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Small beige DB9 null-modem adapter with male and female ends

Monoprice Inc.

Monoprice Inc. 1203 DB9 Male/Female Mini Null Modem Adapter

SKU CH-QVXV-5TX1Y MPN 1203

A DB9 null-modem adapter with male and female connectors in a mini form factor

  • Adapter typeAdapters & Splitters
  • DB9 male-to-female null-modem wiring enables direct serial device links
  • Mini form factor fits tight panel cut-outs and crowded ports
  • Lifetime warranty from Monoprice backs long-term reliability
  • Model 1203 identifies the exact adapter for re-orders
  • First listed in 2018, established design with proven compatibility

DB9 Null Modem Mini Adapter

The Monoprice 1203 is a DB9 male-to-female mini null modem adapter designed to cross transmit and receive lines for direct serial device communication. It fits legacy equipment requiring a straight-through gender change with null modem wiring. The compact form factor suits tight panel spaces where a full-size cable hood would interfere. Model 101203 carries the Monoprice lifetime warranty.

Suits Direct Serial Links, Not Straight Extensions

This adapter serves technicians connecting two DTE ports such as a PC and a legacy instrument without a separate crossover cable. It will not work for simple gender changes on a straight-through cable run because the internal pinout swaps signal lines. Buyers needing a straight pin-to-pin gender changer should look at a different wiring configuration.

Null Modem Pinout Decides Compatibility

The single specification that determines fit is the internal null modem crossover wiring between the DB9 male and female contacts. If the target connection requires straight-through pin mapping this adapter will fail to pass data. Verify the host device documentation calls for a null modem crossover before purchasing.

How it compares

Measured against everything we stock in Other Adapters & Couplers, at today’s prices. Recalculated every night.

Price $4.99
Cheaper than about 93% of the 1,761 comparable items (median $18.99).

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Specifications

Product
Brand nameMonoprice
Model name101203
Adapter typeAdapters & Splitters
Size & build
Shipping weight0.05 kg
Package size25 × 25 × 25 mm

Questions about this item

What DB9 interface does the 1203 adapter use, and what signal crossover does it provide?

It is a DB9 male-to-female null-modem adapter that crosses transmit and receive lines so two DTE devices can communicate directly without a modem.

What physical clearance does the mini null-modem adapter need to fit between connected cables?

The mini form factor keeps the body short enough to sit between two standard DB9 cables without blocking adjacent ports on dense patch panels.

How do you install the Monoprice 101203 null-modem adapter, and what common mistake should be avoided?

Screw the male end into the first device's DB9 port, then attach the female end to the second device's cable; do not force the gender orientation or the signal crossover will not match.

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