The ESR-901 is an Ethernet to serial device server with a single RJ-45 connector supporting 10/100 Mbps Ethernet speeds. It has an IP30 rating for protection against solid particles and has an operating temperature range of -10 to 80°C.
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| Type | Ethernet to Serial |
| Number of Serial Ports | 1 |
| 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 |
