Contec RP-COM(FIT)H User manual

F&eIT Series
RS-232C-Ethernet Media Converter
RP-COM(FIT)H
RS-232C-Ethernet Media Converter PoE
Conform
RP-COM(FIT)H-AF
User’s Manual
CONTEC CO.,LTD.

RP-COM(FIT)H, RP-COM(FIT)H-AF 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
[RP-COM(FIT)H or RP-COM(FIT)H-AF] ...1
- First Step Guide …1
- CD-ROM [F&eIT Series Setup Disk] *1…1
- Rubber feet ...4
- Piece of Velcro ...2 set
- Power connector ...1
*1 The CD-ROM contains various software and User’s Manual (this manual)
First step guide
CD-ROM
[F&eIT Series Setup Disk]
x 4 x 2
Power connector
Rubber feet Piece of Velcro
RP-COM-H
POWER COM
MODE
ID
10 - 30
Vi+
Vi -
FG
RS-23 2C
10/100M
ACT
LINK
VDC
0
8
F
7
C
4
B
3 6
E
5
D
A
2
9
1
Module

ii RP-COM(FIT)H, RP-COM(FIT)H-AF
Copyright
Copyright 2005 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.

RP-COM(FIT)H, RP-COM(FIT)H-AF 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
Support Software.............................................................................................................................. 2
Cable/Connector (Option) ............................................................................................................ 3
Accessories (Option)..................................................................................................................... 3
Customer Support.................................................................................................................................... 4
Web Site ........................................................................................................................................... 4
Limited Three-Years Warranty............................................................................................................... 4
How to Obtain Service............................................................................................................................ 4
Liability ................................................................................................................................................... 4
Safety Precautions ................................................................................................................................... 5
Safety Information ........................................................................................................................... 5
Handling Precautions ....................................................................................................................... 5
Caution on maintenance................................................................................................................... 6
Environment ..................................................................................................................................... 7
Inspection ......................................................................................................................................... 7
Storage .............................................................................................................................................. 7
Disposal ............................................................................................................................................ 7
2. Module Nomenclature and Settings 9
Nomenclature of Module Components .................................................................................................. 9
LED indicator .......................................................................................................................................... 9
MODE Switch ....................................................................................................................................... 10
ID Switch............................................................................................................................................... 11
Input-Output Interface........................................................................................................................... 12
3. Explanation in Mode of Operation 13
Virtual COM Mode ............................................................................................................................... 13
Through Mode....................................................................................................................................... 14
Modem Mode ........................................................................................................................................ 16

iv RP-COM(FIT)H, RP-COM(FIT)H-AF
4. Installation and Connection 19
Installation Method................................................................................................................................19
Mounting on a Device Module ......................................................................................................19
Mounting on a DIN Rail.................................................................................................................22
Table Top Installation ....................................................................................................................24
Connection .............................................................................................................................................25
Cable Connection ...........................................................................................................................25
Connection of a Power Supply.......................................................................................................26
5. Setup 29
Setup Procedures ...................................................................................................................................29
Setup Utility...........................................................................................................................................29
6. SNMP Agent Functions 31
SNMPc Overview ..................................................................................................................................31
MIB Support ..........................................................................................................................................31
Control Using SNMPc...........................................................................................................................32
Building-in to SNMPc ...........................................................................................................................33
MIB Database Updates..........................................................................................................................33
7. Troubleshooting 35
When Communication Fails...........................................................................................................35
When SNMP Connections Fail ......................................................................................................35
When the RP-COM(FIT)H, RP-COM(FIT)H-AF Will Not Start ................................................35
8. Appendix 37
System Reference ..................................................................................................................................37
Product Specifications....................................................................................................................37
External Dimensions ......................................................................................................................39
Memory register.....................................................................................................................................40
Differences between the RP-COM(FIT)GY, RP-COM(FIT)H and RP-COM(FIT)H-AF ..............43

1. Before Using the Product
RP-COM(FIT)H, RP-COM(FIT)H-AF 1
1. Before Using the Product
This chapter provides information you should know before using the product.
About the Module
RP-COM is a media converter that converts serial communication (RS-232C) to Ethernet
communication. It allows the cable distance to be extended from the limit of the serial communication
cable length (15m) to the Ethernet cable length as well as wiring to be reduced. Moreover, RP-COM
has three different operating modes: the Penetration Mode and Modem Mode in addition to the Virtual
COM Mode, used as the standard COM operating mode.
This product is upwardly compatible with the current RP-COM(FIT)GY. Stacking an add-on device
module *1 with the product enables more channels to be available (RS-232C) and also more functions
to be extended (RS-422A/485).
It supports wide input power supply (10 - 30VDC), allowing two types of power supplies (5VDC and
PoE *2) to be selected depending on the usage and environment.
Please read this manual carefully before performing system configuration such as setting switches or
connecting to external devices. For information about how to use the software, refer to the Help
section on the attached CD-ROM.
*1 RS-232C 2ch communication module : COM-2(FIT)GY
Isolated RS-422A/RS-485 1ch communication module : COM-1PD(FIT)GY
*2 IEEE 802.3af-defined technology that supplies power from a LAN cable. PoE enables flexible layout, regardless
where the power supply is.
Features
Two types of power supplies available
RP-COM(FIT)H : Corresponding to the wide input power supply (10 - 30VDC)
RP-COM(FIT)H-AF : 5VDC and PoE supporting the use of IEEE802.3af-compatible devices,
enabling power to be supplied from UTP cables *1
Three operating modes selectable, depending on the usage
Virtual COM Mode : Can be used like the standard COM ports of a PC (max. 32 ports)
Through Mode : Can extend the distance between devices without changing settings or
applications of each device (max. 254 pairs)
Modem Mode : Creates communication programs capable of communications between
multiple terminals (N:N, max. 254 terminals)
Up to 7 channels available for RS-232C (when three COM-2(FIT)GY’s are added)
Add-on device modules [COM-2(FIT)GY] (for RS-232C 2ch) and [COM-1PD(FIT)GY] *2
(for RS-422A/RS-485 1ch) can be freely combined to allow up to three units to be added for extension

1. Before Using the Product
2RP-COM(FIT)H, RP-COM(FIT)H-AF
DHCP client function
Setup utility provided for easier device setup
RS-232C supports up to 921.600bps (Serial communication section)*3
The wired LAN can be 10BASE-T or 100BASE-TX (Ethernet section)
Provided a 35mm DIN rail attachment
*1 For supplying power from UTP cables, it is recommended to connect to our POW-CB30(af) or
POW-CBM4(af).
*2 The multi-drop function is not supported in COM-1PD(FIT)GY.
*3 The speed may be affected by the party on the other side of the connection and the cable length.
Support Software
Serial communication Media Converter Software (CD-ROM) (bundled)
Includes a utility program for device setup and a virtual COM driver for Windows. For more details, refer to the
Help section on the attached CD-ROM.
Setup utility :
- Automatically detects RP-COM(FIT)H and RP-COM(FIT)H-AF on the network upon startup.
- Can set the device for the operating mode (Virtual COM Mode, Penetration Mode, Modem Mode), Device ID, IP
address, subnet mask, etc.
Virtual COM Driver :
- Software allowing devices in our serial communication media converter series to be used like the COM ports of a
PC (standard COM) in the Windows environment.
- For the Windows OS standard, the driver supports communication functions such as CreateFile( ),WriteFile( ),
ReadFile( ) and SetCommState( ). It also supports the communication control of Visual Basic (MS Comm).
< Operating environment >
OS *1 Windows Vista, XP, 2000, Me, 98
*1 When the virtual COM driver is used in Windows 98/Me, COM ports cannot be extended by an add-on device
module stacked with RP-COM(FIT)H or RP-COM(FIT)H-AF.

1. Before Using the Product
RP-COM(FIT)H, RP-COM(FIT)H-AF 3
Cable/Connector (Option)
RS-232C D-SUB9pin strait cable (1.8m) : RSS-9M/F
RS-232C D-SUB9pin cross cable (1.8m) : RSC-9F
RS-232C connector conversion straight cable (25M→9F, 1.8m) : RSS-25M/9F
RS-232C connector conversion cross cable (25F→9F, 1.8m) : RSC-25F/9F
9pin D-SUB(Male) connector 5set : CN5-D9M
9pin D-SUB(Female) connector 5set : CN5-D9F
Accessories (Option)
< Add-on device modules >
RS-232C 2ch Communication Module : COM-2(FIT)GY
Isolated RS-422A/485 1ch Communication Module : COM-1PD(FIT)GY
< Accessory for the RP-COM(FIT)H >
AC adapter (input : 90 - 264VAC, output : 12V 1A) : POA201-10-2
< Accessory for the RP-COM(FIT)H-AF >
AC adapter (input : 90 - 264VAC, output : 5VDC 2.0A) : POA200-20-2
AC-DC Power Supply Unit (input : 85 - 132VAC, output : 5VDC 3.0A) : POW-AD13GY
AC-DC Power Supply Unit (input : 85 - 264VAC, output : 5VDC 2.0A) : POW-AD22GY
DC-DC Power Supply Unit (input : 10 - 30VDC, output : 5VDC 3.0A) : POW-DD10GY
DC-DC Power Supply Unit (input : 30 - 50VDC, output : 5VDC 3.0A) : POW-DD43GY

1. Before Using the Product
4RP-COM(FIT)H, RP-COM(FIT)H-AF
Customer Support
CONTEC provides the following support services for 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 Three-Years Warranty
CONTEC products are warranted by CONTEC CO., LTD. to be free from defects in material and
workmanship for up to three years 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
RP-COM(FIT)H, RP-COM(FIT)H-AF 5
Safety Precautions
Understand the following definitions and precautions to use the product safely.
Safety Information
This document provides safety information using the following 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.
Handling Precautions
CAUTION
- 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 - 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 -
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 unit to impact or bend it.
- To prevent contact malfunction, please do not touch the metallic pins on the external module
connector.

1. Before Using the Product
6RP-COM(FIT)H, RP-COM(FIT)H-AF
- 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.
- The specifications of this product are subject to change without notice for enhancement and quality
improvement.
Even when using the product continuously, be sure to read the manual and understand the contents.
- Do not modify the product. CONTEC will bear no responsibility for any problems, etc., resulting
from modifying this product.
- Regardless of the foregoing statements, CONTEC is not liable for any damages whatsoever
(including damages for loss of business profits) arising out of the use or inability to use this
CONTEC product or the information contained herein.
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
Caution on maintenance
Clean the RP-COM(FIT)H, RP-COM(FIT)H-AF by wiping lightly with a soft cloth moistened with
water or a cleaning solution. Take care to avoid the use of benzene, thinners or other volatile solutions
which may cause deformation or discoloration.

1. Before Using the Product
RP-COM(FIT)H, RP-COM(FIT)H-AF 7
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
Operating 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.
RP-COM-H
MODE
10 - 30
Vi+
Vi -
FG
RS-232C
10/100M
ACT
LINK
VDC
ID
0
4
5
6
7
9
C
F
8
COMPOWER
0
8
F
7
C
4
B
3
6
E
5
D
A
2
9
1
- Check that the ventilation slit has no obstruction and
has no dust or foreign matter adhering.
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.

1. Before Using the Product
8RP-COM(FIT)H, RP-COM(FIT)H-AF

2. Module Nomenclature and Settings
RP-COM(FIT)H, RP-COM(FIT)H-AF 9
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.
RP-COM-H
MODE
10 - 30
Vi+
Vi -
FG
RS-232C
10/100M
ACT
LINK
VDC
ID
0
4
5
6
7
9
C
F
8
COM
POWER
RP-COM-H-AF
MODE
ID
Vi+
Vi -
FG
RS-232C
ACT
LINK
5VDC
10/100M PoE
COM
POWER
RP-COM(FIT)H RP-COM(FIT)H-AF
0
8
F
7
C
4
B
3
6
E
5
D
A
2
9
1
0
8
F
7
C
4
B
3
6
E
5
D
A
2
9
1
LED indicator
UTP connector
FG
LED indicator
MODE switch
RS-232C connector
ID switch
Power supply
input connector
LED indicator
Power supply
input connector
UTP connector
FG
LED indicator
MODE switch
RS-232C connector
ID switch
Figure 2.1. Nomenclature of Module Components
CAUTION
Do not block the ventilation vents as this may result in damage or malfunction due to overheating.
LED indicator
Table 2.1. LED Display
- During normal operation
Name State Indicator
Flashing Startup, or startup error
POWER
On Operating
COM Flashing Sending or receiving COM data
- Others
Name State Indicator
Flashing 2 times Initialization error
POWER
Flashing 3 times Firmware writing error
POWER
COM
All flashing at
the
same time
Firmware writing in progress

2. Module Nomenclature and Settings
10 RP-COM(FIT)H, RP-COM(FIT)H-AF
MODE Switch
This sets or initializes the operating mode for the RP-COM(FIT)H, RP-COM(FIT)H-AF. The factory
default setting is that the MODE switch setting is used and all switches are set to OFF.
You can use the MODE switch to change the operating mode from the factory default setting to your
desired mode.
For detailed settings, use the utility softwarel.
* Note that it has the meaning only in case of the ID switch value described later being 0 - E.
Table 2.2. MODE Switch
- < Setting the MODE switch before power-on and then turning on the power >
Item Descri
p
tion
Operating mode
Set the operating mode
SW1 SW2 O
p
eratin
g
mode
OFF
OFF
Selected i
n
"
Through Mode
"
.
OFF ON Selected in "Modem Mode".
ON OFF Selected in "Virtual COM Mode".
ON ON Not used
- < Setting the MODE switch after power-on >
Item Description
Initialization Restore the RP-COM(FIT)H, RP-COM(FIT)H-AF to its factory default
settings.
When SW1 is turned on during normal operation after power-on, the
POWER light and the LED of COM start flashing. Turning the switch OFF
while the LEDs are still blinking (approx. 3 seconds) restores all settings to
their factory default values when the module is next restarted.
* Wait until the POWER and COM LEDs have gone back to their normal
states before rebooting or turning off the power.

2. Module Nomenclature and Settings
RP-COM(FIT)H, RP-COM(FIT)H-AF 11
ID Switch
This sets the device ID for the RP-COM(FIT)H, RP-COM(FIT)H-AF.
The setting range is 0 - E (0 - 14), but the ID can be set in the range 0 - 254 by software.
Note that device ID F (15) means “Terminal Mode”.
The factory default setting is that the ID switch setting is used and the device ID is set to “0”.
ID
Factory setting
0
1
2
3
4
5
6
7
9
A
B
C
D
E
F
8
(ID 0)
Figure 2.2. ID Switch
0 - E : Device Number
F : Changes to system restoration mode.
Selected when carrying out maintenance on the product connected to Ethernet from the
setup utility

2. Module Nomenclature and Settings
12 RP-COM(FIT)H, RP-COM(FIT)H-AF
Input-Output Interface
RS-232C Connector
Table 2.3. RS-232C Port Pin Assignments
Connector type 9 pin D-SUB (Male)
1 5
9
6
No.4-40UNC
Inch screw
Pin No. Abbreviated
name Signal name Input-
Output Note
1 DCD Carrier detect Input Not used
2 RxD Received data Input
3 TxD Transmitted data Output
4 DTR Data terminal ready Output
5 SG Signal ground −
6 DSR Modem ready Input
7 RTS Request to send Output
8 CTS Clear to send Input
9 RI Ring indicator Input Not used
UTP Connector
Table 2.4. UTP Port Pin Assignments
Signal name
Pin No. RP-COM(FIT)H RP-COM(FIT)H-AF
8 Not used Used in PoE
7 Not used Used in PoE
6 RD- RD-
5 Not used Used in PoE
4 Not used Used in PoE
3 RD+ RD+
2 TD- TD-
1 TD+ TD+
8
7
6
5
4
3
2
1
Power Input Connector
Table 2.5. Power Input Connector Pin Assignments
Signal name
Pin No. RP-COM(FIT)H RP-COM(FIT)H-AF
3 10 - 30VDC input 5VDC input
2 GND GND
1 FG (frame ground) FG (frame ground)
3
2
1

3. Explanation in Mode of Operation
RP-COM(FIT)H, RP-COM(FIT)H-AF 13
3. Explanation in Mode of Operation
Virtual COM Mode
This mode allows the serial ports of the product to be controlled via Ethernet from the attached virtual
COM driver for Windows.
Up to 32 channels can be used between this product and the stacked add-on device module *1.
Applications already in operation and using RS-232C (or RS-422A/485 when adding
COM-1PD(FIT)GY) can be used without any changes.
Use of the setup utility enables to set the product and add-on device module. For information about
how to use the software, refer to the Help section on the attached CD-ROM.
*1 RS-232C 2ch communication module : COM-2(FIT)GY
Isolated RS-422A/RS-485 1ch communication module : COM-1PD(FIT)GY
HUB
RP-COM(FIT)H
PC
Ethernet
HUB
9II 8X 7X 6X 5X 4X 3X 2X 1X
RP-COM-H
MODE
10- 30
Vi+
Vi -
FG
RS-232C
10/100M
ACT
LINK
VDC
ID
4
7
9
C
8
COMPOWER
0
8
F
7
C
4
B
3
6
E
5
D
A
2
9
1
9II 8X 7X 6X 5X 4X 3X 2X 1X
(Exsample1)
RP-COM-H
MODE
10- 30
Vi+
Vi -
FG
RS-232C
10/100M
ACT
LINK
VDC
ID
4
7
9
C
8
COMPOWER
0
8
F
7
C
4
B
3
6
E
5
D
A
2
9
1
RP-COM(FIT)H
HUB
9II 8X 7X 6X 5X 4X 3X 2X 1X
Ethernet
HUB
9II 8X 7X 6X 5X 4X 3X 2X 1X
RP-COM-H
MODE
10- 30
Vi+
Vi -
FG
RS-232C
10/100M
ACT
LINK
VDC
ID
4
7
9
C
8
COMPOWER
0
8
F
7
C
4
B
3
6
E
5
D
A
2
9
1
CH0
CH1
RX TX
COM-2
CH0
CH0
CH1
CH1
Device
ID
RX TX
0
4
C
8
CH0
CH1
RX TX
CH0
CH1
RX TX
RP-COM(FIT)H
+ COM-2(FIT)GY
HUB
9II 8X 7X 6X 5X 4X 3X 2X 1X
(Example1) RP-COM(FIT)H can be used like "COM3 of the PC via Ethernet.
* It is same when RP-COM(FIT)H-AF is replaced to RP-COM(FIT)H.
(Example2) COM-2(FIT)GY can be used like "COM3", "COM4" and "COM5"
of the PC when stacked with more than one RP-COM(FIT)H via Ethernet.
* It is same when RP-COM(FIT)H-AF is replaced to RP-COM(FIT)H
and when COM-1PD(FIT)GY is replaced to COM2(FIT)GY, too.
(Exsample2)
PC
RS-232C device A
[Device ID = 1]
RS-232C device B
[Device ID = 1]
RS-232C device D
[Device ID = 3]
RS-232C device C
[Device ID = 2]
Figure 3.1. Virtual COM Mode
CAUTION
- When using the virtual COM driver on Windows 98/Me, COM ports cannot be extended by using
an add-on device module that is stacked with RP-COM(FIT)H or RP-COM(FIT)H-AF.
- To avoid any adverse effects on other LAN devices, set the IP address, subnet mask, and other
network parameters to appropriate values.
- When COM-1PD(FIT)GY is stacked with RP-COM(FIT)H or RP-COM(FIT)H-AF, half-duplex
communication is disabled.

3. Explanation in Mode of Operation
14 RP-COM(FIT)H, RP-COM(FIT)H-AF
Through Mode
In this mode, data is transferred without any change from a connected device.
A serial cable used for one-to-one connection of devices can be converted to Ethernet connection
without any changes. In this way, two units must be installed as a pair for the product and stacked
add-on device module*1. Up to 254 pairs can be installed on a single circuit. However,
communication is not possible between devices connected to the product and its stacked add-on device
module.
Existing applications that operate using RS-232C (or RS-422A/485 : when expanding
COM-1PD(FIT)GY) can continue to be used without any changes.
The Device ID is set by the rotary switch on the main unit or the setup utility. For the rotary switch,
the same value is set to the Device ID. For the setup utility, the device ID of the party on the other side
of the connection (other party’s Device ID) can be set.
It is also necessary to match the serial parameters of the serial devices to be connected to the product
and its stacked add-on device module by using the setup utility.
For information about how to use the setup utility, refer to the Help section on the attached CD-ROM.
*1 RS-232C 2ch communication module : COM-2(FIT)GY
Isolated RS-422A/RS-485 1ch communication module : COM-1PD(FIT)GY
CAUTION
- If using broadcasting, ensure that all RP-COM(FIT)H (or RP-COM(FIT)H-AF) units have different
device IDs.
- Device ID 255 is reserved for broadcast use.
- To avoid any adverse effects on other LAN devices, set the IP address, subnet mask, and other
network parameters to appropriate values.
- Although, existing application can generally continue to be used unchanged, note that they may not
operate correctly if particular RS-232C control procedures are used (see below).
(Example) - Baud rate changed during operation
- Hardware signals used for proprietary purposes other than flow control
- RI signal used
- When COM-1PD(FIT)GY is stacked with RP-COM(FIT)H or RP-COM(FIT)H-AF, half duplex
communication is disabled.

3. Explanation in Mode of Operation
RP-COM(FIT)H, RP-COM(FIT)H-AF 15
Ethernet
HUB
RP-COM(FIT)H
RP-COM-H
MODE
10- 30
Vi+
Vi -
FG
RS- 23 2 C
10/ 10 0M
ACT
LINK
VDC
ID
4
7
9
C
8
COMPOWER
0
8
F
7
C
4
B
3 6
E
5
D
A
2
9
1
RP-COM(FIT)H
RP-COM-H
MODE
10- 30
Vi+
Vi-
FG
RS- 23 2 C
10/ 10 0M
ACT
LINK
VDC
ID
4
7
9
C
8
COMPO W ER
0
8
F
7
C
4
B
3 6
E
5
D
A
2
9
1
9II 8X 7X 6X 5X 4X 3X 2X 1X
(Example1)
HUB
9II 8X 7X 6X 5X 4X 3X 2X 1X
(Example1) An Ethernet cable is used to extend the connection of RS-232C device A and RS-232C device B.
RS-232C (device A, device ID = 1) ←Connection to Ethernet (wired LAN) →RS-232C (device B, device ID = 1)
* It is same when RP-COM(FIT)H-AF is replaced to RP-COM(FIT)H.
RS-232C device A
[Device ID = 1] RS-232C device B [Device ID = 1]
(Exsample2) An Ethernet cable is used to extend the connection of RS-232C device C and RS-232C device E.
An Ethernet cable is used to extend the connection of RS-232C device D and RS-232C device F.
(Communication is disabled between directly stacked devices.)
RS-232C (device C, device ID = 1) ←Connection to Ethernet (wired LAN) →RS-232C (device E, device ID = 1)
RS-232C (device D, device ID = 2) ←Connection to Ethernet (wired LAN) →RS-232C (device F, device ID = 2)
* It is same when RP-COM(FIT)H-AF is replaced to RP-COM(FIT)H and when COM-1PD(FIT)GY is replaced
to COM2(FIT)GY, too.
HUB
RP-COM-H
MODE
10- 30
Vi+
Vi-
FG
RS-232C
10/100M
ACT
LINK
VDC
ID
4
7
9
C
8
COM
POW E R
0
8
F
7
C
4
B
3 6
E
5
D
A
2
9
1
RP-COM(FIT)H
+ COM-2(FIT)GY
RP- C OM - H
MODE
10- 30
Vi+
Vi-
FG
RS-232C
10/100M
ACT
LINK
VDC
ID
4
7
9
C
8
COMPOWER
0
8
F
7
C
4
B
3 6
E
5
D
A
2
9
1
CH0
CH1
RX TX
COM-2
CH0
CH0
CH1
CH1
Device
ID
RX TX
0
4
C
8
CH0
CH1
RX TX
CH0
CH1
RX TX
9II 8X 7X 6X 5X 4X 3X 2X 1 X
Ethernet
HUB
9II 8X 7X 6X 5X 4X 3X 2X 1X
RP-COM(FIT)H
+ COM-2(FIT)GY
CH0
CH1
RX TX
COM-2
CH0
CH0
CH1
CH1
Device
ID
RX TX
0
4
C
8
CH0
CH1
RX TX
CH0
CH1
RX TX
(Example2)
RS-232C device C
[Device ID = 1] RS-232C device D [Device ID = 2]
RS-232C device F
[Device ID = 2]
RS-232C device E
[Device ID = 1]
Figure 3.2. Through Mode