QVS TV Converter Box IC 485S User Guide

RS-232  
RS-485  
INTERFACE CONVERTER  
IC-485S  
&
IC-485SI  
User’s Manual  
@Copyright 1994  
Manual part NO.PAPE-0075-200  
Printed in Taiwan 06/94  
International CO., LTD.  
 
PACKAGE CHECKLIST  
When you purchase this product, it should contain the  
following elements:  
x 1  
x 1  
l
l
l
IC-485S or IC-485SI Converter  
Power Adapter (DC9V, 200mA)  
IC-485S  
&
IC-485SI User’s Manual x 1  
Attention: To prevent electric shock caused by  
lightening, you must provide a ground  
path by connecting a wire from the  
Grounding Tab to the earth ground  
(for IC-485SI only).  
 
FUNCTION OVERVIEW  
IC-485S/IC-485SI  
1 FUNCTION OVERVIEW  
TABLE OF CONTENTS  
l-l INTRODUCTION  
............  
.......................  
1
1
1 FUNCTION OVERVIEW  
The IC-485S and IC-485SI are a series of a bi-di-  
rectional interface converters for RS-232 and RS-  
485. The IC-485SI has built-in isolators for high  
voltage (2OOOV) protection. With the IC-485 series,  
ic-485s & IC-485SI, it provides Point-to-Point,  
Multidrop and Simplex operations. The IC-485s  
provides an extra Monitoring function.  
l-l Introduction  
2
3
3
4
6
8
9
....................  
l-2 Specifications.  
...................  
2 INSTALLATION  
2- 1 Installation Procedure.  
2-2 Switch Function Description  
..............  
.........  
......................  
....  
3 OPERATION  
The IC-485 can be powered from the following two  
ways:  
3-l Point-to-Paint/4-Wire Full Duplex  
3-2 Point-to-Paint/2-Wire Half Duplex  
....  
1) a DC 9V, 2OOmA power adapter  
2) the pin #9 of the RS-232 connecter  
. . . . . . . 10  
3-3 Multidrop/4-Wire Full Duplex.  
3-4 Multidrop/2-Wire Half Duplex  
3-5 Simplex/Transmit, Receive Only.  
3-6 Monitoring (for IC-485s only)  
......  
....  
.....  
11  
12  
13  
14  
14  
15  
Two slide switches are used to configure its op-  
eration mode, contention control, and assignment of  
the RS-232. Following figure is the IC-485’s exter-  
nal view.  
. . . . . . . . . . . . . . . . . . . . . . . . . .  
4 OTHERS  
.........  
4- 1 Terminal Block Definition.  
........................  
Ter m in a l Block  
4-2 Self Test  
APPENDIX A  
16  
17  
18  
....................  
.........  
....  
TV Interference.  
Trouble Shooting  
RS-232 DCE/DTE Description  
Preventing Radio  
&
Figure l-l External View  
User’s Manual  
 
1
INSTALLATION  
IC-485S/IC-485SI  
INSTALLATION  
IC-485S/IC-485SI  
the RS-485 line signals (for IC-485S  
only).  
2-2 SWITCH F UNCTION DESCRIP TION  
Refer to the location of the SW1 and SW2, please see  
Figure 1- 1.  
SW2: Transmitting and Receiving mode selection  
Position 1: (TxON, RxON) means the IC-485 is  
always in transmitting mode and in re-  
ceiving mode.(using in Point-to-Point  
mode)  
IC-485S:  
Position 2: (TxRTS, RxRTS) means the K-485 is in  
transmitting mode while RTS signal is at  
high level and it is in receiving mode  
while RTS signal is at low level.(using  
in Multidrop mode)  
IC-485SI:  
Position 3:  
(TxRTS, RxON) means the IC-485 is  
always in receiving mode and it is in  
transmitting mode only while RTS sig-  
nal is at high level.(using in Multidrop  
mode to monitor the RS-485 line signals)  
SW 1: Device Mode Selection  
Position 1: DCE means the IC-485 is set at DCE  
mode and it must be connected to a DTE  
device.  
Note:  
DTE means Data Terminal Equipment.  
Position 2: DTE means the IC-485 is set at DTE  
mode and it must be connected to a DCE  
device.  
DCE means Data Communication  
Equipment.  
More detailed information, please refer  
to the Appendix.  
Position 3: Monitor means the IC-485S is set at  
monitor mode and it is used to monitor  
User’s Manual  
User’s Manual  
5
 
OPERATION  
OPERATION  
IC-485S/IC-485SI  
IC-485S/IC-485SI  
Simplex configuration means that more than two  
devices can be linked all together to communicate  
through many IC-485 devices. Its configuration is  
like the Multidrop’s, but the master device can talk  
only a n d the slaver devices can listen only.  
3 OPERATION  
The IC-485S  
&
IC-485SI supports 4 kinds of  
functions in 6 kinds of configurations. They are  
1. Point-to-Point  
4. M o n i t o r Mode( Fig. 3-6  
)
(for IC-485S only)  
Point-to-Point configuration means two devices  
which locate at two different places can be linked  
together to communicate through a couple of IC-485  
devices.  
Monitor configuration means a IC-485s device  
c a n be wir ed to the lines of RS-485 or RS-422 devices  
to monitor the line signals. In this configuration the  
IC-485S will change the function of T+ and T- to  
1.1 Point-to-Paint/4-Wire Full Duplex( Fig. 3-  
1
)
P‘  
r
espectively  
1.2 Point-to-Pointi2-Wire Half Duplex( Fig. 3-2  
)
Before operating, user must complete the instal-  
lation according to the procedure mentioned in Sec-  
2. Multidrop  
tion 2-  
1
Multidrop configuration means that more than  
two devices can be linked all together to communi-  
cate one another through many IC-485 devices. In  
this configuration, one of the IC-485 devices will be  
connected to a master device and the rest of IC-485  
devices will be connected to many other slaver de-  
vices.  
Once the installation had been done, the device  
should operate as the setting function.  
2.1 Multidrop/4-Wire Full Duplex( Fig. 3-3  
2.2 Multidrop/2-Wire Half Duplex( Fig. 3-4  
)
)
3. Simplex/Transmit, Receive Only( Fig. 3-5 )  
User’s Manual  
 
6
IC-485S/IC-485SI  
IC-485S/IC-485SI  
OPERATION  
OPERATION  
3-2 POINT-TO-POINT/2-WIRE HALF DU-  
3 -1 POINT-TO-POINT/~-WIRE FULL DU-  
PLEX  
A
B
Configuration:  
Configuration:  
A
B
TxON,RxON  
TxON,RxON  
DCE/DTE  
Figure 3-2 POINT-TO-POINT/2-WIRE H-  
ALF DUPLEX  
Figure 3-  
1
POINT-TO-POINT/4-WIRE FULL  
DUPLEX  
In above Figure if the PC 1 is a DTE device, then  
the Device A should set the SW1 to DCE. If the PC1  
is a DCE device, then the Device A should set the  
SW1 to DTE. The switch setting method for the  
Device B is identical to Device A’s.  
Note: All the SW1 setting in this Chapter are follow-  
ing the setting rule indicated in this Section.  
9
User’s Manual  
 
User’s Manual  
8
IC-485S/IC-485SI  
OPERATION  
IC-485S/IC-485SI  
OPERATION  
__  
3-3 MULTIDROP/4-WIRE FULL DUPLEX  
3-4 MULTIDROP/2-WIRE HALF DUPLEX  
Bl  
B1  
A
PC1 =>  
=>PC2  
PC1  
COM1/  
COM2  
COM1/  
COM2  
COM1/  
COM2  
COM1/  
COM2  
Ii-485  
b2  
=>PC3  
COM1/  
COM2  
=>PC4  
COM1/  
COM2  
Configuration:  
Configuration:  
Bn  
DCE/DTE  
TxRTS, RxON  
B
TxRTS,  
Note: Bn means any one of the B 1, B2, B3 and SO on.  
Note: Bn means any one of the B 1, B2, B3 and so on.  
Figure 3-3 MULTIDROP/4-WIRE FULL DUPLEX  
Figure 3-4 MULTIDROP/2-WIRE HALF DU-  
PLEX  
10  
11  
User’s Manual  
User’s Manual  
 
IC-485S/IC-485SI  
IC-485S/ IC-485SI  
OPERATION  
OPERATION  
3-5 SIMPLEX/ TRANSMIT, RECEIVE ONLY  
(for IC-485S only)  
3-6 MONITORING  
Device 2  
B1  
Device 1  
=>  
=>PC2  
PC1  
COM1/  
COM2  
COM1/  
COM2  
=>PC3  
COM1/  
COM2  
COM2  
Note: R+ and R- signals are converted and linked to  
the RS-232 port, DB-25 pm 3. R’ + and R’  
(T+ and T-) signals are converted and linked  
to the RS-232 port, DB-25 pm 2.  
=>PC4  
COM1/  
COM2  
Configuration:  
Configuration:  
DCE/ DTE  
DCE/ DTE  
TxON, RxON  
A
TxON, RxON  
Bn  
M O N I  
TxRTS, RxON  
A
Note: Bn means any one of the B 1, B2, B3 and so on.  
Note: The RTS must be at the low level in monitoring  
mode.  
Figure 3-5 SIMPLEX/TRANSMIT, REC-EIVE  
ONLY  
Figure 3-6 MONITORING  
13  
12  
User’s Manual  
User’s Manual  
 
IC-485S/IC-485SI  
OTHERS  
IC-485S/IC-485SI  
OTHERS  
4 OTHERS  
4-2 SELF TEST  
4 -1 TERMINAL BLOCK DEFINITION  
To test the internal circuit of the interface con-  
verter, connect a dumb terminal to the unit and proc-  
ess as follows:  
The four screw terminal block has different defi-  
nition in different operation modes.  
In the DCE/DTE mode, the terminal #l (+V) and  
#2(-V) are configured to transmit data, the transmit-  
ter; the terminals #3(-V) and #4(+V) are configured  
to receive data, the receiver.  
1. Set SW1 to DCE (if the dumb terminal is a DTE  
configuration).  
2. Set SW2 to TxON, RxON.  
3. Connect one wire from Tx+(#l) to Rx+(#4),  
and connect another wire from TX-(#2) to Rx-  
In the MONITOR mode (for IC-485S only), the  
terminals #l and #2 are respectively the positive and  
negative of receiver #I; the terminal #3 and ##4 are  
the positive and negative of receiver #2.  
(#3X  
4. Set the terminal to full duplex and enter data,  
then the data should be displayed on the screen.  
5. If this occurs the internal circuit is opera-  
tional.  
Figure 4-l Terminal Block  
14  
User’s Manual  
 
15  
User’s Manual  
APPENDIX A  
RS-232 DCE/DTE DESCRIPTION  
TROUBLE SHOOTING  
at the DC 9V  
Power Adapter is available.  
Check that the IC-485 is  
plugged securely in PC.  
Device’s Connector Pin #  
Cables  
IC-485  
transmission  
.
.
Check that the 4-wire cable  
is connected properly at  
Note: The DTE mode device must be connected to  
a DCE mode device because the polarity of the  
communication signals are different. The  
shadow area is a connection example for a  
DTE device to a DCE device.  
If failure of printing is still exists upon aforesaid  
solutions, please contact your dealer for help.  
17  
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16  
User’s Manual  
3. Move the computer away from the receiver.  
PREVENTING RADIO  
ENCE  
&
TV INTERFER-  
4. Plug the computer into a different outlet so that  
computer and receiver and on different branch  
circuits.  
Warning this equipment generates, uses and radi-  
ates radio frequency energy and if not installed and  
used in accordance with the instruction manual may  
cause interference to radio and television reception.  
It has been tested and found to comply with the limits  
for a Class A computing device in accordance with  
the specifications in Subpart J of Part 15 of FCC  
Rules, which are designed to provide reasonable  
protection against such interference when operated in  
a commerical environment. Operation of this equip-  
ment in a residential area is likely to cause interfer-  
ence, in which case the user at his own expense will  
be required to take whatever measures may be re-  
quired to correct the interference.  
5. Ensure that the mounting screws, attachment  
connector screws and ground wires are tightly  
secured.  
6. Ensure that good quality, shielded and  
grounded cables are used for data communica-  
tions.  
If necessary, the user should consult the dealer or  
an experienced radio/television technician for addi-  
tional suggestions.  
If this equipment does cause interference to radio  
or television reception, which can be determined by  
turning the equipment off and on, the user is encour-  
aged to try to correct the interference by one or more  
of the following measures:  
1. Reorient the receiving antenna.  
2. Relocate the computer with respect to the re-  
ceiver.  
18  
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19  
User’s Manual  

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