Black Box Network Hardware DB9F RJ 11 IC623A F User Manual

MARCH 1998  
IC623A-M  
IC624A-F  
IC620A-F  
IC620A-M  
IC623A-F  
IC624A-M  
RS-232/485 Converter  
1 0 / 1 0 0  
S u p e r S w i t c h 8  
C o d e : I C 6 2 0 A  
CUSTOMER SUPPORT INFORMATION  
Order toll-free in the U.S. 24 hours, 7 A.M. Monday to midnight Friday: 877-877-BBOX  
FREE technical support, 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746  
Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018  
 
RS-232/485 CONVERTER  
NORMAS OFICIALES MEXICANAS (NOM)  
ELECTRICAL SAFETY STATEMENT  
INSTRUCCIONES DE SEGURIDAD  
1. Todas las instrucciones de seguridad y operación deberán ser leídas  
antes de que el aparato eléctrico sea operado.  
2. Las instrucciones de seguridad y operación deberán ser guardadas  
para referencia futura.  
3. Todas las advertencias en el aparato eléctrico y en sus instrucciones  
de operación deben ser respetadas.  
4. Todas las instrucciones de operación y uso deben ser seguidas.  
5. El aparato eléctrico no deberá ser usado cerca del agua—por  
ejemplo, cerca de la tina de baño, lavabo, sótano mojado o cerca  
de una alberca, etc..  
6. El aparato eléctrico debe ser usado únicamente con carritos o  
pedestales que sean recomendados por el fabricante.  
7. El aparato eléctrico debe ser montado a la pared o al techo sólo  
como sea recomendado por el fabricante.  
8. Servicio—El usuario no debe intentar dar servicio al equipo eléctrico  
más allá a lo descrito en las instrucciones de operación. Todo otro  
servicio deberá ser referido a personal de servicio calificado.  
9. El aparato eléctrico debe ser situado de tal manera que su posición  
no interfiera su uso. La colocación del aparato eléctrico sobre una  
cama, sofá, alfombra o superficie similar puede bloquea la  
ventilación, no se debe colocar en libreros o gabinetes que impidan  
el flujo de aire por los orificios de ventilación.  
2
 
NOM STATEMENT  
10. El equipo eléctrico deber ser situado fuera del alcance de fuentes  
de calor como radiadores, registros de calor, estufas u otros aparatos  
(incluyendo amplificadores) que producen calor.  
11. El aparato eléctrico deberá ser connectado a una fuente de poder  
sólo del tipo descrito en el instructivo de operación, o como se  
indique en el aparato.  
12. Precaución debe ser tomada de tal manera que la tierra fisica y la  
polarización del equipo no sea eliminada.  
13. Los cables de la fuente de poder deben ser guiados de tal manera  
que no sean pisados ni pellizcados por objetos colocados sobre o  
contra ellos, poniendo particular atención a los contactos y  
receptáculos donde salen del aparato.  
14. El equipo eléctrico debe ser limpiado únicamente de acuerdo a las  
recomendaciones del fabricante.  
15. En caso de existir, una antena externa deberá ser localizada lejos  
de las lineas de energia.  
16. El cable de corriente deberá ser desconectado del cuando el equipo  
no sea usado por un largo periodo de tiempo.  
17. Cuidado debe ser tomado de tal manera que objectos liquidos no  
sean derramados sobre la cubierta u orificios de ventilación.  
18. Servicio por personal calificado deberá ser provisto cuando:  
A: El cable de poder o el contacto ha sido dañado; u  
B: Objectos han caído o líquido ha sido derramado dentro  
del aparato; o  
C: El aparato ha sido expuesto a la lluvia; o  
D: El aparato parece no operar normalmente o muestra  
un cambio en su desempeño; o  
E: El aparato ha sido tirado o su cubierta ha sido dañada.  
3
 
RS-232/485 CONVERTER  
TRADEMARKS  
Product names mentioned in this manual may be  
trademarks or registered trademarks of their respective  
companies and are hereby acknowledged.  
4
 
TABLE OF CONTENTS  
CONTENTS  
1. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . .6  
2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . .8  
2.1 Description . . . . . . . . . . . . . . . . . . . . . . .8  
2.2 Features . . . . . . . . . . . . . . . . . . . . . . . . .9  
3. Configuration . . . . . . . . . . . . . . . . . . . . . . . .11  
3.1 Accessing the DIP Switches . . . . . . . . .11  
3.1.1 DIP Switch S1 Settings . . . . . . . .16  
3.1.2 DIP Switch S2 Settings . . . . . . . .18  
3.2 Typical Applications . . . . . . . . . . . . . .20  
4. Installation 24  
4.1 Twisted-Pair Connection . . . . . . . . . . .22  
4.1.1 Twisted-Pair Connections  
Using Terminal Blocks . . . . . . .23  
4.1.2 Twisted-Pair Connection  
Using RJ-11 or RJ-45 . . . . . . . . .29  
4.2 Wiring for Multipoint Circuits . . . . . .31  
4.3 Connection to the EIA/TIA-574  
Interface . . . . . . . . . . . . . . . . . . . . . . . .33  
4.4 Operating the Converter . . . . . . . . . . .34  
Appendix: EIA/TIA-574 Interface . . . . . . . . .35  
5
 
RS-232/485 CONVERTER  
1. Specifications  
Transmission Format — Asynchronous  
Data Rate — Up to 115,200 bps  
Range — Up to 9 miles (14.4 km)  
Serial Interface — EIA/TIA-574 standard RS-232 DCE  
Connectors IC620A-F: (1) DB9 female,  
(1) 5-position terminal block,  
IC620A-M: (1) DB9 male, (1) 5-position terminal block;  
IC623A-F: (1) DB9 female, (1) RJ-11 female,  
IC623A-M: (1) DB9 male, (1) RJ-11 female;  
IC624A-F: (1) DB9 female, (1) RJ-45 female,  
IC624A-M: (1) DB9 male, (1) RJ-45 female  
Transmit Line — 2-wire or 4-wire unconditioned,  
unshielded, solid core, twisted pair  
Transmit Mode — 4-wire, full- or half-duplex;  
2-wire half-duplex  
Control Signals — DSR turns ON immediately  
after the terminal raises DTR; DCD turns ON  
after recognizing the receive signal from the line;  
6
 
CHAPTER 1: Specifications  
CTS turns ON after the terminal raises RTS  
RTS/CTS Delay — 8 msec or “no delay”  
Carrier — The carrier is switch-selected either  
continuous operation or switched operation,  
controlled by RTS  
Surge Protection — 600 W power dissipation at 1 ms  
Temperature — 32 to 122°F (0 to 50°C)  
Humidity — 5 to 95%, noncondensing  
Maximum Altitude — 10,000 ft. (304.8 m)  
MTBF — 209,384 hours  
Power — Draws operating power from EIA/TIA-574  
data and control signals; no AC power or batteries  
required. If necessary, 6 to 12 VDC can be applied  
to pin 9 of the EIA/TIA-574 interface  
Size — 2.5"H x 1.2"W x 0.75"D (6.4 x 3.1 x 1.9 cm)  
Shipping Weight — 1 lb. (0.5 kg)  
7
 
RS-232/485 CONVERTER  
2. Introduction  
2.1 Description  
The RS-232/485 Converter (IC620A) is an ultra-  
miniature interface converter. Requiring no  
AC power or batteries for operation, the Converter  
supports asynchronous communication up to  
115.2 Kbps over one or two unconditioned  
twisted pairs. Distances up to 15 miles (24 km)  
are attainable at lower data rates (1.2 Kbps,  
19 AWG twisted pair).  
The Converter can handle up to 31 terminal drops  
in a multipoint polling environment. For RS-485  
applications that require hardware handshaking, the  
Converter passes one control signal in each direction  
(see the last bullet point in Section 2.2 for an  
explanation). The Converter may be configured for  
high or low impedance, and the carrier may be set to  
“constantly on” or “controlled by RTS.” The unit can  
operate with or without “echo.” RTS/CTS delay may  
be set for “no delay” or “8 ms delay.”  
There are three options for twisted-pair  
connection: terminal blocks with strain relief, RJ-11,  
or RJ-45. Silicon Avalanche Diodes provide 600 watts  
per wire of protection against harmful data-line  
transient surges.  
8
 
CHAPTER 2: Introduction  
Six models are available:  
• DB9F/Term (IC620A-F)  
• DB9M/Term (IC620A-M)  
• DB9F/RJ-11 (IC623A-F)  
• DB9M/RJ-11 (IC623A-M)  
• DB9F/RJ-45 (IC624A-F)  
• DB9F/RJ-45 (IC624A-M)  
2.2 Features  
Operates asynchronously, point-to-point  
or multipoint, over 2 or 4 wires.  
Up to 31 multipoint device drops in a polling  
environment.  
Data rates up to 115.2 Kbps.  
Passes transmit and receive data, one control  
signal in each direction.  
No AC power or batteries required.  
Variable high/low impedance settings.  
Able to operate with or without “echo.”  
Carrier can be set as “constantly on” or  
“controlled by RTS.”  
9
 
RS-232/485 CONVERTER  
Twisted-pair connection via strain relief,  
RJ-11, or RJ-45.  
Silicon Avalanche Diode surge protection.  
•A Transmitter On signal received at the RS-485  
RCV connection will cause DCD output at the  
RS-232 connector to assert High.  
10  
 
CHAPTER 3: Configuration  
3. Configuration  
The Converter is configured using two internal  
4-position DIP switches. This section shows how to  
access the DIP switches, provides an overview of the  
factory-default settings, and describes all possible  
configuration options. For instructions on how to  
configure the Converter for specific applications,  
see Section 3.2.  
3.1 Accessing the DIP Switches  
The Converter has a main PC board and a daughter-  
board. DIP switch S1 is located on the underside of  
the main PC board (see Figure 3-1). DIP switch S2  
is located on the top of the daughterboard (see  
Figure 3-2).  
11  
 
RS-232/485 CONVERTER  
Switch S1  
Figure 3-1. Underside of the Converter’s main PC board,  
showing the location of DIP switch S1.  
12  
 
CHAPTER 3: Configuration  
Switch S2  
RCV  
XMT  
+
+
-
G
-
Figure 3-2. Top of the Converter’s daughterboard,  
showing the location of DIP switch S2.  
13  
 
RS-232/485 CONVERTER  
To access the Converter’s internal PC boards,  
insert a small flat-blade screwdriver between the  
connector and the lip of the case and twist gently  
as shown in Figure 3-3.  
Figure 3-3. Opening the Converter’s plastic case with a small  
screwdriver.  
14  
 
CHAPTER 3: Configuration  
Both DIP switch S1 and S2 are marked with  
individual switch numbers 1 through 4. Use these  
numbers, and the “ON” designation to orient the  
switch properly (see Figure 3-4). Use a small  
screwdriver or similar instrument to set each  
individual switch.  
ON  
ON  
1
2
3
4
OFF  
Figure 3-4. Close-up of DIP switches S1 and S2,  
showing ON/OFF orientation.  
15  
 
RS-232/485 CONVERTER  
3.1.1 DIP SWITCH S1 SETTINGS  
DIP switch S1 is used to configure receive impedance  
(termination), 2-wire/4-wire operation and “echo”  
enable/disable. Table 3-1 shows the factory-default  
settings for switch S1. Following Table 3-1 is a  
detailed description of each switch.  
Table 3-1. Switch S1 Summary Table (factory defaults in bold)  
Position  
Function  
OFF Position  
ON Position  
S1-1  
S1-2*  
S1-3*  
S1-4  
RCV impedance (termination)  
2-wire/4-wire  
16 K ohms, typ.  
4-wire  
120 ohms  
2-wire  
2-wire/4-wire  
4-wire  
2-wire  
Echo Mode  
Echo OFF  
Echo ON  
*Switches S1-2 and S1-3 should be switched simultaneously.  
16  
 
CHAPTER 3: Configuration  
S1-1: Receive Impedance (Termination)  
The setting for switch S1-1 selects the impedance  
of the input receiver. You may select either a “low”  
impedance of 120 ohms or a “high” impedance of  
16 K ohms. By selecting the proper impedance for  
each drop, you can have up to 50 receivers in one  
application.  
S1-1  
Setting  
On  
Off  
Low (120 ohms)  
High (16 K ohms typical)  
S1-2 and S1-3: 2-wire/4-wire Modes  
Switches S1-2 and S1-3 are set together to determine  
whether the Converter is in 2-wire or 4-wire  
operating mode.  
NOTE  
2-wire mode is half-duplex only.  
S1-2  
S1-3  
Setting  
On  
Off  
On  
Off  
2-wire mode  
4-wire mode  
17  
 
RS-232/485 CONVERTER  
S1-4: Echo Mode  
The setting for switch S1-4 determines whether  
the Converter echoes data back to the transmitting  
device (half-duplex mode only).  
S1-4  
Setting  
On  
Off  
Echo On  
Echo Off  
3.1.2 DIP SWITCH S2 SETTINGS  
DIP switch S2 is used to configure carrier control,  
RTS/CTS delay, and communication protocol. Table  
3-2 shows the factory-default settings for switch S2.  
Following Table 3-2 is a detailed description of each  
individual switch.  
Table 3-2. Switch S2 Summary Table (factory defaults in bold)  
Position  
Function  
OFF Position  
ON Position  
S2-1  
S2-2  
S2-3*  
S2-4*  
Carrier Control  
Constantly ON  
No Delay  
High  
ON Position  
8 msec  
RTS/CTS Delay  
“XMT Off” impedance  
“XMT Off” impedance  
Intermediate  
Intermediate  
High  
*Switches S2-3 and S2-4 should be switched simultaneously.  
18  
 
CHAPTER 3: Configuration  
S2-1: Carrier Control Method  
The setting for S2-1 determines whether the carrier  
is “Constantly On” or “Controlled by RTS.” This  
allows for operation in switched carrier, multipoint,  
and/or hardware handshaking applications.  
S2-1  
Setting  
On  
Off  
Controlled by RTS  
Constantly On  
NOTE  
When in Controlled mode, RTS must go negative to turn  
off the Transmitter and enable the Receiver.  
S2-2: RTS/CTS Delay  
The setting for switch S2-2 determines the amount of  
delay between the time the Converter “sees” RTS and  
when it sends CTS.  
NOTE  
The RTS/CTS Delay setting should be based upon  
transmission timing.  
S2-2  
Setting  
On  
Off  
8 msec  
No delay  
19  
 
RS-232/485 CONVERTER  
S2-3 and S2-4: “Transmit Off” Impedance  
Switches S2-3 and S2-4 are set together to determine  
whether the receiving device “sees” the impedance  
of the Converter’s transmitter as being “high” or  
“intermediate” when the transmitter is turned off.  
The “intermediate” setting is useful in half-duplex  
environments where the receiving device does not  
respond well to the “high” setting.  
S2-3  
S2-4  
Setting  
On  
Off  
On  
Off  
Intermediate impedance  
High impedance  
3.2 Typical Applications  
The Converter is commonly used in five types  
of applications:  
• 4-wire/full-duplex/point-to-point  
• 4-wire/half-duplex/point-to-point  
• 2-wire/half-duplex/point-to-point  
• 4-wire/multipoint  
• 2-wire/multipoint  
20  
 
CHAPTER 3: Configuration  
The switch settings generally needed to  
configure the Converter for these applications  
are shown in Table 3-3.  
NOTE  
Do not change switch settings until you have carefully  
read Section 3.1.  
Table 3-3. Typical Converter Applications  
Switch  
Settings  
Point-to-Point  
Multipoint  
4W  
4W  
4W HDX  
2W  
2W  
S1-1: Rcv impedance  
(Termination)  
ON  
ON  
ON  
Master—ON  
Slaves—OFF  
Last Slave—ON  
S1-2: 2-wire/4-wire  
S1-3: 2-wire/4-wire  
OFF  
OFF  
OFF  
OFF  
ON  
ON  
OFF  
OFF  
ON  
ON  
S1-4: Echo  
OFF  
OFF  
OFF  
ON  
OFF  
ON  
OFF  
OFF  
S2-1: Carrier Control  
Master—OFF ON  
Slaves—ON  
S2-2: RTS/CTS Delay  
ON  
ON  
ON  
OFF  
ON  
S2-3: “Xmt Off” imp.  
S2-4: “Xmt Off” imp.  
OFF  
OFF  
OFF  
OFF  
OFF  
OFF  
OFF  
OFF  
OFF  
OFF  
21  
 
RS-232/485 CONVERTER  
4. Installation  
Once the Converter is properly configured, it is  
ready to connect to your system. This section tells  
you how to properly connect the Converter to the  
twisted-pair and EIA/TIA-574 interfaces, and how  
to operate the Converter.  
4.1 Twisted-Pair Connection  
The Converter supports 2-wire or 4-wire communi-  
cation between two or more EIA/TIA-574 devices at  
data rates up to 115.2 Kbps. There is one essential  
requirement for installing the Converter:  
To function properly, the Converter needs  
one or two twisted pairs of metallic wire. These  
pairs must be unconditioned dry metallic wire,  
between 19 and 26 AWG solid copper core,  
unshielded (the higher-number gauges may  
limit distance). Standard dialup telephone  
circuits that run through signal-equalization  
equipment are not acceptable.  
22  
 
CHAPTER 3: Configuration  
For your convenience, the Converter is available  
with several different twisted-pair interfaces: RJ-11  
jack, RJ-45 jack, and terminal blocks with strain  
relief. The Converter is also available with DB25  
male or female connectors.  
4.1.1 TWISTED-PAIR CONNECTIONS USING TERMINAL  
BLOCKS  
If your application requires you to connect one or  
two pairs of bare wires to the Converter, you will  
need to open the case to access the terminal blocks.  
The following instructions tell you how to open the  
case, connect the bare wires to the terminal blocks,  
and fasten the strain-relief collar in place so the wires  
won’t pull loose.  
1. You should already have the case open for the  
configuration procedure. If not, see Section 3.1.  
2. Strip the outer insulation from the twisted pair(s)  
about one inch from the end.  
Figure 4-1. Stripping the outer insulation.  
23  
 
RS-232/485 CONVERTER  
3. Strip the insulation on each of the twisted- pair  
wires about 1⁄8 inch.  
Figure 4-2. Stripping the insulation on the twisted-pair wires.  
4. In a two-pair circuit, connect one pair of wires to  
XMT+ and XMT- (transmit positive and negative)  
on the terminal block, making careful note of  
which color is positive and which color is negative.  
5. Connect the other pair of wires to RCV+ and RCV-  
(receive positive and negative) on the terminal  
block, again making careful note of which color  
is positive and which color is negative.  
Ultimately, you will want to construct a two-pair  
crossover cable that makes a connection with the  
two Converters as shown in Figure 4-3.  
24  
 
CHAPTER 3: Configuration  
XMT+----------------------------------------RCV+  
XMT- --------------------------------------- RCV-  
G-------------To Shield (Optional)  
RCV+-----------------------------------------XMT+  
RCV - ----------------------------------------XMT-  
G
Figure 4-3. Two-Pair Crossover Cable.  
6. In a single-pair circuit, use only the transmit  
(XMT) pair as shown in Figure 4-4.  
XMT+------------------------------------------XMT+  
XMT - -----------------------------------------XMT-  
Figure 4-4. Transmit Pair.  
NOTE  
If there is a shield around the twisted-pair cable, it may  
be connected to “G” on the terminal block. To avoid  
ground loops, we recommend connecting the shield at  
the computer end only. A ground wire is not necessary  
for proper operation of the Converter.  
7. When you finish connecting the wires to the  
terminal block, the assembly should resemble  
Figure 4-5.  
25  
 
RS-232/485 CONVERTER  
Figure 4-5. Wires connected to the terminal block.  
8. Place the two halves of the strain-relief assembly  
on either side of the telephone wire and press  
together very lightly. Slide the assembly so that  
it is about two inches from the terminal posts  
and press together firmly. If your cable diameter  
is too small or too large for our strain relief, call  
for technical support.  
Figure 4-6. Installing the strain relief assembly.  
26  
 
CHAPTER 3: Configuration  
9. Insert the strain-relief assembly with the wire going  
through it into the slot in the bottom half of the  
modem case and seat it into the recess in the case.  
(If the telephone wire is too thin to be held by  
the strain-relief assembly, you will need to order a  
different-sized strain relief. Call for technical  
support.)  
Figure 4-7. Completing the installation  
of the strain-relief assembly.  
27  
 
RS-232/485 CONVERTER  
10. Bend the top of the case as necessary to place it  
over the strain-relief assembly. Do not snap the  
case together yet.  
Figure 4-8. Closing the case.  
11. Insert one captive screw through a saddle washer  
and then insert the captive screw, with the washer  
on it, through the hole in the DB25 end of the  
case. Snap that side of the case closed. Repeat  
the process for the other side. This completes  
the cable installation.  
28  
 
CHAPTER 3: Configuration  
4.1.2 TWISTED-PAIR CONNECTION USING RJ-11 OR RJ-45  
The RJ-11 and RJ-45 connectors on the Converter’s  
twisted-pair interface are pre-wired for a standard  
telco wiring environment. The signal/pin  
relationships are shown in Figure 4-9.  
RJ-11  
Signal  
RJ-45  
Signal  
1
1--------------GND  
2--------------RCV-  
3--------------XMT+  
4--------------XMT-  
5--------------RCV+  
6--------------GND  
1---------------N/C  
2---------------GND  
3---------------RCV-  
1
4---------------XMT+  
5---------------XMT-  
6---------------RCV+  
7---------------GND  
8---------------N/C  
1
Connection to ground is optional.  
Figure 4-9. Signal/Pin Relationships.  
29  
 
RS-232/485 CONVERTER  
Signal  
Pin#  
Pin#  
Signal  
1
1
GND  
1--------------6 GND  
RCV-  
2--------------4 XMT-  
3--------------5 RCV+  
4--------------2 XMT+  
5--------------3 XMT+  
XMT+  
XMT-  
RCV+  
1
1
GND  
6--------------1 GND  
1
Connection to ground is optional.  
Figure 4-10. RJ-11 Cable (4-wire).  
Signal  
Pin#  
Pin#  
Signal  
1
1
GND  
2--------------7 GND  
RCV-  
3--------------5 XMT-  
4--------------6 RCV+  
5--------------3 RCV-  
6--------------4 XMT+  
XMT+  
XMT-  
RCV+  
1
1
GND  
7--------------2 GND  
Figure 4-11. RJ-45 Cable (4-wire).  
30  
 
CHAPTER 3: Configuration  
Signal  
Pin#  
Pin#  
Signal  
XMT+  
XMT-  
3---------------3XMT+  
4---------------4XMT-  
Figure 4-12. RJ-11 Cable (2-wire).  
Signal  
Pin#  
Pin#  
Signal  
XMT+  
XMT-  
4--------------4 XMT+  
5--------------5 XMT-  
Figure 4-13. RJ-45 Cable (2-wire).  
4.2 Wiring for Multipoint Circuits  
The Converter supports multipoint applications  
using a daisychain topology. This topology requires  
special wiring, as well as specific DIP-switch settings  
for master and slave units. Refer to Table 3-3 for  
multipoint DIP switch settings.  
31  
 
RS-232/485 CONVERTER  
DAISYCHAIN TOPOLOGY  
Using a daisychain topology, you may connect several  
Converters together in a master/slave arrangement.  
Maximum distance between the units will vary based  
upon the number of drops, data rate, wire gauge,  
etc. Call Technical Support for specific distance  
estimates.  
Figure 4-14 shows how to wire the two-pair cables  
properly for a Converter daisychain topology.  
XMT A  
XMT B  
RCV A  
RCV B  
XMT B  
RCV A  
RCV B  
XMT B  
RCV B  
RCV A  
XMT A  
RCV B  
RCV A  
XMT A  
MASTER  
SLAVE 1  
SLAVE 2  
SLAVE 3  
SLAVE N  
XMT A  
XMT A  
XMT B  
XMT B  
RCV B  
RCV A  
Figure 4-14. Daisychain wiring for the Converter host and slaves.  
32  
 
CHAPTER 3: Configuration  
4.3 Connection to the EIA/TIA-574 Interface  
The Converter is designed to plug directly into the  
DB9 serial port of an EIA/TIA-574 DTE device (PC,  
laptop, host). If you must use a cable to connect the  
Converter to the DTE device, make sure that it is a  
straight-through cable of the shortest possible  
length—we recommend 6 ft. (1.8 m) or less.  
The DB9 connector on the Converter is wired  
according to the EIA/TIA-574 Standard, as shown  
in Figure 4-15.  
DB9  
Signal  
1---------------------CD  
2---------------------RD  
3---------------------TD  
4---------------------DTR  
5---------------------SG/FG  
6---------------------DSR  
7---------------------RTS  
8---------------------CTS  
9---------------------(Optional 6-12 VDC)  
Figure 4-15. EIA/TIA-574 Standard.  
NOTE  
The Converter is configured as a DCE, and is therefore  
designed to connect to a DTE. If you need to connect the  
Converter to another DCE device, call technical support  
for details about the proper crossover cable.  
33  
 
RS-232/485 CONVERTER  
4.4 Operating the Converter  
Once the Converter is properly installed, it should  
operate transparently—as if it were a standard cable  
connection. Operating power is derived from the  
RS-232 data and control signals; there is no ON/OFF  
switch. All data signals from the RS-232 and RS-485  
interfaces are passed straight through. One hardware  
flow-control signal is also passed in each direction  
(see the last bullet point in Section 2.2 for an  
explanation).  
34  
 
APPENDIX  
Appendix: EIA/TIA-574 Interface  
DB9  
Signal  
Direction  
1----------------------CD  
2----------------------RD  
3----------------------TD  
4----------------------DTR  
5----------------------SG/FG  
6----------------------DSR  
7----------------------RTS  
8----------------------CTS  
Output  
Output  
Input  
Input  
———  
Output  
Input  
Output  
9----------------------Optional 6-12 VDC  
35  
 
© Copyright 1998. Black Box Corporation. All rights reserved.  
1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax 724-746-0746  
 

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