BLACK BOX ME890AE-R Catx DB9 Line Diver User Manual
- June 6, 2024
- BLACK BOX
Table of Contents
USER MANUAL
ME890AE-R2
CATX DB9 LINE DRIVER
24/7 TECHNICAL SUPPORT AT 1.877.877.2269 OR VISIT BLACKBOX.COM
CHAPTER 1: SPECIFICATIONS
TABLE 1-1. SPECIFICATIONS
| SPECIFICATION | DESCRIPTION |
|---|
Power
Power Supply| Input: 100–240 VAC, 47–63 Hz;
Output: 5 VDC with universal plug kit; PSE approved
Interface
Interface| DB9: EIA RS-232-F, ITU v.28;
RJ-45: RS-485
Flow Control| RTS/CTS
Mechanical
Dimensions| 0.8″H x 1.7″W x 3.2″D (2.1 x 4.3 x 8.1 cm)
Weight| 2.0 lb. (0.9 kg), including local unit, remote unit, and (2) power
supplies
Data Transmission
Data Format| Asynchronous, Full-Duplex
Maximum Distances/Data Rates| 4000 ft. (1250 m) for data rates < or = 100
kbps;
2000 ft. (625 m) for data rates < or = 200 kbps;
1500 ft. (468 m) for data rates < or = 250 kbps
NOTE: The combined RS-232 cable and device load should be < or = 1000 pf and >
or = 3 kohm in order to
operate at 250 kbps
Isolation| 1000 VDC isolation between RS-232 interface and RS-485 interface
Cables and Connectors
Interconnect Cable| Four-pair twisted-pair cable, low-capacitance CAT5 or CAT6
recommended for best performance
Connectors| (1) DB9 female (local),
(1) DB9 male (remote),
(1) RJ-45,
(1) DC power jack
Environmental
Temperature| Operating: 32 to 140° F (0 to 60° C);
Storage: -14 to +158° F (-10 to +70° C)
Humidity (non-condensing)| Operating: 20 to 80%;
Storage: 10 to 90%
CHAPTER 2: OVERVIEW
INTRODUCTION
The CATx DB9 Line Drivers enable you to position your receiving device up to 4000 feet (1250 m) from the sending device. The local unit has a DB9 female connector and is configured as a DCE device. The remote unit has a DB9 male connector and is configured as a DTE device. This allows the local/remote pair to function as a long extension cable between two RS-232 devices. There are no user-configurable settings. The local and remote units are connected with a CAT5 or CAT6 twisted-pair cable. The local and remote units swap the RJ-45 pins so a straight-pinned cable is required. The units are isolated to provide protection from differences in ground potential between the units. The units pass TXD, RXD, RTS, and CTS signals to allow the application to use hardware handshake signals if required. The local unit provides an active high output on DSR and DCD, while the remote unit provides an active high output on DTR.
FEATURES
- Signals include RD, TD, RTS, CTS, GND, plus DTR (or DSR) asserted
- Local and remote units can be up to 4000 feet (1250 m) apart
- No configuration needed
- Fixed DCE local and DTE remote
- Operates point-to-point in full-duplex mode
- Provides 1000-VDC isolation between RS-232 interface and RS-485 interface
- Requires one external power supply (included) at each end
- Operates at 32 to 140° F (0 to 60° C)
- Supports data pair plus one control pair, and asserts one additional control line
- Can provide jumpers to select different control leads
WHAT’S INCLUDED
Your package should include the following items. If anything is missing or damaged, contact Black Box Technical Support at 877-877-2269 or info@blackbox.com
- (1) Local Unit
- (1) Remote Unit
- (2) 5-VDC external power supplies
To download this user manual from the Black Box web site:
- Go to www.blackbox.com
- Enter the part number ME890AE-R2 in the search box.
- Click on the product in the “Product Results” page.
- Click on the “Support” tab on the product page, and select the document you wish to download.
HARDWARE DESCRIPTION
LOCAL UNIT
Figure 2-1 shows the local unit’s left-side panel. Figure 2-2 shows its
right-side panel. Table 2-1 describes the local unit’s components pictured in
Figures 2-1 and 2-2.
FIGURE 2-1. LOCAL UNIT’S LEFT-SIDE PANEL
FIGURE 2-2. LOCAL UNIT’S RIGHT-SIDE PANEL
TABLE 2-1. LOCAL UNIT’S LEFT- AND RIGHT-SIDE COMPONENTS
| NUMBER IN FIGURES 2-1 AND 2-2 | CONNECTION | DESCRIPTION |
|---|---|---|
| 1 | RJ-45 connector | Connects to remote unit via CATx cable |
| 2 | Barrel connector | Connects to power supply |
| 3 | DB9 female connector | Connects to DCE device |
Figure 2-3 shows the remote unit’s left-side panel. Figure 2-4 shows its right-side panel. Table 2-2 describes the remote unit’s components pictured in Figures 2-3 and 2-4.
FIGURE 2-3. REMOTE UNIT’S LEFT-SIDE PANEL
FIGURE 2-4. REMOTE UNIT’S RIGHT-SIDE PANEL
TABLE 2-2. REMOTE UNIT’S LEFT- AND RIGHT-SIDE COMPONENTS
| NUMBER IN FIGURES 2-3 AND 2-4 | CONNECTION | DESCRIPTION |
|---|---|---|
| 1 | RJ-45 connector | Connects to local unit via CATx cable |
| 2 | Barrel connector | Connects to power supply |
| 3 | DB9 male connector | Connects to DTE device |
APPLICATION DIAGRAM
FIGURE 2-5. TYPICAL APPLICATION
CHAPTER 3: INSTALLATION
Before you begin, make sure all equipment is powered off and the CATx DB9 Line Drivers are not powered on.
INSTALLATION STEPS
Step 1: Connect the local (DB9 female) device to a PC or Data Terminal
Equipment (DTE) device.
Step 2: Connect the remote (DB9 male) device to a Data Communication Equipment
(DCE) device.
Step 3: Connect the local and remote units with a straight-through CAT5 or
CAT6 twisted-pair cable.
Step 4: Once all connections are made, use the supplied 5-VDC power supplies
to power up the Line Drivers. Then apply power to your equipment.
DB9 PINOUT
TABLE 3-1. DB9 PINOUT
| DB9 SIGNAL NUMBER | DB9 SIGNAL NAME | LOCAL DCE | REMOTE DTE |
|---|---|---|---|
| 1 | Carrier Detect | Asserted high | No connection |
| 2 | Received Data | Output | Input |
| 3 | Transmitted Data | Input | Output |
| 4 | Data Terminal Ready | No connection | Asserted high |
| 5 | Signal Ground | RS-232 Ground | RS-232 Ground |
| 6 | Data Set Ready | Asserted high | No connection |
| 7 | Request To Send | Input | Output |
| 8 | Clear To Send | Output | Input |
| 9 | Ring Indication | No connection | No connection |
NOTES:
DCE = Data Carrier Equipment (can connect to a PC)
DTE = Data Terminal Equipment (configured the same as a PC)
TABLE 3-2. RJ-45 PINOUT
| RJ-45 PIN NUMBER | RJ-45 SIGNAL NAME | LOCAL | REMOTE |
|---|---|---|---|
| 1 | Pair 3+ | TXD+ (output) | TXD+ (input) |
| 2 | Pair 3- | TXD- (output) | TXD- (input) |
| 3 | Pair 2+ | RXD+ (input) | RXD+ (output) |
| 4 | Pair 1+ | RTS+ (output) | RTS+ (input) |
| 5 | Pair 1- | RTS- (output) | RTS- (input) |
| 6 | Pair 2- | RXD- (input) | RXD- (output) |
| 7 | Pair 4+ | CTS+ (input) | CTS+ (output) |
| 8 | Pair 4- | CTS- (input) | CTS- (output) |
| 9 | Shield | RS-485 Ground | RS-485 Ground |
You can use a shielded RJ-45 cable to connect the RS-485 ground between the local and remote units. A shielded cable can reduce noise, which can improve the RS-485 signals, but can also add capacitance, which can reduce the RS-485 data rate.
CHAPTER 4: TROUBLESHOOTING
PROBLEMS/SOLUTIONS
If the units fail to operate, check the following before calling for technical support.
- Are units powered on? Check to see if the power supplies are plugged into a working AC outlet.
- Check to see if the interconnect wire is connected properly. Use a straight-through CAT5 or CAT6 twisted-pair cable, because the local and remote units swap transmit and receive pins.
- Try a lower baud rate if possible to make sure the baud rate is not too fast for the length of cable.
- Check the DB9 cable connections. The local unit has a DB9 female connector, and is intended for connection to a PC or data terminal equipment. The remote unit has a DB9 male connector, and is intended for connection to a modem or data communication equipment.
CONTACTING BLACK BOX
If you determine that your CATx DB9 Line Driver is malfunctioning, do not
attempt to alter or repair the unit. It contains no userserviceable parts.
Contact Black
Box Technical Support at 724-746-5500
or info@blackbox.com.
Before you do, make a record of the history of the problem. We will be able to
provide more efficient and accurate assistance if you have a complete
description, including:
- the nature and duration of the problem
- when the problem occurs
- the components involved in the problem
- any particular application that, when used, appears to create the problem or make it worse
SHIPPING AND PACKAGING
If you need to transport or ship your CATx DB9 Line Driver:
- Package it carefully. We recommend that you use the original container.
- If you are returning the unit, make sure you include everything you received with it. Before you ship for return or repair, contact Black Box to get a Return Authorization (RA) number.
APPENDIX: REGULATORY INFORMATION
A.1 FCC STATEMENT
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 inter ference 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 B 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 emis
sion from digital apparatus set out in the Radio
Interference Regulation of Industry Canada.
TRADEMARKS USED IN THIS MANUAL
Black Box and the Double Diamond logo are registered trademarks of BB
Technologies, Inc.
Any other trademarks mentioned in this manual are acknowledged to be the
property of the trademark owners.
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