PCI Express 4-Port RS-232, RS-422, RS-485, RS-530, RS-530A, V.35 Synchronous Serial Interface (uses Z85230)

Part: 5402e   Model: ACB-MP+4.PCIe

(2 customer reviews)


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The 5402e is a PCI Express synchronous serial interface that provides four ports individually configurable for RS-232, RS-422, RS-485, RS-530, RS-530A or V.35. Designed using the popular Zilog Z85230 Enhanced Serial Communication Controller (ESCC), the synchronous serial adapter is an ideal solution for military, satellite, radar, banking and other applications that require robust synchronous communications.

In RS-232 mode, all common modem control signals are implemented for compatibility with a wide range of peripherals. A digital phase lock loop (DPLL) is included on each port, and the board supports data rates up to 128K bps in burst mode. For easy implementation, a fan-out cable is included that terminates the onboard 100-pin SCSI-style connector to four DB-25M connectors. Terminal blocks, adapter cables, and other helpful accessories are available to simplify installation.

Software support, critical for successful synchronous communication development, is provided through Sealevel’s SeaMAC synchronous serial driver. HDLC/SDLC protocols are supported as well as certain configurations of Monosync, Bi-sync and Raw modes.


Additional information

Communications Chip


Communications Controller


Electrical Interface

RS-232, RS-422, RS-485, RS-530, RS-530A

Humidity Range

10 – 90% Relative Humidity, Non-Condensing

Host Interface(s)

PCI Express

Max Data Distance

50 feet (RS-232), 4000 feet (RS-485)

Max Data Rate

128K bps (burst)

Operating Temperature

0°C to 70°C (32°F to 158°F)

PC Bracket

Low Profile, Standard Height

# of Ports


RoHS Compliant


Serial Connector(s)


Storage Temperature

-50°C to 105°C (-58°F to 221°F)



  • Compliant with RoHS and WEEE directives
  • Each port individually configurable for RS-232, RS-422, RS-485, RS-530, RS-530A or V.35
  • Z85230 Enhanced Serial Communications Controller (ESCC)
  • Data rates to 128K bps (Burst mode)
  • All modem control signals implemented
  • PCI Express X1 compliant
  • Compatible with any low profile PCI Express slot. A standard profile bracket  is also included
  • Included fan-out cable terminates 100-pin SCSI-style board connector to four DB-25M connectors (Item# CA339)


Datasheet: 5402e

2 reviews for ACB-MP+4.PCIe

  1. cdm

    Incorporation of the SeaLevel 5402e into Mission Critical .NET Applications
    We have tested the SeaLevel 5402e Sync Serial Adapter extensively for use in both our testing and operationally deployed workstations.
    The 5402e was selected over other synchronous adapter because we found its low level API to be very amendable to incorporation into the .NET managed runtime environment.
    We have been successful creating a flexible and robust .NET library around the 5402e and have discovered very few low level issues that could not be worked in the C# environment.
    This has allowed us to take full advantage of creating rich user friendly applications that are also very well behaved from a memory management and performance perspective.
    We would strongly recommend to any development team working in this area of serial communications to look into the 5402e as an excellent product choice.

  2. Dan

    Sealevel’s 5402e was an easy upgrade from Sealevel’s 5104 pci card.
    The 5402e was an easy solution when upgrading from Sealevel’s 5104 pci card. The 5402e pretty much worked out of the box with only some minor setting issues that where quickly resolved with Sealevel’s great technical support. Our application ported over and incorporated with Sealevel’s seamac driver seamlessly. When recently upgrading to a new Linux kernel (3.11) there was a problem compiling the driver to work with this new kernel. Sealevel’s technical support had a kernel patch the next day and our application is again up and running.

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