Black Box IC175C, RS-485, IC113C User Manual

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 Web site: www.blackbox.com • E-mail: info@blackbox.com
MARCH 2000
Dual Port RS-232/422/485 Serial Interface
FCC AND IC STATEMENTS, TRADEMARKS
FEDERAL COMMUNICATIONS COMMISSION
AND
INDUSTRY CANADA
RADIO FREQUENCY INTERFERENCE STATEMENTS
This equipment generates, uses, and can radiate radio frequency energy and if not installed and used properly, that is, in strict accordance with the manufacturer’s instructions, may cause interference to radio communication. 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 the equipment is operated in a commercial environment. Operation of this equipment in a residential area is likely to cause interference, in which case the user at his own expense will be required to take whatever measures may be necessary to correct the interference.
Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.
This digital apparatus does not exceed the Class A limits for radio noise emission from digital apparatus set out in the Radio Interference Regulation of Industry Canada.
Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites applicables aux appareils numériques de la classe A prescrites dans le Règlement sur le brouillage radioélectrique publié par Industrie Canada.
TRADEMARKS USED IN THIS MANUAL
AT and IBM are registered trademarks, and XT is a trademark of International Business Machines Corporation.
Any other trademarks mentioned in this manual are acknowledged to be the property of the trademark owners.
DUAL PORT RS-232↔422/485 SERIAL INTERFACE
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 parato 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.
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.
NOM STATEMENT
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 equio 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.
DUAL PORT RS-232↔422/485 SERIAL INTERFACE
Contents
Chapter Page
1. Specifications...................................................................................................1
2. Introduction ....................................................................................................2
2.1 Overview..................................................................................................2
2.2 What’s Included......................................................................................2
2.3 Features ...................................................................................................3
2.4 Technical Description ............................................................................4
3. Address Selection............................................................................................6
4. Option Selection .............................................................................................7
4.1 Port Enable/Disable...............................................................................7
4.2 RS-232 Interface Options .......................................................................9
4.3 RS-422/485 Interface Options.............................................................10
4.4 Line Termination .................................................................................11
5. Installation.....................................................................................................12
Appendix: Circuit-Board Design.......................................................................14
1
CHAPTER 1: Specifications
Protocol — Asynchronous
Speed — IC113C: Up to 115.2 Kbps; IC175C: 460.8 kbps and higher
Operation — RS-232 or RS-485/422, 2- or 4-wire (individually selectable
on each port)
Connectors — (2) DB9M
Communications Chip — IC113C: 16550 UART; IC175C: 16950 UART
MTBF — >150,000 hours
MTTR — <0.25 hours
Materials — Boards are solder mask over bare copper or tin nickel
Operating Temperature — 32° to 122°F (0° to 50°C)
Storage Temperature — -4° to 158°F (-20° to 70°C)
Humidity — 0 to 90% relative humidity, noncondensing
Power — +5 VDC @ 195 mA ±12 V @ 25 mA (derived from PC bus)
Size — 5"W x 7.5 "D (12.7 x 19 cm)
Weight — 0.2 lb. (0.1 kg)
1. Specifications
2
DUAL PORT RS-232↔422/485 SERIAL INTERFACE
2.1 Overview
If you need to operate RS-232, RS-422, or RS-485 devices from your PC, use the Dual Port RS-232/422/485 Serial Interface. Connect to any device that uses the RS-232 interface, such as modems, data-entry terminals, and plotters.
This card allows you to configure two RS-232 ports, two RS-422/485 ports, or one of each. The Dual Port RS-232/422/485 also features greater maximum distance and allows multi-drop communications.
The card also includes a serial utility disk with Seacom, a DOS interrupt and driver package. Seacom allows data to be buffered, eliminating data loss in high-speed data transfers. It also allows more than 4 ports (256 max.) to be configured and utilized under DOS.
The README file on the serial utility disk contains information about the latest changes and revisions. To view this file, insert the diskette into drive A or B and type A:TYPE READ.ME|MORE [ENTER] or B:TYPE READ.ME|MORE [ENTER].
2.2 What’s Included
Your Serial Interface should come with the following items. If any of these items are missing or damaged, contact Black Box at 724-746-5500.
(1) Dual Port RS-232/422/485 Serial Interface card,
(2) serial utility software diskettes: (1) for 32-bit Windows®, (1) for DOS and Windows®3.1x,
This manual
2. Introduction
3
CHAPTER 2: Introduction
2.3 Features
Listed below are the special features your Serial Interface offers.
• Each port is independently addressable.
• Eleven interrupt options, including AT interrupts, for simple integration into existing systems.
• IRQs (2 [9], 3, 4, 5, 6, 7, 10, 11, 12, and 15) supported.
• IRQs can be shared or individually set for each port.
• Supports Interrupt Sharing—only one interrupt line required for
multiple ports.
• Supports any character set defined by binary notation.
• 16550 UARTs on the IC113C help ensure against data loss. This chip features programmable baud rate, data format, interrupt control, and a 16-byte FIFO. The IC175C uses 16950 UARTs, which feature a 128-byte buffer for even better performance.
• Faster baud rates—up to 115.2 Kbps (IC113C) or 460.8 kbps and above (IC175C).
• Addressable as COM1: through COM4: or any other address up to 3FF Hex.
• Support for non-standard baud rates available. These baud rates (such as
31.25K or 76.8K baud) are supported by installing a different oscillator at location Y1. Call Technical Support for more information.
4
DUAL PORT RS-232↔422/485 SERIAL INTERFACE
2.4 Technical Description
The Dual Port RS-232/422/485 Serial Interface utilizes the same 16550 UART chip found in the IBM®asynchronous adapter. This chip features programmable baud rate, data format, and interrupt control. Refer to the IBM Technical Reference for details on programming the chip.
RS-232
The Dual Port RS-232/422/485 Serial Interface meets the RS-232C specifications and provides an asynchronous serial I/O port. This is the standard port configuration found in the IBM AT®computer, including the DB9 style connector.
The table below shows the connector pinouts for ports J1 (port 1) and J2 (port 2) on the Interface while using RS-232.
Pin Number Signal Name Mode
3 Transmit Data (TD) Output RS-232 7 Request To Send (RTS) Output RS-232 4 Data Term Ready (DTR) Output RS-232 5 Ground (GND) –––––––––––– 2 Receive Data (RD) Input RS-232 1 Data Carrier Detect (DCD) Input RS-232 6 Data Set Ready (DSR) Input RS-232 8 Clear To Send (CTS) Input RS-232 9 Ring Indicator (RI) Input RS-232
RS-422
RS-422 allows very long distance communications—4000 feet (about 1219 meters) at 9600 baud—based on use of Category 3, UTP, or better, with virtually error-free differential drive characteristics. RS-422 signal levels are the standard electrical specification used in RS-449 and EIA-530. This allows interfacing with equipment that meets these specifications.
5
CHAPTER 2: Introduction
RS-485
RS-485 is backward-compatible with RS-422; however, it is optimized for multidrop applications. The output of the RS-422/485 driver is capable of being active (enabled) or tri-state (disabled). This capability allows multiple ports to be connected in a multidrop bus and selectively polled. Half-duplex two-wire communications are possible by connecting TX+ to RX+ and TX- to RX- in your cable connector. The enable to the driver is connected to the UART Request To Send (RTS) line for RS-485 communications. This allows the RS-485 driver to be tri-stated (disabled) when inactive on a multidrop polled network. The software that you are using must “know how” to enable the driver when it is answering a poll. Failure to set this jumper correctly can
cause transmitter contention problems, preventing operation by any nodes on the network.
The table below shows the connector pinouts for ports J1 (port 1) and J2 (port 2) on the Interface while using RS-422/485.
Pin Number Signal Name Mode
4 Transmit Data Pos. (TX+) Output RS-422 3 Transmit Data Neg. (TX-) Output RS-422 6 Req. To Send Pos. (RTS+) Output RS-422 7 Req. To Send Neg. (RTS-) Output RS-422 5 Ground (GND) -------------------­1 Receive Data Pos. (RX+) Input RS-422 2 Receive Data Neg. (RX-) Input RS-422 9 Clear To Send Pos. (CTS+) Input RS-422 8 Clear To Send Neg. (CTS-) Input RS-422
6
DUAL PORT RS-232↔422/485 SERIAL INTERFACE
NOTE
Be sure to set the address selections and jumper options before installation.
Each serial port on the Dual Port RS-232/422/485 Serial Interface occupies 8 consecutive I/O locations. DIP switch SW1 sets the base address for Port 1, and DIP switch SW2 sets the address for Port 2. Be careful when selecting the base address, since some selections conflict with existing PC ports. The following table shows several examples that usually do not cause a conflict.
Address Binary Switch Position Setting
Hex A9 A0 1 2 3 4 5 6 7
280-287 1010000XXX OFF ON OFF ON ON ON ON 2A0-2A7 1010100XXX OFF ON OFF ON OFF ON ON 2E8-2EF 1011101XXX OFF ON OFF OFF OFF ON OFF 2F8-2FF 1011111XXX OFF ON OFF OFF OFF OFF OFF 3E8-3EF 1111101XXX OFF OFF OFF OFF OFF ON OFF 300-307 1100000XXX OFF OFF ON ON ON ON ON 328-32F 1100101XXX OFF OFF ON ON OFF ON OFF 3F8-3FF 1111111XXX OFF OFF OFF OFF OFF OFF OFF
Typically COM1:=3F8h; COM2:=2F8h; COM3:=3E8h; COM4:=2E8h
The following illustration shows the correlation between the DIP switch setting and the address bits used to determine the base address. In the figure below, the address 300 hex through 307 hex is selected (300 hex =11 0000 0XXX in binary representation). Note that setting the switch ON (or closed) corresponds to a “0” in the address, while leaving it OFF (or open) corresponds to a “1.”
3. Address Selection
A9 A3
0
1
1 2 3 4 5 6 7 8
EN
ON
OFF
7
CHAPTER 4: Option Selection
NOTE
Be sure to set the address selections and jumper options before installation.
The board contains several jumper straps for each port which must be set for proper operation.
4.1 Port Enable/Disable
Each port on the Dual Port RS-232/422/485 can be enabled or disabled with switch position 8 on the DIP switch. The port is enabled with the switch ON (or closed) and disabled when OFF (or open). If any port is disabled, be sure to also disable the interrupt request for that port by removing the IRQ jumper (see Figure 4-1).
I
NTERFACESELECTION
RS-422/485
To select the RS-422/485 mode of operation, install DIP shunts in sockets found at E6 and E7. E6 sets Port 1 and E7 sets Port 2.
RS-232
To select the RS-232 mode of operation, install DIP shunts in sockets found at E5 and E8. E5 sets Port 1 and E8 sets Port 2.
IRQ Selection
Headers E1 and E2 select the interrupt request for each serial port (E1–Port 2, E2–Port 1). If COM1: is selected, this jumper must be on the IRQ4 setting. If COM2: is selected, this jumper must be on IRQ3.
NOTE
Most communications software applications default COM3: to IRQ4 and COM4: to IRQ3. This requires the sharing of interrupts between COM1: and COM3:, and between COM2: and COM4:. While this is the default, it is not always the best setting. Check your software configuration instructions to determine the most appropriate IRQ setting.
4. Option Selection
8
DUAL PORT RS-232↔422/485 SERIAL INTERFACE
Figure 4-1. Header E1 and E2 (IRQ selection).
Any two or more ports can share a common IRQ by placing the jumpers on the same IRQ setting, and setting the appropriate selections at E9 and E10. Consult your particular software for IRQ selection. If no interrupt is desired, remove the jumper.
NOTE
IRQ 2 on AT class machines is not available. IRQ 9 is substituted in place of IRQ 2. To select IRQ 9, place jumper in the IRQ 2 position.
Figure 4-2 shows Headers E9 and E10. “N” indicates the normal, single interrupt per port mode. The “S” indicates the shared interrupt mode, which allows more than one port to access a single IRQ. The “M” indicates that the inclusion of a 1K-ohm pull-down resistor is required on one port when sharing interrupts. E10 sets Port 1 and E9 sets Port 2.
E1
2/9 3 4 5 7 10 11 12 15
E2
2/9 3 4 5 7 10 11 12 15
9
CHAPTER 4: Option Selection
Figure 4-2. Headers E9 and E10 in Normal Mode.
Set jumpers to “N” for single interrupt mode. This setting is the normal setting for most applications.
Set jumpers to “S” for shared interrupt mode for all ports sharing an IRQ except one. Set that port block for “M.” This provides the pull-down resistor circuit that makes sharing of IRQ’s possible. If you are using more than one Dual
Port RS-232/422/485 Serial Interface or a compatible card in a bus, you should only have one port set to “M.”
Set jumpers to “S” if you are using more than one Dual Port RS-232/422/485 in a bus or if you wish to completely remove the pull-down resistor for hardware compatibility. Setting the board in this configuration when it is not accompanied by a pull-down resistor will prevent the ports from triggering an interrupt.
4.2 RS-232 Interface Options
To select the RS-232 mode of operation, install DIP shunts in the sockets found at E5 and E8. E5 sets Port 1 and E8 sets Port 2. These DIP shunts are completely independent of each other, allowing the user to select a single­port RS-232 or a single-port RS-422.
There are no modem control options for the RS-232 interface: all control signals are implemented. If your software requires certain handshaking signals to be active, then you must connect them either to the device with which you are communicating or you can satisfy the handshake signal requirements by connecting pins 7 to 8 (RTS to CTS) and pins 4 to 6 to 1 (DTR to DSR & DCD). Make these connections on the DB9 connector that connects to each port. Refer to Figure 4-3 when making these connections. (The table on page 4 lists the RS-232 pinout descriptions.)
N
S
M
10
DUAL PORT RS-232↔422/485 SERIAL INTERFACE
Figure 4-3. DB9 Handshake Loopback connections for RS-232
(shown from rear or cable side of connector).
4.3 RS-422/485 Interface Options
To select the RS-422/485 mode of operation, install DIP shunts in the sockets found at E6 and E7. E6 sets Port 1 and E7 sets Port 2.
Figure 4-4 shows Headers E3 and E4. Position “A” determines whether the RS-485 driver is enabled by the UART signal Request To Send (RTS) or always enabled. With the jumper installed in position “A,” RTS enables the driver. Removing the jumper enables the driver, regardless of RTS. E4 sets Port 1 and E3 sets Port 2. This jumper should be set to “A” only if you are running the board in a multidrop polled environment such as RS-485, and you have software that “knows how to talk” on the RS-485 bus. For normal point-to­point RS-422 (such as terminal emulation), make sure that a jumper at position “A” is not in place.
Positions “B” and “C” determine whether the board provides a direct ground connection (as in RS-232 and most RS-422), or a 100-ohm high-impedance ground. The high-impedance ground is normally used by RS-485 (and some RS-422) to avoid ground-loop currents with long cables. Position “B” selects the direct ground, and position “C” selects the 100-ohm high-impedance ground. “C” should be selected when RS-422/485 operation is selected.
5 4 3 2 1
9 8 7 6
11
CHAPTER 4: Option Selection
Figure 4-4. Headers E3 and E4, RS-485 Enable/Ground Selection.
4.4 Line Termination
Typically each end of the RS-422/485 bus must have line-terminating resistors. A 100-ohm resistor is across each RS-422/485 input, and a 1K-ohm pull-up/pull-down combination biases the receiver inputs. If more than two RS-485 nodes are configured in a multidrop network, only the nodes at each end of the bus should have the 100-ohm resistors installed.
A
B
C
12
DUAL PORT RS-232↔422/485 SERIAL INTERFACE
The Dual Port RS-232/422/485 can be installed in any of the PC expansion slots, except J8 on the original IBM XT®and Portable.
IMPORTANT
You MUST set up the operating system BEFORE you physically install the Card.
5.1 Software Installation
If you are installing an ISA adapter in DOS, OS/2®, or QNX, please refer to the appropriate directory on one of the Serial Utilities Disks for instructions.
5.1.1 W
INDOWS
3.1
X
Please refer to the /WINDOWS sub-directory on the Serial Utilities Diskette for help files and current information on the installation of the Card in this operating environment.
5.1.2
W
INDOWS
95/98 U
SERS
For the ISA card, run setup on disk two of the Serial Utilities Diskettes before installing the card. Make note of the resources that Windows assigns the adapter, and set the adapter to match those resources. Power down the computer and install the adapter as described in Section 5.2. If you wish to change any resources assigned to the adapter, refer to the help file installed in the Black Box folder in the Start, Programs menu.
5.1.3 W
INDOWS
NT
For the ISA card, run setup on disk two of the Serial Utilities Diskettes before installing the card. After installing the software, refer to the help file that automatically comes up for installation instructions.
5. Installation
13
CHAPTER 5: Installation
5.2 Hardware Installation
The ISA Card can be installed in any of the PC expansion slots. The Card contains several jumper straps for each port that you must set for proper operation.
1. Turn off PC power. Disconnect the power cord.
2. Remove the PC case cover.
3. Locate an available slot and remove the blank metal slot cover.
4. Gently insert the Card into the slot. Make sure that the Card is seated properly.
5. Replace the screw.
6. Replace the cover.
7. Connect the power cord.
Installation is complete.
Self-Test
To perform a self-test on the card, connect the transmit and receive data pins together. If running 422/485, make sure the plus leads are not connected to the minus leads. Execute the SLT program provided on the supplied utility diskette.
14
DUAL PORT RS-232↔422/485 SERIAL INTERFACE
Appendix: Circuit-Board Design
E6
R6
RS-232 PORT 1
U8
PORT1
E4
C B A
C B A
PORT2
E3
422/485 PORT 1
R7
9 5
E5
R9
U18
RP1
6 1
J1 PORT 1J1 PORT 2
422/485 PORT 2
U13
R8
RP4
U6 U7
R5R4R4
C6
9 5
RS-232 PORT 2
E7E8
U9
C7
PORT1
PORT2
D2
R3
E10E9
U3
PORT2
6 1
C10
U12
C9
P3
P1
15 12 11 10 6 5 4 3 2
PORT1
E1
U11
C8
PORT2
P2
P6
RP2 RP3
15 12 11 10 6 5 4 3
D1
2
E2
R2
PORT2
SW2
C3
PORT1
PORT1
U4 U5
C5
C1
V1
SW1
U2
C2
U1
R1
C1
15
+12V
APPENDIX: Circuit-Board Design
+5V
+12V
B9
P1P1P1
C3
2
3
1
GND
C2
2
3
1
C5
2
3
1
C4
1
C1
1
C8
1
1
C10
+5V
+5V
B3
B29
C6
+5V
2
3
2
3
2
3
2
GND
GND
B1
B31
P1
P1
2
3
GND
1
C7
2
3
1
C9
2
3
-12V
1
-12V
B7
P1
12
+5V
12
+5V
U2
P0P1P2P3P4P5P6
246
A8A6A4
U1
P0P1P2P3P4P5P6
246
A8A6A4
AEN
A11
P1
R2
+5V
20
VDO
R1
+5V
20
VDO
98SW2
19
P=Q
Q0Q1Q2Q3Q4Q5Q6
P7
357
8
11
131517
A3A5A7
A9
AEN
2467531
SW2
SW2
15
1311101214
98SW1
19
P=Q
P7
Q0Q1Q2Q3Q4Q5Q6
8
357
11
131517
A3A5A7
A9
AEN
2467531
SW1
SW1
15
1311101214
A9A8A7A6A5A4A3
A22
A23
A24
A25
A26
P1P1P1P1P1P1P1
BRD/
BWR/
CS1
CS2
DISTR
DISTR
DOSTR
BD1
BD2
BD3
BD4
BD5
BD6
D1
12
R3
13579
E1
246
IRQ2
IRQ3
B4
GND
ADS
RCLK
DOSTR
8
33323431242315
DTR1
BD7
1
2
GND
8
1012141618
IRQ4
B25
RD1
CTS1
SIN
CTS
RTS
OUT1
RTS1
SHEET 2
1 2 3 4
11
131517
IRQ5
B24
SHEET 2
RI1
DSR1
DCD1
BA0
RI
A0A1A2
DSR
DCD
OUT2
CSOUT
DDIS
BAUDOUT 30
10
U6
D2
E9
12
E2
IRQ10
D3
B23
BA1
98
IRQ12
BA2
26
INTRPT
SOUT
11
TD1
SHEET 2
13579
246
D5
8250A
74LS125A
R4
1
2
GND
8
1012141618
IRQ7
1 2 3 4
11
131517
IRQ11
B21D4D6
E10
IRQ15
SHEET 2
RI2
RD2
CTS2
DSR2
DCD2
BA0
BA1
BWR/
DOSTR
BD6
HC244
A30
GND
ADS
DOSTR
8
33323431242315
DTR2
BD7
RP1
RP1
RP1
U3
A29
P1
BA2
26
RI
A0A1A2
SIN
CTS
DSR
DCD
RCLK
8250A
RTS
OUT1
OUT2
CSOUT
DDIS
BAUDOUT
INTRPT
SOUT
11
30
TD2
RTS2
SHEET 2
SHEET 2
4
2
6
13
1211
U6
74LS125A
BWR/
BRD/
GND
10
VDO/VSS
19
+5V
20
975
3
Y1Y2Y3
Y4
VDO
U12
HC244
A1A2A3
A4
G
DIR
G
1
11
131517
19
GND
BRD
SHEET 1
D0D1D2D3D4D5D6
RD/
WR/
A9A8A7A6A5A4A3
B13
B14
P1
P1
P1P1P1P1P1P1P1P1P1P1P1P1P2P2P1P2P2
+5V
1617351213142221191825910363738392827
XTAL1
OUT
VDO
U4
Y1
TXCO
VDO
NC
VSS
20
40
114
78
+5V
GND
BD1
BD2
BD3
BD4
BD5
BD6
BD7
GND
11
1716151413
12
18 BD0
10
B2B3B4B5B6B7B8
B1
VSS
A2A3A4A5A6A7A8
A1
3456789
2
D7
BRESET
+5V
MR
CS0
XTAL2
VSS
D0D1D2D3D4D5D6D7DTR
1234567
GND
BD0
74LS245
A2
BRD/
BRESET
+5V
1617351213142221191825910363738392827
MR
CS0
CS1
CS2
XTAL1
XTAL2
DISTR
DISTR
U5
VSS
D0D1D2D3D4D5D6D7DTR
VDO
1234567
20
GND
1
10
VSS
P>Q
74LS682
Q7
9
121416
18
GND
SW2
SW2
SW2
SW2
GND
1
10
VSS
P>Q
74LS682
Q7
9
121416
18
GND
SW1
SW1
SW1
SW1
A27
A28
40
+5V
GND
BD0
BD1
BD2
BD3
BD4
BD5
1
1
GND
74LS125A
1
23
+5V
74LS125A
BA0
BA1
BA2
BRESET
+5V
181614
12
20
Y1Y2Y3
Y4
U3
VDO/VSS
A1A2A3
A4
G
246
8
1
A0A1A2
RESET
B2
A31
1
U6
SW2
16
GND
GND
56
4
U6
2
SW1
R5
1
16
+5V
GND
P1P1P1
16
DUAL PORT RS-232↔422/485 SERIAL INTERFACE
2
4
10
12
74LS04
74LS04
U7
U7
11
13
GND
GND
21
R6
C
GND2/
J2 5
U9-3
+5V
3
16
1Y2Y3Y
VDO
U9
1A1B2A2B3A3B4A
216
7
8
3
4
7
7
5
RP2
RP2
8
6
7
5
4
2
U8-15
+5V
1514131211
U8
VEE+ VDO
23456
1
+12V
74LS04
74LS04
U7
SPARE GATES
+5V
1
RP4
6
GND
246
E4
135 A
B
8
U7
74LS04
9
SHEET 1
SHEET 1
RI1
RI2
SHEET 2
SHEET 2
SHEET 1
SHEET 2
SHEET 1
SHEET 2
SHEET 1
TD1
RTS1
DTR1
U8-11
U8-13
10169
MC145406
VEE- VSS
8
7
-12V GND
SHEET 2
U10-3
U10-11
368
11
OUTA
OUTB
OUTC
OUTD
U10
V+
21549
14
+5V
MC1489
ENA
INA
ENB
INB
ENC
INC
END
IND
GND
7
101213
GND
+5V
16
VDO
U13
1Y1Z2Y2Z3Y3Z4Y
236
1107
1A2A3A
5
9158
11
SHEET 1
TD2
RTS2
4A
4Z
EN1
14
13412
U7
1
3
GND
21
C
GND1/
J1 5
GND
VSS
EN2
+5V
1
R7
RP4
8
GND
246
E3
135 A
B
6
U7
74LS04
5
RP3
1
RP3
1
RP3
1
RP3
1
75174
+5V GND
RP4
1
RP4
1
RP4
1
RP4
1
U9-5
10 5914
+5V
1
SHEET 2
DTR2
314
SHEET 1
U11-13
413
RP1
5
SHEET 2
512
1
RP1
3
SHEET 2
U11-11
MC145406
VEE- VSS
611
710
89
-12V GND
SHEET 2
U9-11
U9-13
8
11
13
4Y
VSS GND
75173
4B
EN
EN
15412
U11-15
+5V
3
2
16
RP2
4
15
RP2
U11
1
VEE+ VDO
2
1
+12V
R9
12
-12V
2423222120191817161514
E5
RS-232
123456789
RD1/
DSR1/
269
J1J1J1
R8
SHEET 2
U8-11
U8-15
U8-13
U10-11
13
E6
101112
RI1/
RTS1/
7
J1
U9-5
2423222120191817161514
123456789
RD1
TD1/
CTS1/
DTR1/
DCD1/
813
4
J1J1J1
J1
SHEET 2
U9-3
101112
CTS1
GND
13
E7
RS-422
DSR1
DCD1
SHEET 1
U9-11
2423222120191817161514
123456789
RD2
RI2/
RD2/
RTS2/
DSR2/
269
7
J2J2J2
J2
SHEET 2
U9-13
101112
CTS2
GND
13
RS-422
DSR2
DCD2
SHEET 1
2423222120191817161514
E8
123456789
CTS2/
DCD2/
813
J2J2J2
SHEET 2
U10-3
U11-11
U11-15
U11-13
13
RS-232
101112
TD2/
DTR2/
4
J2
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