CM520-57 Series — Five-port industrial cellular gateway
Supplied filename CM520-57FB series | body covers 57F/57FS/57FB/57FBS · Technical review edition · PDF
CAIMORECM520-57FB / 57FBS
Dual-SIM industrial cellular router series
A five-port, dual-SIM industrial router family. The CM520-57FB is listed as a 4G configuration and the CM520-57FBS as a 5G configuration, with serial integration and a wide DC input range.
- 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
Product photography. Open full image ↗
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 |
CM520-57FB: 4G. CM520-57FBS: 5G. The key specifications and photograph shown here describe the FB listing. Use the second official reference for the FBS variant and specify the modem, regional bands and optional interfaces when ordering.
Model selection
CM520-57 Series — Five-port industrial cellular gateway · Supplied filename CM520-57FB series | body covers 57F/57FS/57FB/57FBS · Source p. 1
| CM520-57F | Cellular: 4G; SIM slots: 1; RS232: Yes; RS485: Optional |
|---|---|
| CM520-57FS | Cellular: 5G; SIM slots: 1; RS232: Yes; RS485: Optional |
| CM520-57FB | Cellular: 4G; SIM slots: 2; RS232: Yes; RS485: Optional |
| CM520-57FBS | Cellular: 5G; SIM slots: 2; RS232: Yes; RS485: Optional |
Industrial platform and protection
CM520-57 Series — Five-port industrial cellular gateway · Supplied filename CM520-57FB series | body covers 57F/57FS/57FB/57FBS · 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 | 6-32 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 16 MB, expandable to 32 MB; SDRAM 128 MB. 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
CM520-57 Series — Five-port industrial cellular gateway · Supplied filename CM520-57FB series | body covers 57F/57FS/57FB/57FBS · Source pp. 4, 6
| 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 / Wi-Fi antennas | Standard SMA female, 50 ohm; cellular extension leads optionally 3/5/10/15 m. |
| 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. |
Network connectivity and IP functions
CM520-57 Series — Five-port industrial cellular gateway · Supplied filename CM520-57FB series | body covers 57F/57FS/57FB/57FBS · 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
CM520-57 Series — Five-port industrial cellular gateway · Supplied filename CM520-57FB series | body covers 57F/57FS/57FB/57FBS · 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
CM520-57 Series — Five-port industrial cellular gateway · Supplied filename CM520-57FB series | body covers 57F/57FS/57FB/57FBS · 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
CM520-57 Series — Five-port industrial cellular gateway · Supplied filename CM520-57FB series | body covers 57F/57FS/57FB/57FBS · 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. |
Wi-Fi
CM520-57 Series — Five-port industrial cellular gateway · Supplied filename CM520-57FB series | body covers 57F/57FS/57FB/57FBS · Source pp. 7-8
| Module | Integrated chipset Wi-Fi module. |
|---|---|
| Standards / rates | 802.11 b/g/n; 6/9/12/18/24/36/48/54 Mbps; maximum stated 300 Mbps. |
| Encryption | WEP, WPA and WPA2; hardware security engines listed as 802.11i 4.0, TKIP, AES and CCMP. |
| Modes | AP and repeater. |
| Coverage claim | Up to 150 m outdoors without obstructions; conditions not specified. Confirmation required. |
Hardware
CM520-57 Series — Five-port industrial cellular gateway · Supplied filename CM520-57FB series | body covers 57F/57FS/57FB/57FBS · Source pp. 8-9
| CPU | 650 MHz embedded industrial CPU with MMU |
|---|---|
| Flash / SDRAM | 16 MB / 128 MB, described as expandable. |
Power and environment
CM520-57 Series — Five-port industrial cellular gateway · Supplied filename CM520-57FB series | body covers 57F/57FS/57FB/57FBS · Source pp. 8-9
| Input | 6-32 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
CM520-57 Series — Five-port industrial cellular gateway · Supplied filename CM520-57FB series | body covers 57F/57FS/57FB/57FBS · 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
CM520-57 Series — Five-port industrial cellular gateway · Supplied filename CM520-57FB series | body covers 57F/57FS/57FB/57FBS · 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
CM520-57 Series — Five-port industrial cellular gateway · Supplied filename CM520-57FB series | body covers 57F/57FS/57FB/57FBS · 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
CM520-57 Series — Five-port industrial cellular gateway · Supplied filename CM520-57FB series | body covers 57F/57FS/57FB/57FBS · 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 CM520-57FB / 57FBS fits into your installation.
Illustrative connection architecture. External equipment and customer software are shown for context. Interfaces and options vary by configuration.
Downloads
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CM520-57 — Wireless router user manual
Source revision V1.3 | 18 July 2022 · Technical review edition · PDF