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Silver PCMCIA Type II card with single DB9 serial port and isolation markings

SerialGear

SerialGear SG-RS1SIS PCMCIA Single Port RS-422/485 Expansion Card with Isolation

SKU CH-TPAW-B90TW

Adds one isolated RS-422/485 serial port via PCMCIA with 15 KV ESD protection and 921.6 Kbps speed

  • External connectors1 x Serial Port
  • Add a serial port via PCMCIA with 16C950 UART
  • Auto transceiver turn-around handled by ATTA hardware
  • Supports 4-wire RS-422/485 and 2-wire RS-485 modes
  • Isolated port with 15 KV ESD surge protection
  • Works in 32-bit CardBus and 16-bit PCMCIA R7.1 slots

Single-port isolated serial card

The SerialGear SG-RS1SIS adds one isolated RS-422/485 port to a laptop or thin client through a PCMCIA slot. It targets engineers and technicians who need a single protected serial link for industrial equipment or legacy data collection. The CardBus Type-II design works in 32-bit and 16-bit PCMCIA 7.1 sockets. Buyers who need two simultaneous serial ports should choose a dual-port alternative.

Plug-and-play install with legacy caveats

The card uses 16C950 UARTs and installs through a standard wizard that handles I/O addresses and IRQs automatically. No jumpers or DMA settings are required. The main friction point appears on newer operating systems where a signed driver for the PCMCIA bus may be missing, so verify driver availability before purchase.

921.6 kbps headroom for industrial links

The port sustains up to 921.6 kbps in both 4-wire RS-422/485 and 2-wire RS-485 modes, with hardware auto transceiver turn-around managing direction changes. Isolation and 15 kV ESD surge protection shield the host from ground loops and transients. Bandwidth runs out when multiple high-speed devices share one port or when cable runs exceed the electrical limits of the RS-485 standard.

How it compares

Measured against everything we stock in PCIe Expansion Cards, at today’s prices. Recalculated every night.

Price $92.99
Pricier than about 83% of the 891 comparable items (median $30.99).

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Specifications

Product
Model nameSG-RS1SIS
Ports & slots
External connectors1 x Serial Port

Questions about this item

How can I verify the SG-RS1SIS card is operating correctly after installing it in a PCMCIA slot?

The system will recognise the device automatically and install drivers through the Install Wizard without manual I/O address, IRQ or DMA configuration.

What comes with the card and what must I source separately for RS-422/485 connections?

The package includes the PCMCIA expansion card; cables or adapters for 4-wire RS-422/485 or 2-wire RS-485 wiring are not included and must be purchased separately.

Which SG-RS1SIS variant should I choose for isolated 15KV ESD protection and 921.6Kbps speed on a CardBus Type-II slot?

This single-port model provides 15KV ESD surge protection, RS-422/485 operation up to 921.6Kbps, and fits a fully 32-bit CardBus Type-II slot with 16-bit PCMCIA R7.1 backward compatibility.

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