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Microdriver 9, Short-Haul Modem-B, and Multipoint Line Driver
Send your async data up to several miles
from your computer equipment—without
the expense of a modem.
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A typical application using the High-Speed SHM-B Async, a powered driver
that’s ideal for sending async data point-to-point at speeds up to 115.2 kbps.
(2) twisted pairs
RS-232
cable
RS-232
cable
Async
terminal
Async minicomputer
High-Speed SHM-B Async
(ME802A)
High-Speed SHM-B Async
(ME802A)
Short-Haul Modem-B 2W-A (SHM-B 2W-A)
• Powered, point-to-point, 2-wire.
• A pair of these line drivers enables two RS-232 devices
to communicate at distances up to 2.3 miles (3.7 km)
at 2400 bps over 24 or 26 AWG.
• Local analog loopback circuitry lets you check the
operation of both your local and remote units.
• Distances up to 4 miles (6.4 km) at 2400 bps over
24 AWG wire.
• Speeds up to 19.2 kbps.
• Fully supports hardware handshaking, so you get reliable
performance during every data exchange.
• Two status LEDs monitor transmit and receive lines.
• Loopback circuitry helps you detect line faults via a
front-panel button.
• Standalone and card versions.
The SHM-B Async is an asynchronous, full-duplex, 4-wire
line driver/receiver that, when paired with another SHM-B
Async, enables two EIA-232 devices to communicate at
distances of up to 4 miles (at 2400 bps) over 24 AWG wire
and at data speeds of up to 19.2 kbps.
In addition to the transmitter and receiver circuits, the
SHM-B Async includes EIA-232 control line interfaces, status
monitor LEDs, and a loopback switch.
The SHM-B Async is available in five versions:
• As a standalone 115-VAC model (ME800A).
• As a standalone 115-VAC model with cables included
(ME800A-R3).
• As a standalone 230-VAC model with cables included
(ME800AE-CABPAK).
The SHM-B 2W-A is an asynchronous, full-duplex line driver
and receiver that requires only two wires to transmit data.
A pair of of these SHMs enables two RS-232 devices
to communicate at distances of up to 2.3 miles (3.7 km)
and at bit rates of up to 19.2 kbps, while fully supporting
hardware handshaking.
The SHM-B 2W-A operates over a two-wire metallic circuit.
Optimum performance is obtained with 22 to 26 AWG
twisted-pair telephone cable, but you can use nearly any
twisted-pair cable, with little or no performance degradation.
In addition to the transmitter and receiver circuits, the
modem includes RS-232 control-line interfaces, status monitor
LEDs, and a loopback switch.
• As a rackmount card version (ME805-C).
• As a rackmount card version with cables included
(ME805C-R3).
A powered device, the SHM-B 2W-A is available in stand-
alone 115-VAC (ME755A) or 230-VAC (ME755AE) versions and
as a card version (ME755-C) for mounting in our 8- or 16-Card
Short-Haul Modem-B Rack.
The SHM-B is designed to operate over a 4-wire metallic
circuit, and it works best when used with twisted-pair cable.
However, you can use most types of twisted-pair cable, often
with little or no performance degradation.
It’s also designed for maximum operator safety—there are
no voltages greater than 12 VDC or 16 VAC present on the
circuit board of the unit. Receive lines are protected from
potential ground differences through optical isolators rated
at 1500 volts.
Short-Haul Modem-B (SHM-B) Async
• Ideal for most any point-to-point, 4-wire, full-duplex
application.
• Equipped with a balanced loop interface and optical
isolation circuitry, providing protection from differences
in ground potential between areas.
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A typical application in which multiple LD485A-MPs
are used for 4-wire, multipoint communications.
Industrial controller
LD485A-MP
(ME836A-R5)
LD485A-MPs
(ME836A-R5)
PLCs
High-Speed Short-Haul Modem-B (SHM-B) Async
• Powered, point-to-point, 4-wire.
• Speeds up to 115.2 kbps.
• Ideal for applications where data speed is crucial.
• Uses two unshielded twisted pairs.
• Includes optical isolation to protect against surge damage.
• Switch-selectable for DTE or DCE equipment.
RS-232/RS-485 Multipoint Line Driver (LD485A-MP)
• Powered, point-to-point or multipoint, 2- or 4-wire.
• Provides high-speed service (64 kbps) for large multipoint
installations (up to 64 drops).
• Works with any DTE that can be polled, regardless of the
DTE’s RTS support.
• User-selectable port-timeout feature automatically disables
a port once it finishes transmission.
• Operates in 2-wire half-duplex or 4-wire full-duplex mode.
• Maximum distances of 4 miles (6.4 km) at 1200 bps over
24 AWG wire.
Here‘s the ideal line driver for multipoint installations
where you want to link many terminals—each with its own
line driver—to a computer via one master line driver. Use it,
for instance, in high-speed and polling applications.
Depending on the operating environment, as many as 64
devices can be linked together using twisted-pair cable.
You can also use the RS-232/RS-485 Multipoint Line Driver
in point-to-point installations until you upgrade to a multi-
point environment.
And it operates as an RS-232 to RS-485 interface converter,
enabling an RS-232 device to transmit data over much longer
distances than is normally possible (up to 4 miles at 1200 bps).
Although it’s designed specifically to connect to other
RS-232/RS-485 Multipoint Line Drivers, you can connect the
RS-485 port to any device with an RS-422 or RS-485 interface.
Connect, for instance, RS-485 and RS-422 devices to the same
LD485A-MP in an industrial application.
• Available in both standalone and rackmount card versions.
With a pair of High-Speed SHM-B Async units, two RS-232
devices can communicate at speeds of up to 115.2 kbps!
Data travels at this rate when the SHMs are configured for
1.5-mile (2.4-km) distances. To get the greatest distance—up
to 4 miles (6.4 km) over 24 AWG wiring—set them to operate
at 2400-bps speeds.
Along with transmitter and receiver circuits, the High-
Speed SHM-B Async includes EIA-232 control-line interfaces,
status monitor LEDs, and a loopback switch. The High-Speed
SHM-B Async is available in both standalone versions (ME802A
or ME802A-R3) and a rackmount card version (ME802C).
Use these SHMs with 4-wire metallic circuits, with twisted-
pair cable offering the best performance. And although you
can use most types of twisted-pair cable, to achieve maximum
performance, we recommend that you use CAT4 or CAT5 UTP
cable.
Because there are no voltages greater than 9 VDC or
17 VAC present on the circuit board of the High-Speed SHM-B
Async, it offers maximum operator safety. Receive lines are
protected from potential ground differences through optical
isolators rated at 2500 volts.
Plus, the SHM offers easy installation. Because it‘s switch-
selectable for either DTE or DCE equipment, you won’t need
any special cross-pinned cables; it works with the modular
RJ cable that’s already installed in your building.
The line driver also features a manual loopback test,
so you can check the system wiring for both the RS-232 and
RS-485 interfaces. In addition, transient protection on the
RS-485 interface helps prevent damage from voltage
transients on the data line.
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Special circuitry within the driver lets it work with any
DTE that can be polled, regardless of the DTE’s RTS support,
so you get total compatibility with your DTE hardware.
The RS-232/RS-485 Multipoint Line Driver can be jumpered
for a user-selectable port timeout. After the last character
is sent from one of the ports and a specified period of time
passes, the line driver disables any transmission from that port.
This way, a single port won’t monopolize your network.
You can order the RS-232/RS-485 Multipoint Line Driver
in standalone 115-VAC (ME836A-R5), standalone 230-VAC
(ME836AE-R3), and rackmount card (ME836C-R5) versions.
Cables are included with the 115-VAC standalone model
and the rackmount card model.
TECH SPECS
All Models:
SHM-B Async
Protocol: Asynchronous
(ME800A, ME800A-R3, ME800AE-CABPAK, ME805-C, ME805C-R3)
Distance (Maximum) — 24 AWG: 4 mi. (6.4 km) at 2400 bps
Operation — 4-wire full-duplex, point-to-point
Speed (Maximum) — 19.2 kbps
Microdriver 9
(ME790A-M, ME790A-F, ME792A-MSP, ME792A-FSP, ME794A-M,
ME1794A-F, ME1791A-F)
Distance (Maximum) — 24 AWG: 17 mi. (27.4 km) at 1200 bps
Operation — 4-wire full-duplex, point-to-point
Speed (Maximum) — 19.2 kbps
Interface — RS-232
Connectors —
ME790A-M, ME792A-MSP: (1) DB9 M, (1) RJ-11 F;
ME790A-F, ME792A-FSP: (1) DB9 F, (1) RJ-11 F;
ME794A-M: (1) DB9 M, (1) RJ-45 F;
ME1794A-F: (1) DB9 F, (1) RJ-45 F;
ME1791A-F: (1) DB9 F, (1) 5-screw terminal block
Power — From the RS-232 interface
Size — 1.2"H x 0.75"W x 2.5"D (3 x 1.9 x 6.4 cm)
Weight — 0.6 lb. (0.3 kg)
Interface — RS-232
Connectors — (1) DB25 F, (1) 4-screw terminal block
Power — ME800A, ME800A-R3: External 115 VAC, 60 Hz 10%, 5 watts;
ME800AE-CABPAK: Primary: 230 VAC 10%, 50–60 Hz;
Secondary: 17 VAC, 700 mA;
ME805-C, ME805C-R3: From the ME810 or RM007 rack
Size — Standalone: 1.5"H x 4.3"W x 4.5"D (3.8 x 10.9 x 11.4 cm)
Weight — Standalone: 1.3 lb. (0.6 kg)
ME790A-M
High-Speed SHM-B Async (ME802A, ME802A-R3, ME802C)
Distance (Maximum) — 24 AWG: 4 mi. (6.4 km) at 2400 bps
Operation — 4-wire full-duplex, point-to-point
Speed (Maximum) — 115.2 kbps
Interface — RS-232
Connectors — (1) DB25 F, (1) 4-screw terminal block
Power — ME802A, ME802A-R3: External 115 VAC, 60 Hz;
ME802C: From the ME810 or RM007 rack
Size — Standalone: 1.5"H x 4.4"W x 4.1"D (3.8 x 11.2 x 10.4 cm)
Weight — Standalone: 2 lb. (0.9 kg)
SHM-B 2W-A
(ME755A, ME755AE, ME755-C)
Distance (Maximum) — 24 AWG: 2.3 mi. (3.7 km) at 2400 bps
Operation — 2-wire full-duplex, point-to-point
Speed (Maximum) — 19.2 kbps
Interface — RS-232
Connectors — (1) DB25 F, (1) 2-screw terminal block
Power —
ME755A: External 115 VAC, 60 Hz;
ME755AE: External 230 VAC, 50 Hz;
ME755-C: From the ME810 or RM007 rack
Size — Standalone: 1.5"H x 4.3"W x 4.5"D (3.8 x 10.9 x 11.4 cm)
Weight — Standalone: 1.3 lb. (0.6 kg)
RS-232/RS-485 Multipoint Line Driver (ME836A-R5, ME836AE-R3,
ME836C-R5)
Distance (Maximum) — 24 AWG: 4 mi. (6.4 km) at 1200 bps
Operation — 4-wire full-duplex, 2-wire half-duplex, point-to-point
or multipoint
Speed (Maximum) — 64 kbps
Interface — RS-232 or RS-485
Connectors — (1) DB25 F, (1) 4-screw terminal block (RS-485)
Power — ME836A-R5: External 115 VAC, 60 Hz;
ME836AE-R3: External 230 VAC, 50 Hz;
ME836C-R5: From the RM005 rack
Size — Standalone: 1.8"H x 5.5"W x 8.5"D (4.6 x 14 x 21.6 cm)
Weight — Standalone: 1.8 lb. (0.8 kg)
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Quick Reference Guide
Item
Powered/
Multipoint 2-wire 4-wire
Full
Half-
To
To
64
To
Power
Nonpowered
or
duplex duplex
19.2
115.2
5-wire*
kbps kbps kbps
ME790A-M,
790A-F
Nonpowered
Nonpowered
✓
✓
✓
✓
✓
✓
RS-232 interface, DCE mode: Pins 3, 4, 7
RS-232 interface, DCE mode: Pins 3, 4, 7
RS-232 interface, DCE mode: Pins 3, 4, 7
ME792A-MSP,
792A-FSP
✓
✓
✓
✓
ME794A-M,
1794A-F
Nonpowered
✓
✓
ME1791A-F
Nonpowered
Powered
Powered
Powered
Powered
Powered
Powered
Powered
Powered
Powered
Powered
Powered
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
RS-232 interface, DCE mode: Pins 3, 4, 7
115 VAC, 60 Hz
ME755A
✓
✓
✓
✓
✓
✓
✓
✓
ME755AE
230 VAC, 50 Hz
ME755-C
From the ME810 or RM007 rack
115 VAC, 60 Hz
ME800A
ME800A, 800A-R3
ME800AE-CABPAK
ME805-C, 805C-R3
ME802A, 802A-R3
ME802C
230 VAC, 50 Hz
From the ME810 or RM007 rack
115 VAC, 60 Hz
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
From the ME810 or RM007 rack
115 VAC, 60 Hz
ME836A-R5
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
ME836AE-R3
ME836C-R5
230 VAC, 50 Hz
From the RM005 rack
*Models with 5-wire terminal blocks use one wire for ground.
Item
Code
Item
Code
Microdriver 9 RJ-11
Male
Short-Haul Modem-B (SHM-B) Async (Continued)
Standalone (230-VAC)
ME790A-M
ME790A-F
Female
with Cables
ME800AE-CABPAK
Microdriver 9 RJ-11 with Surge Protection
Male
Female
Microdriver 9 RJ-45
Male
Female
Microdriver 9 5-Screw Terminal Block
Female
Short-Haul Modem-B (SHM-B) 2W-A
Standalone (115-VAC)
Standalone (230-VAC)
Rackmount Card
Rackmount Card
Rackmount Card with Cables
ME805-C
ME792A-MSP
ME792A-FSP
ME805C-R3
(ME805C-R3 includes [1] power supply, [1] 6-foot RS-232 DB25
male/DB9 female cable, and [1] DB25 female/DB9 male
adapter.)
High-Speed Short-Haul Modem-B (SHM-B) Async
Standalone (115-VAC)
Standalone (115-VAC) with Cables
Rackmount Card
(ME802A-R3 includes [1] power supply, [1] 6-foot RS-232 DB25
male/DB9 female cable, and [1] DB9 female/DB9 male adapter.)
For all card versions above, you’ll need a rack…
ME794A-M
ME1794A-F
ME802A
ME802A-R3
ME802C
ME1791A-F
ME755A
ME755AE
ME755-C
Short-Haul Modem-B (SHM-B) Async
Standalone (115-VAC)
Standalone (115-VAC) with Cables
Short Haul Modem-B Rack (16-Card)
Short Haul Modem-B Desktop Rack (8-Card)
RS-232/RS-485 Multipoint Line Driver (LD485A-MP)
Standalone (115-VAC) with Cables
ME810
RM007
ME800A
ME800A-R3
(ME800A-R3 includes [1] power supply, [1] 6-foot RS-232 DB25
ME836A-R5
male/DB9 female cable, and [1] DB25 female/DB9 male adapter.)
Standalone (230-VAC)
ME836AE-R3
ME836C-R5
Rackmount Card with Cables
(ME836A-R5 and ME836C-R5 include [1] 6-foot RS-232 DB25
male to DB25 female cable and [1] DB9 female to DB25 male
adapter.)
For your ME836C-R5 cards, you’ll need a…
Multi-Function Rack (16-Card)
RM005
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