CM520-56X V4.0 — Two-port industrial cellular gateway
Source filename V4.0 | 22 May 2026 · Technical review edition · PDF
CAIMORECM520-56
Two-port industrial cellular gateway
A two-port industrial cellular gateway. Ethernet interfaces can operate as two LAN ports or one WAN plus one LAN port, with RS232 and an optional RS485 configuration.
- Ethernet
- 2 × 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 | 2 × 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
CM520-56X V4.0 — Two-port industrial cellular gateway · Source filename V4.0 | 22 May 2026 · Source pp. 1-2
| CM520-56F | cellular: 2G/3G/4G; Modem: 1 x 4G; SIM slots: 1 |
|---|---|
| CM520-56FS-GC | cellular: 2G/3G/4G/5G; Modem: 1 x 5G; SIM slots: 1 |
| CM520-56FB | cellular: 2G/3G/4G; Modem: 1 x 4G; SIM slots: 2 |
| CM520-56FBS-GC | cellular: 2G/3G/4G/5G; Modem: 1 x 5G; SIM slots: 2 |
Shared interface selection
CM520-56X V4.0 — Two-port industrial cellular gateway · Source filename V4.0 | 22 May 2026 · Source pp. 1-2
| Interfaces | Ethernet and terminal block; RS232; optional RS485. |
|---|---|
| Variant scope | 4G/5G and one/two SIM slots depend on the model row. All listed models use one cellular module; dual SIM does not establish two concurrent modem links. |
External interfaces
CM520-56X V4.0 — Two-port industrial cellular gateway · Source filename V4.0 | 22 May 2026 · Source pp. 4, 7-8
| Ethernet | 2 x 10/100 Mbps Base-T; IEEE 802-3 / 802-2 as printed; 1.5 kV isolation. |
|---|---|
| WAN / LAN | Default two LAN ports; configurable as one WAN plus one LAN, or two LAN ports. WAN is switchable to LAN. These are two physical ports, not three. |
| Serial | 1 RS232, 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. |
| Cellular antenna | SMA female, 50 ohm; optional 3/5/10/15 m leads. |
| Positioning, optional | GPS and BeiDou. |
| SIM/UIM | Full-size push-type card interface, 1.8/3/5 V, 15 kV ESD protection; slot count depends on model. |
| Power | Standard round power socket. |
| Indicators | POWER, ONLINE and WIFI. |
| RESET | Restore factory defaults. |
| Wi-Fi source contradiction | The Wi-Fi antenna row lists SMA female, 50 ohm, but explicitly states THIS SERIES DOES NOT SUPPORT WI-FI. The later generic Wi-Fi table is retained as conflicting source information, not verified device capability. |
| RTC | Source says built-in real-time-clock circuit, followed by NOT SUPPORTED. Do not advertise RTC as supported. |
Network connectivity and IP functions
CM520-56X V4.0 — Two-port industrial cellular gateway · Source filename V4.0 | 22 May 2026 · Source pp. 5-7
| 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
CM520-56X V4.0 — Two-port industrial cellular gateway · Source filename V4.0 | 22 May 2026 · Source pp. 5-7
| Firewall | Stateful packet inspection (SPI), denial-of-service (DoS) protection, multicast/Ping filtering and access-control lists (ACL). IP/MAC combined access authentication. |
|---|---|
| Address translation | NAT, PAT, DMZ, port mapping and virtual servers. |
| Users / AAA | User privilege levels; local authentication, RADIUS, TACACS+ and LDAP. |
| Data security | CA support, including automatic application; SM1/SM2/SM3/SM4 algorithms. |
| 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
CM520-56X V4.0 — Two-port industrial cellular gateway · Source filename V4.0 | 22 May 2026 · Source pp. 5-7
| 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; AWS, Tencent Cloud, power-industry platforms, Alibaba Cloud; central and batch management. |
| Industrial protocols, optional | Modbus TCP, Modbus RTU, EtherNet/IP and Modbus TCP Slave. |
Additional software-table entries
CM520-56X V4.0 — Two-port industrial cellular gateway · Source filename V4.0 | 22 May 2026 · Source pp. 5-7
| Optional WLAN | IEEE 802.11ac/a/b/g/n; open-system/shared-key/WPA/WPA2 authentication; WEP/TKIP/AES encryption. Detailed Wi-Fi table lists only b/g/n: Confirmation required. |
|---|---|
| WLAN modes | AP and Client; detailed table also lists repeater. |
| DM / diagnostics | Centralized management and batch configuration; Ping, traceroute and Sniffer packet capture. |
Security and reliability additions
CM520-56X V4.0 — Two-port industrial cellular gateway · Source filename V4.0 | 22 May 2026 · Source pp. 5-7
| Data security | CA support, including automatic application ; SM1/SM2/SM3/SM4 cryptographic algorithms. |
|---|---|
| VPN | IPsec, L2TP, PPTP, GRE, N2N, L2TP over IPsec, GRE over IPsec, EOIP and OpenVPN. |
| Hardware encryption | State Grid, China Southern Power Grid and Chinese commercial-cryptography encryption support, . Exact algorithms, modules and approvals require confirmation. |
| Bandwidth aggregation | Two-SIM and three-SIM bandwidth aggregation are claimed in the software table. Hardware and service prerequisites are unspecified; this is not inferred from a single-modem dual-SIM selection row. Confirmation required. |
| Link health | Online maintenance, heartbeat detection and automatic reconnection. |
| Management | SNMP. |
| DHCP / translation | DHCP server/client; SNAT/DNAT port mapping; DMZ. |
Communication, Wi-Fi and access functions
CM520-56X V4.0 — Two-port industrial cellular gateway · Source filename V4.0 | 22 May 2026 · Source pp. 5-7
| Transport | 5G/4G/3G; Ethernet-to-cellular; Ethernet-to-Wi-Fi; serial/RS485-to-cellular, Wi-Fi and Ethernet. |
|---|---|
| Transparent services | DTU and MQTT transparent transfer; APN/VPDN; VXLAN. |
| Link backup | Wired/cellular mutual backup; Wi-Fi/cellular primary/backup. |
| Health checks | Online maintenance and DTU LAN-client heartbeat packets. |
| Radio restrictions | Cellular frequency locking and SIM locking, as named in source. |
| Wi-Fi access | Client-count limits and client isolation. |
| Multiple SSIDs | Up to four Wi-Fi names, each with an independent MAC address. |
| Identity / controls | MAC and serial-number persistence; access restrictions; port alarms. |
| Positioning | BeiDou-only, GPS-only or combined GPS/BeiDou, optional. |
Optional customized and platform functions
CM520-56X V4.0 — Two-port industrial cellular gateway · Source filename V4.0 | 22 May 2026 · Source pp. 5-7
| Three-link backup | Wired, Wi-Fi and cellular links as mutual primary/backup. |
|---|---|
| IP traffic splitting | Distribute flows by source/destination IP across network links, servers or paths to reduce congestion and improve utilization/stability. |
| Wi-Fi diagnostics | Client signal-strength monitoring. |
| Session records | Online/offline timestamps for wired, cellular and Wi-Fi users. |
| TF security | Software encryption for TF cards. Physical TF-slot availability depends on hardware. |
| Product customization | Customer-customized product log and model identifier, as written; whether log means logo Confirmation required. |
| Central platform | Remote parameters, OTA, remote multimedia updates (music/video/advertising), allow/block lists, traffic and online statistics, radio-system statistics, SMS/WeChat/Wi-Fi authentication, traffic and speed controls, time limits, Internet-behavior controls, Wi-Fi probe and multi-level user management. Backend/platform scope requires configuration review. |
Optional development and industrial protocols
CM520-56X V4.0 — Two-port industrial cellular gateway · Source filename V4.0 | 22 May 2026 · Source pp. 5-7
| Development / clouds | Python custom development; Amazon AWS, Alibaba Cloud, Tencent Cloud and power-industry platforms. |
|---|---|
| Industrial protocols | Modbus TCP; Modbus TCP/RTU conversion; Modbus RTU; EtherNet/IP; Modbus TCP Slave; MQTT; Ntrip Client and Ntrip Server. |
| Power-industry protocols | 101/104, 645, 61850 and TR-069, as written; no unspecified editions or conformity inferred. |
| Environmental protocol | HJ212-2005/2017. |
Cellular parameters
CM520-56X V4.0 — Two-port industrial cellular gateway · Source filename V4.0 | 22 May 2026 · Source pp. 8-9
| 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. |
| Power private network | 1.8 GHz power-industry private-network bands and integrated public/private modules. |
| Overseas options | The source claims broad international coverage; specify country and required bands so an appropriate optional modem can be selected. No universal band or certification claim is inferred. |
Conflicting generic Wi-Fi table - applicability Confirmation required
CM520-56X V4.0 — Two-port industrial cellular gateway · Source filename V4.0 | 22 May 2026 · Source pp. 8-9
| Module | Integrated chipset Wi-Fi module. |
|---|---|
| Standards / rates | Source lists 802.11 a/b/g/n, rates 6/9/12/18/24/36/48/54 Mbps and maximum 300 Mbps. This table conflicts with the explicit statement that this series has no Wi-Fi. |
| Encryption | WEP, WPA and WPA2; hardware security engines listed as 802.11i 4.0, TKIP, AES and CCMP. |
| Modes | AP and repeater. |
| Coverage claim | Source claims up to 150 m outdoors without obstructions. Not verified device capability because the hardware table says no Wi-Fi. |
Hardware
CM520-56X V4.0 — Two-port industrial cellular gateway · Source filename V4.0 | 22 May 2026 · Source pp. 9-11
| CPU | 680 MHz in hardware table; 650 MHz in industrial-design list. Both are retained: Confirmation required. |
|---|---|
| Flash | 128 Mbit, expandable; reliability section states up to 256 Mbit. |
| SDRAM | 1 Gbit, described as expandable. |
Power
CM520-56X V4.0 — Two-port industrial cellular gateway · Source filename V4.0 | 22 May 2026 · Source pp. 9-11
| DC input | Standard 7-32 V DC; optional 7-60 V DC. Reverse-polarity, overvoltage and overcurrent protection. Design section instead lists 6-32 V. Confirm the exact supplied variant before applying voltage. |
|---|---|
| Standard supply | 9 V DC / 1.33 A; model-dependent, subject to actual shipment. |
| Communication current | Average 390 mA at 9 V DC; network-registration peak 1.0 A at +9 V DC. |
| Standby | Average <200 mA at +9 V DC. |
Environment and mechanics
CM520-56X V4.0 — Two-port industrial cellular gateway · Source filename V4.0 | 22 May 2026 · Source pp. 9-11
| Operating temperature | -35 to +75 °C |
|---|---|
| Extended operation | -40 to +80 °C |
| Storage | -40 to +85 °C |
| Humidity | 95%, non-condensing. |
| Enclosure | Metal; shielding, isolated enclosure/system, lightning-protection design and IP30. |
| Body | 92.6 x 91.4 x 24.4 mm, excluding antennas and mounting hardware. |
| Package | 350 x 215 x 88 mm |
| Weight | 0.271 kg, excluding antennas and mounting hardware. |
| Shock / vibration / drop | IEC 60068-2-27 / IEC 60068-2-6 / IEC 60068-2-32 |
EMC parameters
CM520-56X V4.0 — Two-port industrial cellular gateway · Source filename V4.0 | 22 May 2026 · Source pp. 9-11
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. |
certificates
CM520-56X V4.0 — Two-port industrial cellular gateway · Source filename V4.0 | 22 May 2026 · Source pp. 9-11
Certification scope and test conditions depend on the selected model. Request the applicable documentation.
| Domestic | Ministry of Public Security certificate; MIIT network-access permit; CRCC; Ministry of Housing and Urban-Rural Development interoperability certificate; CCC; radio-committee certificate; EMC; high/low-temperature testing. |
|---|---|
| International | CE, FCC, E-mark, CB, RoHS and Japan TELEC. |
| Scope | Certificate identifiers, current validity and exact model/module scope Confirmation required. |
System connectivity
From field equipment to your system.
See how CM520-56 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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