CM520-81 Series — Single-port industrial wireless router
Source filename revision v3.1; page heading CM520-81F · Technical review edition · PDF
CAIMORECM520-81
Single-port industrial cellular router
A single-port industrial cellular router with a serial interface. The manufacturer lists RS232 or RS485 configurations, with RS422/TTL support available according to the selected configuration.
- Ethernet
- 1 × 10/100 Mbps Ethernet port
- Serial options
- RS232 or RS485; RS422 / TTL configurations also listed
- DC input
- 6–32 V DC
- Operating temperature
- −25 to +65 °C; extended version listed separately
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Technical specifications
Options vary by model, hardware revision and firmware.
Key specifications
| Ethernet | 1 × 10/100 Mbps Ethernet port |
|---|---|
| Serial options | RS232 or RS485; RS422 / TTL configurations also listed |
| DC input | 6–32 V DC |
| Operating temperature | −25 to +65 °C; extended version listed separately |
Network connectivity and IP functions
CM520-81 Series — Single-port industrial wireless router · Source filename revision v3.1; page heading CM520-81F · Source pp. 4-6
| 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
CM520-81 Series — Single-port industrial wireless router · Source filename revision v3.1; page heading CM520-81F · Source pp. 4-6
| 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
CM520-81 Series — Single-port industrial wireless router · Source filename revision v3.1; page heading CM520-81F · Source pp. 4-6
| 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
CM520-81 Series — Single-port industrial wireless router · Source filename revision v3.1; page heading CM520-81F · Source pp. 6-7
| Wireless module | Industrial-grade module. |
|---|---|
| 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 | LTE/UMTS/HSPA+/HSDPA/HSUPA/WCDMA/EDGE/GSM |
| 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. |
Wi-Fi parameters
CM520-81 Series — Single-port industrial wireless router · Source filename revision v3.1; page heading CM520-81F · Source pp. 6-7
| Module | Integrated chipset Wi-Fi module, described as highly integrated and stable. |
|---|---|
| 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; source lists 802.11i 4.0, TKIP, AES and CCMP hardware security engines. |
| Modes | AP and repeater. |
| Coverage claim | Up to 150 m outdoors without obstructions; conditions are not specified. Confirmation required. |
Hardware
CM520-81 Series — Single-port industrial wireless router · Source filename revision v3.1; page heading CM520-81F · Source pp. 7-8
| CPU | Industrial embedded processor, 533 MHz; MMU. |
|---|---|
| Flash | 128 Mbit, expandable to 256 Mbit. |
| SDRAM | 1 Gbit. |
Power
CM520-81 Series — Single-port industrial wireless router · Source filename revision v3.1; page heading CM520-81F · Source pp. 7-8
| DC input | 6-32 V, with reverse-polarity, overvoltage and overcurrent protection. Design section instead says 5-35 V. |
|---|---|
| Standard supply | 9 V DC / 1.5 A |
| Communication current | Average 390 mA at +9 V DC; registration peak 1.0 A at +9 V DC. |
| Standby | Average <56 mA at +9 V DC. |
Environment and mechanics
CM520-81 Series — Single-port industrial wireless router · Source filename revision v3.1; page heading CM520-81F · Source pp. 7-8
| 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; IP30 here, conflicting with IP41 in reliability text. |
| Body | 174 x 131 x 27 mm, excluding antennas and mounting hardware; drawing differs. Confirmation required. |
| Package | 350 x 215 x 88 mm |
| Weight | 0.7 kg |
| Shock / vibration / drop | IEC 60068-2-27 / IEC 60068-2-6 / IEC 60068-2-32 |
EMC parameters
CM520-81 Series — Single-port industrial wireless router · Source filename revision v3.1; page heading CM520-81F · Source pp. 7-8
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. |
product certifications
CM520-81 Series — Single-port industrial wireless router · Source filename revision v3.1; page heading CM520-81F · Source pp. 7-8
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. |
| Verification | These are translated source claims. Certificate identifiers, current validity and exact model scope Confirmation required. |
System connectivity
From field equipment to your system.
See how CM520-81 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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