The Contemporary Controls BASRTSX-B/P BASrouterSX is a high-performance BACnet multi-network router that provides stand-alone routing between BACnet/IP, BACnet Ethernet (ISO 8802-3), and BACnet MS/TP in any combination - including routing between two BACnet/IP networks across separate UDP ports for NAT traversal. The BASRTSX-B/P is the active replacement for the discontinued BASrouterLX line and the high-performance upgrade from the BASrouter (BASRT-B) family. Configuration is performed entirely through a resident HTTPS web server with SSL encryption. The BASRTSX-B/P is the panel-mount version in a metal enclosure with mounting flanges and screw holes for direct attachment to a flat panel - ideal for cabinets, plenums, equipment rooms, and retrofit projects where DIN-rail is not available - rated -40°C to +75°C and IP30. The functionally-identical BASRTSX-B mounts on standard 35-mm DIN-rail.
› HTTPS / SSL Encrypted Web Configuration
The BASRTSX-B/P resident web server uses HTTPS over SSL instead of unencrypted HTTP - login credentials and configuration changes are encrypted in transit. On first login, the user must configure an 8-63 character alphanumeric username and a strong password (alphanumeric plus optional ~!@#%^+[]{}_) before any other configuration is allowed. A Viewer-Only role provides read-only access. Custom SSL private keys and certificates can be uploaded for sites with specific certificate requirements.
› 50 BBMD + 147 FDR Capacity at Enterprise Scale
The BASRTSX-B/P as a BACnet/IP Broadcast Management Device (BBMD) supports up to 50 entries in the Broadcast Distribution Table and 147 Foreign Device Registrations - roughly 10x the legacy BASRT-B capacity. Appropriate for campus-wide BAS networks spanning many IP subnets and systems with many remote/foreign devices (handhelds, mobile commissioning laptops, third-party gateways) that need to register with a central BBMD.
› Built-In Wireshark MS/TP Capture (No Extra Hardware)
The BASRTSX-B/P continuously records the last ~32,000 MS/TP frames as a background task - both data frames and token passes. Click Generate MS/TP Wireshark File to convert the buffer to a .pcap file, then View MS/TP Traffic to download for analysis in Wireshark with full BACnet protocol decoding. No EIA-485 sniffer or specialized capture hardware required. Router date/time is appended to each capture for log correlation.
› MS/TP Status Map + Slave Proxy with Auto-Discovery
The BASRTSX-B/P provides a graphical MS/TP Device Status webpage displaying all 128 master MAC addresses (0-127) in a color-coded grid - green = online, blue = router MAC, gray = offline - with live network statistics. MS/TP Slave Proxy with optional Auto-Discovery allows the BASRTSX-B/P to act as a proxy for non-token-passing slave devices so they appear in BACnet device discovery sweeps from the IP side.
› BACnet Allowlist + Block Broadcasts (Security Hardening)
The BASRTSX-B/P can be locked down with the BACnet Allowlist to communicate only with explicitly listed BACnet/IP addresses - any unlisted IP is silently dropped. Block Broadcast I-Am to MS/TP Network prevents flooding small-memory MS/TP slaves; Block Full Range Who-Is to MS/TP Network hides MS/TP devices from broad BACnet discovery sweeps after they have been brought into the head-end.
› MS/TP Backbone + Backward Routing
For systems where two routers are connected via MS/TP and BACnet/IP devices on either side need to communicate transparently across that backbone, the BASRTSX-B/P supports an explicit MS/TP Backbone mode preventing messages from being dropped due to the smaller MS/TP Max APDU size. Backward Routing support improves interoperability with mixed-vintage BACnet equipment.
| BASRTSX-B/P Specifications | |
|---|---|
| Model / Manufacturer | BASRTSX-B/P - Contemporary Controls (BASrouterSX / BASautomation) |
| Mounting | Panel mount, metal enclosure with screw flanges |
| Networks Routed | BACnet/IP, BACnet Ethernet (ISO 8802-3), BACnet MS/TP in any combination; routes between two BACnet/IP networks across separate UDP ports |
| BACnet Profile | BACnet Router (B-RTR) and BACnet Broadcast Management Device (B-BBMD), Annex A PIC Statement, BACnet Protocol Revision 15 |
| BIBBs Supported | DS-RP-B, DS-RPM-B, DM-DDB-B, DM-DOB-B, NM-RC-B, NM-BBMDC-B |
| BBMD / FDR Capacity | 50 entries in Broadcast Distribution Table (BDT); 147 Foreign Device Registrations |
| Security | HTTPS / SSL web config (uploadable private key + cert); BACnet Allowlist (per-entry IP filter); user-configured 8-63 char credentials on first login |
| MS/TP Slave Proxy | Manual entry plus optional Auto-Discovery (up to 100 manual entries) |
| Wireshark Capture | Built-in rolling buffer of approximately 32,000 most recent MS/TP frames; on-demand .pcap export |
| Ethernet Port | Shielded RJ-45, 10/100 Mbps, IEEE 802.3, Auto-Negotiation, Auto-MDIX, 100 m max CAT5 |
| MS/TP Connector | 5-pin removable terminal block (+, -, SC, COM, SH); optically-isolated EIA-485 |
| MS/TP Standard | ANSI/ASHRAE 135 (ISO 16484-5) |
| MS/TP Baud Rates | 9600, 19200, 38400, 57600, 76800, 115200 bps (selectable; default 38400) |
| MS/TP Cable Length | 1200 m max (1000 m at 115.2 kbps) |
| MS/TP Devices | Up to 31 full-load (or 62 half-load) per segment, 254 total addresses |
| Bias & Termination | Switchable internal 120 ohm termination + 200 mV fail-safe bias on front-panel 2-pin DIP switch |
| Protocol Hardening | MS/TP Backbone, Backward Routing, Block Broadcast I-Am, Block Full Range Who-Is - all enable/disable |
| NAT Traversal | Yes - dual BACnet/IP UDP ports + Public IP Address configuration |
| Factory Defaults | IP 192.168.92.68 / 24, Gateway 192.168.92.1, BACnet/IP UDP BAC0 (47808), BACnet/IP Network 1, MS/TP Network 2001, MS/TP MAC 0, Max Masters 127, Max Info Frames 100, Tolerance Lenient |
| Real-Time Clock | Supercapacitor-backed RTC (~1 week hold); timestamps Wireshark captures |
| Configuration / Firmware | Web-based config upload/download; web-based firmware upload (do not modify firmware filename) |
| Power Input | 24 VAC ±10% 6 VA 47-63 Hz, or 24 VDC ±10% 3 W (Class 2 only); reverse-polarity protected; HIB pin for redundant input |
| Power Sharing | Half-wave rectified - share 24 VAC only with other half-wave devices, never with full-wave |
| LEDs | STAT, PWR, Ethernet S (speed) + L (link/activity), EIA-485 Tx + Rx |
| Reset | Front-panel Reset IP button (10-second hold restores factory IP, key, certificate, login) |
| Operating Temp | -40°C to +75°C; storage -40°C to +85°C; humidity 10-95% non-condensing; IP30 |
| Dimensions | 151.6 mm × 96.4 mm × 47.2 mm (5.97 in × 3.79 in × 1.86 in); mounting hole spacing 130.7 mm × 78.97 mm |
| Enclosure | Metal case, panel-mount with screw flanges |
| Compliance | UL 61010 Listed, c-UL Listed (CSA C22.2 No. 142-M1987); CE Mark; CFR 47 Part 15 Class A; RoHS; KC (RRA Article 58-2, Korea) |
| Warranty | 5-year manufacturer warranty |
BASRTSX-B/P Product Documentation
BASrouterSX Data Sheet (DS-BASRTSX0) BASrouterSX Installation Guide BASrouter Application Guide (11 Routing Examples) Successful BASrouter Installation & Operation Troubleshooting BACnet Networks (Status Screen Tech Note)BASRTSX-B/P - Frequently Asked Questions
What is the difference between the BASRTSX-B/P (Panel-Mount) and the BASRTSX-B (DIN-Rail)?
The BASRTSX-B/P and BASRTSX-B are functionally identical - same firmware, same routing capability, same HTTPS web interface, same BBMD/FDR/Allowlist/Wireshark/Slave-Proxy features, same hardware electronics, same warranty. The only difference is mounting style: the BASRTSX-B mounts on standard 35-mm DIN-rail (TS-35); the BASRTSX-B/P uses a panel-mount metal enclosure with mounting flanges and screw holes for attachment to a flat panel. Choose based on which mounting method fits the installation.
What is the difference between the BASrouterSX (BASRTSX-B/P) and the legacy BASrouter (BASRT-B)?
The BASRTSX-B/P is the high-performance upgrade from the BASRT-B. Key differences: HTTPS / SSL encrypted web configuration (vs unencrypted HTTP); 50 BBMD + 147 FDR entries (vs 5/5 on the BASRT-B); built-in MS/TP Wireshark capture with ~32,000-frame rolling buffer (no specialty hardware); MS/TP Slave Proxy with auto-discovery; BACnet Allowlist for IP-level traffic restriction; MS/TP Backbone and Backward Routing; externally-accessible DIP switches for bias/termination; 115.2 kbps max baud rate; user-configured login credentials on first use.
Is the BASRTSX-B/P the replacement for the discontinued BASrouterLX?
Yes. The BASrouterSX product line is the active replacement for the discontinued BASrouterLX (BASRTLX-B and BASRTLX-B/P). The BASrouterSX adds HTTPS / SSL encrypted web configuration, the BACnet Allowlist security feature, externally-accessible bias/termination DIP switches, and other enhancements over the legacy LX. The BASrouterSX-GSA model (BASRTSX-B-GSA) is also available for U.S. government building installations requiring GSA compliance.
How does the built-in Wireshark MS/TP capture work on the BASRTSX-B/P?
The BASRTSX-B/P continuously records the last ~32,000 MS/TP frames in a rolling buffer (data frames + token passes). From Status -> MS/TP Traffic, click Generate MS/TP Wireshark File to convert the buffer to a .pcap file, then View MS/TP Traffic to download to your PC. Open in Wireshark with built-in BACnet decoding - frame contents, source/destination MAC, frame type, and CRC validity are all visible. Router date/time is appended to each capture for log correlation.
How do I do initial setup of a new BASRTSX-B/P?
Connect the BASRTSX-B/P to a Windows PC with an Ethernet cable, set the PC IP and subnet to match the router default (e.g. PC at 192.168.92.5 / 24, router at 192.168.92.68 / 24). Browse to https://192.168.92.68 (accept the self-signed certificate warning). On first login, configure an 8-63 character alphanumeric username and a strong password (at least one letter and one number) before any other configuration. Then set Device Name, Device Instance, IP, BACnet/IP Network, MS/TP Network/MAC/Baud, and save & reboot.
What if I lose access to the BASRTSX-B/P (forgotten password, certificate problem, wrong IP)?
Press and hold the front-panel Reset IP button (located underneath the Power LED) using a paper clip for at least 10 seconds until the status light turns off, then release. After about 30 seconds the unit returns at the factory default IP 192.168.92.68 / 24 with factory key, certificate, and login. The Username and Password must be reconfigured on first login. Do not remove power during reset.
Can the BASRTSX-B/P share 24 VAC power with other devices?
Only with other half-wave rectified devices. The BASRTSX-B/P is half-wave rectified; sharing 24 VAC with full-wave rectified devices can cause damage. Sharing a common 24 VDC source is fine. The HIB pin accepts an optional backup 24 VAC/VDC source for redundant power. Input is reverse-polarity protected. Power draw is 6 VA at 24 VAC or 3 W at 24 VDC. Use 16-18 AWG conductors.
Where do I set bias and termination on the BASRTSX-B/P MS/TP bus?
The BASRTSX-B/P provides switchable internal 120-ohm termination and 200 mV fail-safe bias on a front-panel 2-pin DIP switch. If the BASRTSX-B/P is at the end of the MS/TP bus, set both DIP switch positions to ON. If in the middle of the bus, set both to OFF. Both positions should always match - never one ON and one OFF. For long segments or 115.2 kbps baud rate, termination at both bus ends is critical.
Your BASRTSX-B/P BASrouterSX is backed by Contemporary Controls' five-year manufacturer warranty against defects in materials and workmanship from the original ship date. The BASRTSX-B/P is BACnet conformant per the published Annex A PIC Statement (B-RTR and B-BBMD profiles, BACnet Protocol Revision 15), UL 61010 Listed and c-UL Listed (CSA C22.2 No. 142-M1987), CE marked, FCC Part 15 Class A, RoHS compliant, and KC registered (RRA Article 58-2, Korea).
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