CM520-52 Series — Five-port industrial cellular gateway
Source filename v1.1.260525 · Technical review edition · PDF
CAIMORECM520-52
Five-port industrial cellular router series
A five-port industrial cellular router series with 4G/5G configurations listed by CAIMORE. It provides one configurable WAN port, four LAN ports and a serial interface for connected equipment.
- Ethernet
- 5 × 10/100 Mbps Ethernet ports
- Serial interface
- 1 × RS232; RS485 available as an ordering option
- DC input
- 6–32 V DC
- Operating temperature
- −35 to +75 °C
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Technical specifications
Options vary by model, hardware revision and firmware.
Key specifications
| Ethernet | 5 × 10/100 Mbps Ethernet ports |
|---|---|
| Serial interface | 1 × RS232; RS485 available as an ordering option |
| DC input | 6–32 V DC |
| Operating temperature | −35 to +75 °C |
Model selection
CM520-52 Series — Five-port industrial cellular gateway · Source filename v1.1.260525 · Source p. 1
| CM520-52F | Cellular: 4G; SIM slots: 1; RS232: Yes; RS485: Optional |
|---|---|
| CM520-52FS | Cellular: 5G; SIM slots: 1; RS232: Yes; RS485: Optional |
| CM520-52FB | Cellular: 4G; SIM slots: 2; RS232: Yes; RS485: Optional |
| CM520-52FBS | Cellular: 5G; SIM slots: 2; RS232: Yes; RS485: Optional |
Industrial platform and protection
CM520-52 Series — Five-port industrial cellular gateway · Source filename v1.1.260525 · Source p. 3
| Processor | Industrial 32-bit processor, 650 MHz; 32 KB D-cache and 64 KB I-cache. The overview identifies MIPS. |
|---|---|
| Wireless / PCB | Industrial wireless module; PCB design following the stated 3H and 3W principles; selected industrial components. |
| Ethernet protection | 1.5 kV electromagnetic isolation. |
| Enclosure | Metal, electromagnetic shielding, enclosure/system isolation, lightning-protection design, IP30. |
| Power protection | 7-35 V DC input; reverse-polarity, overvoltage and overcurrent protection. |
| SIM / serial protection | 1.8/3/5 V push-type SIM/UIM; 15 kV ESD protection. RS232 also described with 15 kV ESD protection. |
| Memory | MMU; Flash 128 Mbit, expandable to 256 Mbit; SDRAM 1 Gbit. Packet buffering and a complete TCP/IP stack are described. |
| Source claims | Wireless modules described as CGD, FCC or CE certified. CGD and the 3000 V test conditions are undefined. A 2010 customer-satisfaction award is cited here; the company table gives 2011. |
External interfaces
CM520-52 Series — Five-port industrial cellular gateway · Source filename v1.1.260525 · Source pp. 4, 6-7
| Ethernet | 5 x 10/100 Mbps Base-T ports; Ethernet IEEE 802-3 / 802-2 as printed; 1.5 kV isolation. |
|---|---|
| WAN / LAN | 1 WAN, configurable as LAN; 4 LAN ports. |
| Terminal serial port | 1 RS232 port, optionally configured as RS485 (specify when ordering). Data bits: 7/8; stop bits: 1/2; parity: none/odd/even; 300-4000000 bit/s; no, hardware or software flow control. Other feature text suggests both ports: Confirmation required. |
| Cellular antennas | SMA female, 50 ohm; optional 3/5/10/15 m extensions. |
| Positioning, optional | GPS and BeiDou. |
| SIM/UIM | 1.8/3/5 V push-type full-size card interface, 15 kV ESD protection; slot count depends on model. |
| Power | 3-pin terminal socket. |
| Indicators | POWER, ONLINE and WIFI. |
| RESET | Restore factory defaults. |
| Wi-Fi applicability | WIFI is printed in the indicator list and WLAN is an optional software-table heading; no Wi-Fi radio table is supplied. Confirmation required. |
Network connectivity and IP functions
CM520-52 Series — Five-port industrial cellular gateway · Source filename v1.1.260525 · Source pp. 5-6
| Network access | APN / VPDN |
|---|---|
| Authentication | CHAP / PAP / MS-CHAP / MS-CHAPv2 |
| Radio system | See cellular radio specifications. |
| LAN protocols | ARP / Ethernet |
| IP applications | Ping, traceroute, DHCP server/relay/client, DNS relay, DDNS, Telnet, SSH, HTTPS, TFTP, FTP and SFTP. |
| Routing | Static and dynamic routes. |
Security and reliability
CM520-52 Series — Five-port industrial cellular gateway · Source filename v1.1.260525 · Source pp. 5-6
| Firewall | Stateful packet inspection (SPI), denial-of-service (DoS) protection, multicast/Ping filtering and access-control lists (ACL). |
|---|---|
| Address translation | NAT, PAT, DMZ, port mapping and virtual servers. |
| Users / AAA | User privilege levels; local authentication, RADIUS, TACACS+ and LDAP. |
| Data security | IPsec VPN, OpenVPN and CA support, including automatic application . |
| Backup | VRRP, interface backup and optional dual-SIM backup; depends on ordered model. |
| Link monitoring | Heartbeat checks and automatic reconnection. |
| Watchdog | Operating self-check and fault self-recovery. |
Management and optional integration
CM520-52 Series — Five-port industrial cellular gateway · Source filename v1.1.260525 · Source pp. 5-6
| WLAN | Marked optional in the software-table heading; confirm ordered configuration. |
|---|---|
| Configuration | Local or remote HTTPS, Telnet and SSH. |
| "Upgrade method" source row | The source actually lists local/remote log output and log retention after power loss. Heading/content mismatch: Confirmation required. |
| SMS, optional | Status inquiry, configuration and restart. |
| On-demand dialing | Data-triggered or SMS-triggered connection; scheduled online/offline operation. |
| Management | SNMP |
| Development / platforms, optional | Python custom development; Amazon AWS; Tencent Cloud; power-industry cloud platforms; Alibaba Cloud and other IoT cloud platforms; centralized management and batch configuration. |
| Industrial protocols, optional | Modbus TCP, Modbus RTU, EtherNet/IP and Modbus TCP Slave. |
Cellular parameters
CM520-52 Series — Five-port industrial cellular gateway · Source filename v1.1.260525 · Source pp. 7-8
| Wireless module | Industrial-grade module. |
|---|---|
| 5G SA/NSA bands | n1/n2/n3/n5/n7/n8/n20/n28/n41/n66/n71/n77/n78/n79 |
| TDD frequency group | LTE TDD: 2600/2300 MHz; UMTS: 2100/900 MHz; GSM: 850/900/1800/1900 MHz; UMTS Rx diversity: 2100/900 MHz. |
| FDD frequency group | LTE FDD: 2600/2100/1800/DD800 MHz (DD800 reproduced as printed); UMTS and UMTS Rx diversity: 2100/900 MHz. |
| Radio schemes | NR/LTE/UMTS/HSPA+/HSDPA/HSUPA/WCDMA/EDGE/GSM |
| 5G NR rate | DL 3.4 Gbps / UL 350 Mbps. Modem theoretical figures, not Ethernet throughput. |
| TDD rates | LTE TDD: DL 68 Mbps / UL 17 Mbps; DC-HSPA+: DL 42 Mb/s (Category 24); HSPA+: DL 28 Mb/s (Category 18); HSDPA: DL 14.4 Mb/s (Category 8); HSUPA+: DL 5.76 Mb/s (Category 6), as printed; WCDMA CS: UL/DL 64 kbps; WCDMA PS: UL/DL 384 kbps. |
| FDD rates | LTE FDD: DL 100 Mbps / UL 50 Mbps; other DC-HSPA+, HSPA+, HSDPA, HSUPA+ and WCDMA values are the same as the TDD table. |
| Transmit power | LTE: 23 dBm; WCDMA/HSDPA: 24 dBm. |
| Receiver sensitivity | <-109 dBm |
| module functions | Data, voice, SMS and fax; actual hardware/firmware applicability Confirmation required. |
Hardware
CM520-52 Series — Five-port industrial cellular gateway · Source filename v1.1.260525 · Source pp. 8-9
| CPU | 650 MHz embedded industrial CPU with MMU |
|---|---|
| Flash / SDRAM | Flash 128 Mbit / SDRAM 1 Gbit, described as expandable. |
Power and environment
CM520-52 Series — Five-port industrial cellular gateway · Source filename v1.1.260525 · Source pp. 8-9
| Input | 7-35 V DC; reverse-polarity, overvoltage and overcurrent protection. |
|---|---|
| Standard supply | 9 V DC / 1.33 A |
| Communication current | Average 430 mA at +9 V DC; registration peak 1.0 A at +9 V DC. |
| Standby | Average <200 mA at +9 V DC. |
| Operating temperature | -35 to +75 °C |
| Extended operation | -40 to +80 °C |
| Storage | -40 to +85 °C |
| Relative humidity | 95%, non-condensing. |
EMC parameters
CM520-52 Series — Five-port industrial cellular gateway · Source filename v1.1.260525 · Source pp. 8-9
Certification scope and test conditions depend on the selected model. Request the applicable documentation.
| ESD | EN 61000-4-2, level 3 |
|---|---|
| Radiated electric field | EN 61000-4-3, level 3 |
| Electrical fast transient | EN 61000-4-4, level 3 |
| Surge | EN 61000-4-5, level 3 |
| Conducted disturbances | EN 61000-4-6, level 3 |
| Power-frequency magnetic field | EN 61000-4-8; horizontal/vertical 400 A/m (level 3), . Confirmation required. |
Physical characteristics
CM520-52 Series — Five-port industrial cellular gateway · Source filename v1.1.260525 · Source pp. 8-9
| Enclosure | Metal, isolated enclosure/system, lightning protection, IP30. |
|---|---|
| Body | 125 x 103.2 x 38 mm, excluding antennas and mounting hardware. |
| Package | 350 x 215 x 88 mm |
| Weight | 0.44 kg |
| Shock / vibration / drop | IEC 60068-2-27 / IEC 60068-2-6 / IEC 60068-2-32 |
Certifications stated
CM520-52 Series — Five-port industrial cellular gateway · Source filename v1.1.260525 · Source pp. 8-9
Certification scope and test conditions depend on the selected model. Request the applicable documentation.
| Domestic | MIIT network-access permit, CCC, EMC, CRCC railway certification and Mo'er high/low-temperature testing. |
|---|---|
| International | CE, FCC, E-mark and RoHS. |
| Scope | Certificate numbers, validity and exact model applicability Confirmation required. |
Terminal definitions
CM520-52 Series — Five-port industrial cellular gateway · Source filename v1.1.260525 · Source p. 10
| 1 | Label: RXD; Description: RS232 receive |
|---|---|
| 2 | Label: TXD; Description: RS232 transmit |
| 3 | Label: GND; Description: Common ground |
| 4 | Label: IO2; Description: I/O channel 2 |
| 5 | Label: GND; Description: Common ground |
| 6 | Label: 485A; Description: RS485 + |
| 7 | Label: 485B; Description: RS485 - |
| 8 | Label: IO1; Description: I/O channel 1 |
System connectivity
From field equipment to your system.
See how CM520-52 fits into your installation.
Illustrative connection architecture. External equipment and customer software are shown for context. Interfaces and options vary by configuration.
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