The ESR-904 is a 4-port Ethernet to serial server with a single RJ-45 Ethernet connector and 10/100Mbps Ethernet speed. It has four serial ports and an IP30 rating for protection against solid particles. Operating temperature ranges from -10 to 80°C. The device is designed for use in computing and embedded systems applications.
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| Type | Ethernet to Serial |
| Number of Serial Ports | 4 |
| USB | 0 |
| Number of Ethernet Ports | 1 |
| Ethernet Connector Type | RJ-45 |
| Ethernet Speed | 10Mbps/100Mbps |
| IP Rating | IP30 |
| Min Operating Temperature | -10°C |
| Max Operating Temperature | 80°C |
| RoHS | Yes |
| RoHS Version | 2011/65/EU |
