I found three carrier boards for Jetson AGX Xavier that are rated down to -40 °C and have 4 serial ports. All three are from Diamond Systems.
Matching AGX Xavier carrier boards diamondsys... +2diamondsystems.com ↗“io.serial_port_count=4”diamondsystems.com ↗“thermal.min_operating_temp_c=-40”diamondsystems.com ↗“thermal.min_operating_temp_c=-40”
| Product | Product line | Min. operating temp | Max. operating temp | Serial ports | Cooling |
|---|---|---|---|---|---|
| STEVIE / STV-BB01 | Diamond Stevie | -40 °C | 85 °C | 4 | Fanless |
| Elton / ELT-BB01 | Diamond Elton | -40 °C | Not listed in the catalog | 4 | Fanless |
| Elton / ELT-BB02 | Diamond Elton | -40 °C | Not listed in the catalog | 4 | Fanless |
How they differ:
- STEVIE / STV-BB01 has 2 external USB ports, 2 Ethernet ports (1GbE) and an M-key 2280 M.2 slot. Datasheet diamondsys... +2diamondsystems.com ↗“io.usb_ports=2”diamondsystems.com ↗“io.ethernet_ports=2”diamondsystems.com ↗“io.m2_slots=M-key 2280”
- Elton / ELT-BB01 and ELT-BB02 have no external USB ports or standard Ethernet connectors. Ethernet controller lanes and header interfaces are offered separately. Each board has an M-key 2242 M.2 slot and 1 PCIe slot. Product page diamondsys... +2diamondsystems.com ↗“0 populated standard external Ethernet connectors; controller lanes/header interfaces are separate”diamondsystems.com ↗“io.m2_slots=M-key 2242”diamondsystems.com ↗“io.pcie_slot_count=1”
All three boards also have 2 CAN ports and 13 digital I/O channels, and they take 9–20 V input. diamondsys... +2diamondsystems.com ↗“io.can_port_count=2”diamondsystems.com ↗“io.dio_channel_count=13”diamondsystems.com ↗“power.power_input=9-20 V”
Many AGX Xavier carrier boards don't list a minimum operating temperature or serial port count. Some of them might meet your needs, but I can't confirm it from their listed specs.