-byte receive buffer.
The buffers operate as FIFO buffers and help reduce the load on the CPU for high-speed
communications or system operation.
The FIFO trigger size is a data buffer size that determines the timing of generating a hardware interrupt.
Increasing the FIFO trigger size decreases the number of times hardware interrupts occur for data
transmission and reception, thereby reducing the load on the CPU.
However, this delays the timing of transmitting data to the remote device and the timing of notifying an
application of data reception because actual transmission and reception take place after a certain amount
of data has been collected.
In contrast, decreasing the FIFO trigger size or disabling FIFO memory shortens the timing of data
transmission and reception but may increase the load on the CPU or miss some receiving data.
Since the FIFO trigger size is variable, adjusting it depending on the system results in optimum
performance.