Black Box ME500A User Manual

BLACK BOX

ME500A

Industrial Line Driver

Async Sync

DB25

Female

Conn.

1 2 3 4 5 6 7 8

1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8

ON

PWR

TX

RX

RTS

CD

PWR TX RX CDRTS ERROR TEST

511

511E

Remote
Normal
Local

SPECIFICATIONS:

Transmission Format: Synchronous or Asynchronous, 2-wire/half duplex or 4-wire/full or half duplex.
Interface: RS-232 (CCITT V.24) connection via DB25 female; Twisted-pair connection via RJ-45
Transmission Line: 2- or 4-wire UTP, 19 to 26 AWG.
Data Rates: Synchronous or Asynchronous at 1.2, 1.8, 2.4, 3.6, 4.8, 7.2, 9.6, 14.4, 19.2, 28.8, 38.4, 57.6,

Clocking: Internal, External, or Receive Recover.
Controls: Carrier Constantly ON or Controlled by RTS; RTS/CTS delay set to no delay, 7 ms, or 53 ms.
Applications: Point-to-Point or Multipoint.
Indicators: Mono-color LED's for TX, RX, RTS, and CD; Single LED's for Power, Test, and Error.
RTS Anti-Stream Timer: 12.5 sec., 50 sec., or disabled (switch-selectable); Tolerance: +50%, -0.
Diagnostics: V.52-compliant bit-error-rate pattern (511/511E pattern) generator and detector with

Transformer Isolation: 2000 V RMS.

and 64 kbps. (Switch-selectable)

error-injection mode; V.54 compliant--Local Analog Loopback and Remote Digital Loopback,
activated by front-panel switch or via RS-232 interface.

ERROR

TEST

TOGGLE

SWITCHES

BOTTOM OF UNIT

INTRODUCTION:

The Async/Sync Industrial Line Driver operates 2-wire (half-duplex) or 4-wire (full- or half-duplex), in synchronous or asynchronous
modes, over unconditioned telephone lines. The Line Driver supports data rates up to 64 kbps. It operates in synchronous mode between
the local and remote modems; when connected to an asynchronous RS-232 device, the Line Driver converts the asynchronous data to
synchronous data.
To enhance overall performance, the Line Driver features equalization, anti-streaming timer, transformer isolation (to guard against data
loss due to ground-potential differences), and Silicon Avalanche Diode surge protection (to guard against data-lone transients).
The Async/Sync Industrial Line Driver features V.52-compliant bit-error-rate pattern tests and two V.54 test modes (local analog loopback
and remote digital loopback). The operator at the local end can test both local and remote modems, plus the line, in the digital-loopback mode.
Both RDL and LAL modes can be controlled by a manual switch or via the V.24/RS-232 interface.

Surge Protection: Immune to IEC-801-5 Level 2, 1kv.
Power Supply: 100 to 242 VAC Universal Interface.

CONFIGURATION:

Configuration Switches:

The Async/Sync Industrial Line Driver uses 24 external mini DIP switches that allow configuration to an extremely wide range of
applications. These 24 DIP switches are grouped into three eight-switch sets, and are externally accessible from the underside of
the unit. Since all configuration DIP switches are externally accessible, there is no need to open the case for configuration.
The configuration switches allow you to select data rates, clocking methods, V.52 and V.54 tests, word lengths, extended signaling
rates, async or sync mode, 2- or 4-wire operation, anti-stream control, and input impedance.

POSITION FUNCTION FACTORY DEFAULT

S1-1
S1-2
S1-3
S1-4

S1-5
S1-6

S1-7 ASYNC/SYNC ON ASYNC
S1-8 CARRIER CONTROL OFF Constantly ON

Switches S1-1 through S1-4 and S3-3: Data-Rate Setting are set in combination
to determine the asynchronous and synchronous data rate for the Async/Sync
Industrial Line Driver. Refer to Data-Rate chart to the right.

Switches S1-5 and S1-6: Clock Source are set in combination to determine the
transmit clock source for the Async/Sync Industrial Line Driver.

S1-5 S1-6 Setting:

ON ON Internal Transmit Clock
OFF ON Receive Recover Clock
ON OFF External Transmit Clock

Switch S1-7: Asynchronous/Synchronous Mode are set in combination to
determine the asynchronous and synchronous data rate for the Async/Sync Industrial
Line Driver.

S1-7 Setting:

ON Asynchronous
OFF Synchronous

Switch S1-8: Carrier-Control Method determines whether the carrier is Constantly
On or Controlled by RTS. This setting allows for operation in switched carrier,
multipoint, and /or hardware-handshaking applications.

S1-8 Setting:

OFF Constantly On
ON Controlled by RTS

DATA RATE
DATA RATE
DATA RATE
DATA RATE

CLOCK SOURCE
CLOCK SOURCE

ON
OFF 9600 bps
OFF
ON

ON
ON INTERNAL

Data Rate Settings:

S1-1 S1-2 S1-3 S1-4 S3-3

ON

OFF

ON

OFF

ON

OFF

ON
OFF
OFF

ON
OFF
OFF

ON
OFF
OFF

ON

ON
OFF
OFF

ON

ON
OFF
OFF

ON

ON

ON
OFF

ON

ON

ON

ON
ON
ON

ON
OFF
OFF
OFF
OFF
OFF

ON

ON
OFF
OFF
OFF

ON

ON OFF
ON OFF
ON OFF
ON OFF
ON OFF
ON OFF
ON OFF
ON

ON
OFF
OFF

ON
OFF
OFF
OFF

OFF

ON
OFF
OFF

ON
OFF
OFF

ON

* MUST HAVE SW3-3 ON.

SETTING (kbps)

1.2

1.8

2.4

3.6

4.8

7.2

9.6

14.4
16*

19.2

28.8
32*

38.4

57.6
64*

POSITION FUNCTION FACTORY DEFAULT

S2-1
S2-2

S2-3
S2-4

S2-5
S2-6

S2-7

WORD LENGTH
WORD LENGTH

Extended Signaling Rate

RTS/CTS DELAY
RTS/CTS DELAY

2-WIRE/4-WIRE
2-WIRE/4-WIRE

OFF
OFF 10 BITS

OFF -2.5% to 1%
ON

ON 7 ms
ON

OFF (4-WIRE) FDX

S2-8 V.54 OFF V.54 Enabled

POSITION FUNCTION FACTORY DEFAULT

S3-1
S3-2

S3-3
S3-4
S3-5
S3-6

S3-7
S3-8

INPUT IMPEDANCE
INPUT IMPEDANCE

TIMING MODE

TOPOLOGY

LOCAL LOOPBACK

REMOTE LOOPBACK

Anti-Stream Control
Anti-Stream Control

ON
OFF 200 ohms

OFF
ON Point-to-Point
OFF Disabled
OFF Disabled

OFF
OFF Disabled

Switches S2-1 and S2-2: Word Length are set in combination to determine the word

length for asynchronous data, including the start and stop bits.
S2-1 S2-2 Setting:

OFF ON 8 bits
ON ON 9 bits
OFF OFF 10 bits
ON OFF 11 bits

Switch S2-3: Extended Signaling Rate determines the range of variability the
Async/Sync Industrial Line Driver "looks for" in asynchronous data rates (that is, the

actual variance from a given frequency level the Line Driver will tolerate).
S2-3 Setting:

OFF -2.5% to +1%
ON -2.5% to +2.3%

Switches S2-4 and S2-5: RTS/CTS Delay determines the amount of delay between
the time the Line Driver "sees" RTS and when it sends CTS. Options are no delay
7 ms, and 53 ms.

S2-4 S2-5 Setting:
ON ON 7 ms
OFF ON 53 ms
ON OFF No Delay
OFF OFF No Delay

Switches S2-6 and S2-7: 2-wire/4-wire Mode Selection determines whether the
Async/Sync Industrial Line Driver is operating in 2-wire or 4-wire mode.

S2-6 S2-7 Setting:
ON ON 4-wire (half-duplex)
ON OFF 4-wire (full-duplex)
OFF ON 2-wire (half-duplex)

Switch S2-8: V.54 Loopback Test Enable enables or disables V.54 looping in the

Async/Sync Industrial Line Driver.
S2-8 Setting:

OFF V.54 Normal Operation Enabled
ON V.54 Testing Disabled

Switches S3-1 and S3-2: Input Impedance determines the Line Driver's input

impedance. This allows you to choose the optimum impedance setting for
your application. In long-distance applications, the impedance of the cable
must match the impedance of the load (or resistor) of the Async/Sync
Industrial Line Driver. Thicker-gauge cables require a lower-ohm setting,
while a thinner-gauge cable should receive a higher-ohm setting. If you are
using higher speeds, you will need a lower-ohm setting and a higher-ohm
setting for the slower speeds. Refer to Speed Selection Table.

S3-1 S3-2 Setting:
ON ON 130 ohms
ON OFF 200 ohms
OFF ON 320 ohms
OFF OFF High Impedance (minimum 2k ohms)

Switch S3-3: Timing-Mode Selection selects the Line Driver's timing mode. To

operate the Line Driver at 16, 32, or 64 Kbps, set S3-3 to the ON position. To
select any other DTE rate, set switch S3-3 OFF.

S3-3 Setting:
ON 16, 32, and 64 Kbps
OFF 1.2 through 57 Kbps, excluding 16 and 32 Kbps.

Switch S3-4: Topology selects the topology of the Async/Sync Industrial Line Driver.

S3-4 Setting:
ON Point-to-Point
ON Master Multipoint
OFF Slave Multipoint

Switch S3-5: RS-232 Initiation of Local Loopback Test determines whether or not
the Async/Sync Industrial Line Driver local analog loopback test can be initiated by
raising pin 18 on the RS-232 interface.

S3-5 Setting:
ON RS-232 initiation enabled
OFF RS-232 initiation disabled

Switch S3-6: RS-232 Initiation of Remote Loopback Test

determines whether or not the Async/Sync Industrial Line Driver remote
digital loopback test can be initiated by raising pin 21 on the RS-232
interface.

S3-6 Setting:
ON RS-232 initiation enabled
OFF RS-232 initiation disabled

Switches S3-7 and S3-8: Anti-Stream Control are set in
combination to determine the time-out period for the Line Driver's anti­stream control timer.

S3-7 S3-8 Setting:
OFF OFF Disabled
OFF ON 12.5 seconds
ON OFF 50 seconds
ON ON 12.5 seconds

Cable

Gauge

19 AWG
22 AWG
24 AWG
26 AWG

1.2 1.8 2.4 3.6 4.8 7.2 9.6 14.4 16
320 320
320

320

320

320

320

320

Cable

Gauge

19 AWG
22 AWG
24 AWG
26 AWG

19.2 28.8 32 38.4 57.6 64
130
130
200
200

Data Rates (kbps)

200

200 200 200 200 130 130
320
320
320

200 200

320

320

200
320

200

200 200 200

200

200

200

200

Data Rates (kbps)

130
130
130
200

130
130
130
200

130
130
130
130

HIGH HIGH
HIGH HIGH
HIGH HIGH
HIGH HIGH

200 200
200 200

INSTALLATION:

The Async/Sync Industrial Line Driver operates in four twisted-pair topologies:
2-wire/point-to-point, 2-wire/multipoint, 4-wire/point-to-point, and 4-wire/multipoint. In each of these topologies, the twisted-pair wire must be 19 to 26 AWG dry, unconditioned metallic wire. Dial-up analog circuits, such as those used with a standard Hayes-

type modem, are not acceptable. The twisted pair may be shielded or unshielded. (Both types work well). The Async/Sync Industrial Line Driver has an RJ-45 jack for its twisted-pair line connection. Connect the wire to each Line Driver as described in the

instructions.

Two-Wire Installation:

When communicating over a single twisted-pair circuit, the Async/Sync Industrial Line Driver operates half duplex (that is, it transmits in only one direction at a time). This is effective for both point-to-point and multipoint applications. In single-pair point-to-point
applications, you will need a pair of Async/Sync Industrial Line Drivers for each circuit (one at each end of the single-pair wire). In single-pair multipoint applications you'll need three or more Async/Sync Line Drivers. These can be connected using a daisychain or
star topology.

Two-wire cable connection via RJ-45:

RJ-45 Signal:
1 N/C
2 GND
3 RCV­ 4 XMT+
5 XMT­ 6 RCV+
7 GND
8 N/C
Connection to ground is optional

Signal: Pin# Pin# Signal:
XMT+ 4 4 XMT+
XMT- 5 5 XMT-

Four-Wire Installation:

When communicating over a two-twisted-pair circuit, the Line Driver can operate full or half duplex, point-to-point or multipoint. In two-pair point-to-point applications, you'll need a pair of Line Drivers for each circuit (one at each end of the two-pair cable). In two­pair multipoint applications, you'll need three or more Line Drivers. These can be connected using a daisychain or star topology.

Signal: Pin# Pin# Signal:
XMT+ 4 6 RCV+
XMT- 5 3 RCV­RCV+ 6 4 XMT+
RCV- 3 5 XMT-

Multipoint operation involves the connection of several terminals to one host port. In such an application, one local Async/Sync Line Driver is used as a master unit, and it is connected to several remote Async/Sync Line Drivers that are acting as slaves. In a
multipoint environment, the master Line Driver transmits continually. Initiation of two-way communication is RTS-controlled by each slave Line Driver. To facilitate multipoint communication, the master Line Driver should have its carrier-control DIP switch set to
Constantly ON (S1-8 = OFF). Each slave Line Driver should have its carrier-control DIP switch set to Constantly ON by RTS (S1-8 = ON). The figure on the next page shows a typical Line Driver multipoint application.

Four-wire cable connection via RJ-45:

Connection to ground is optional

Four-wire, Multipoint Installation:

1 2 3 4 5 6 7 8

2-W POINT-to-POINT APPLICATION

1 2 3 4 5 6 7 8

4 XMT+ XMT+ 4
5 XMT- XMT- 5

CONNECTION TO GROUND IS OPTIONAL

4-W POINT-to-POINT APPLICATION

1 2 3 4 5 6 7 8

1 2 3 4 5 6 7 8

3 RCV- XMT- 5
4 XMT+ RCV+ 6
5 XMT- RCV- 3
6 RCV+ XMT+ 4

CONNECTION TO GROUND IS OPTIONAL

4-W POINT-to-MULTIPOINT APPLICATION

3 RCV- XMT- 5
4 XMT+ RCV+ 6
5 XMT- RCV- 3
6 RCV+ XMT+ 4

XMT- 5
RCV+ 6
RCV- 3
XMT+ 4

1 2 3 4 5 6 7 8

1 2 3 4 5 6 7 8

1 2 3 4 5 6 7 8

OPERATION:

Once you've configured each Async/Sync Line Driver and connected the twisted-pair and RS-232 cables, you're ready to operate the Line Drivers.

The Line Drivers have seven front-panel status LED's that indicate the condition of the Line Driver and communication link.
The Power LED lights green to signal that power is present. The TX and RX indicators blink green with data activity. Off indicates a low RS-232 logic level, solid green indicates a high RS-232 logic level.

These indicators will be off for a low signal or green for a high signal. RTS lights for an incoming signal on RS-232 pin 4. CD lights for an incoming signal on the line side, and the resulting output signal on RS-232 Pin 8.

The yellow Test LED indicates that V.52 or V.54 tests are running.

The Error indicator LED has two functions:

LED Status Monitors:

The power, TX, and RX Indicators:

Note:

RS-232 devices idle in a low state, so the LED will be off if the

connections are correct and the RS-232 device is in an idle state.

The RTS and CD Indicators:

The Test Indicator:

The Error Indicators:

1. When the Line Drivers are in test mode (green Test LED is lit), the Error LED glows red when bit errors occur.

2. When not in test mode (green Test LED is off), the Error LED indicates an RTS streaming condition.