CI-134 Series

4-port RS-422/485 ISA serial boards

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Evaluation units available for online purchase
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Phase-out and Last Buy Notice

The CI-134 Series will be discontinued starting from July 1, 2017 . The deadline for placing a final purchase order is December 1, 2017. Due to the limited availability of these products, orders will be processed till we run out of stock.
For alternative solution, please 
 visit our ISA Serial Boards.


Features and Benefits 

  • Cost-effective ISA boards with 4 RS-422/485 ports
  • RS-485 data direction control with ADDC® or by RTS
  • 921.6 kbps maximum baudrate for super fast data transmission
  • 16-byte FIFO and on-chip hardware flow control
  • Surge protection and electrical isolation available
  • Built-in termination resistors



The CI-134 series ISA boards come with 4 independent RS-422/485 serial ports for connecting data acquisition equipment and other serial devices to a PC. Connect your devices over longer distances—up to 1.2 km (4000 ft)—and ensure greater reliability in industrial environments with on-board surge protection and electrical isolation (available with some models). Enjoy greater versatility by using point-to-point full duplex connections, or set up a half duplex RS-485 multi-drop network.

Comm. Controller 16C550C or compatible x 4
Bus 16-bit ISA
Connector DB37 female
Serial Interface
Number of Ports 4
Serial Standards RS-422/485
Max. No. of Boards per PC 4
Serial Line Protection
Electrical Isolation 2 kV (CI-134I/IS only)
Baudrate 50 bps to 921.6 kbps
Built-in Termination Resistor 120 ohm (enabled by jumper for RS-485-2w)
Serial Communication Parameters
Data Bits 5, 6, 7, 8
Stop Bits 1, 1.5, 2
Parity None, Even, Odd, Space, Mark
I/O Address 0x0000-0xFFFF (default = 0x180)
IRQ 2 (9), 3, 4, 5, 7, 10 (default), 11, 12, 15
Serial Signals
RS-422 TxD+(B), TxD-(A), RxD+(B), RxD-(A), RTS+(B), RTS-(A), CTS+(B), CTS-(A), GND
RS-485-4w TxD+(B), TxD-(A), RxD+(B), RxD-(A), GND
RS-485-2w Data+(B), Data-(A), GND
Physical Characteristics
Dimensions CI-134: 85 x 160 mm (3.35 x 6.30 in)
CI-134I/IS: 110 x 180 mm (4.33 x 7.09 in)
Driver Support
Windows Windows 95/98/ME/NT/2000, Windows XP/2003/Vista/2008/7/8/8.1 (x86/x64), Windows 2008 R2/2012/2012 R2 (x64), Windows 3.x, DOS, Windows Embedded CE 5.0/6.0, Windows XP Embedded
Linux Linux 2.4.x, 2.6.x, 3.x
Unix-like Systems QNX 6, SCO OpenServer, UnixWare 7, Solaris 10, FreeBSD
Note: Please refer to Moxa’s website for the latest driver support information.
Environmental Limits
Operating Temperature 0 to 55°C (32 to 131°F)
Storage Temperature -20 to 85°C (-4 to 185°F)
Ambient Relative Humidity 5 to 95% (non-condensing)
Standards and Certifications
EMC EN 55032/24
EMI CISPR 32, FCC Part 15B Class B
EMS IEC 61000-4-2 ESD: Contact: 8 kV; Air: 15 kV
IEC 61000-4-3 RS: 80 MHz to 1 GHz: 10 V/m
IEC 61000-4-4 EFT: Signal: 2 kV
MTBF (mean time between failures)
Time 424,655 hrs
Standard Telcordia (Bellcore) TR/SR
Power Requirements
Input Current CI-134: 450 mA @ 5 VDC
CI-134I: 610 mA @ 5 VDC
CI-134IS: 620 mA @ 5 VDC
Warranty Period 5 years
Details See

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Available Models

  Model No. Description
CI-134-DB9M 4-port RS-422/485 ISA serial board (includes DB9 male cable)
CI-134I-DB9M 4-port RS-422/485 ISA serial board with optical isolation (includes DB9 male cable)
CI-134IS-DB9M 4-port RS-422/485 ISA serial board with optical isolation and surge protection (includes DB9 male cable)

Optional Accessories

Connection Cables
  Model No. Description
CBL-M37M9x4-30 (Opt4D) DB37(M) to 4 x DB9(M) Cable
CBL-M37M25x4-30 DB37(M) to 4 x DB25(M) Cable

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