Description
Honeywell 627-1003
Technical Specifications
- Compatible port: 621 rack dedicated programming port
- External interface: DB25 female serial port
- Fixed communication baud rate: 9600 bps
- Supply power: Drawn directly from the rack programming port, no external power required
- Operating temperature: 0 °C to +60 °C
- Compatible devices: 627 series handheld programmer, RS232-enabled configuration PC
Functional Features Serial level conversion, translates programming device RS232 signals to backplane programming bus logic levels. On-board ESD protection, diverts static charge generated during programming device connection, protects the CPU programming port. Plug-and-play operation, no additional configuration or driver required. On-board status LED illuminates when programming link is active. Compact form factor, mounts directly to the rack programming port.
Application Scenarios 621 system user program upload and download Online variable monitoring and forced debugging Field backup of existing PLC programs Level-matching connection between handheld programmer and rack backplane
Performance Parameters
- Communication latency: ≤1 ms
- ESD protection: ±8 kV contact discharge
- Data bit error rate: ≤10^-9
- Isolation withstand voltage: 500 VAC
Material Composition FR4 PCB substrate RS232 level translation chip ESD protection diodes Gold-plated DB25 connector Gold-plated backplane mating plug ABS flame retardant plastic enclosure
Structural Features Small rectangular block form factor, plugs directly into the rack programming port. Side-facing DB25 female port connects to programming device serial cable. Front panel status LED indicates active programming link. Full plastic enclosure covers internal circuitry, prevents accidental short circuit against adjacent components.
Working Principle RS232 serial signals from the programming device pass through the level translation chip, converted to TTL-level signals compatible with the backplane programming bus, then transmitted to the CPU module. Debug and monitor data returned from the CPU passes through the level translation chip again, converted back to RS232 signals for transmission to the programming device. ESD protection components divert static charge generated during cable plug-in, preventing electrostatic damage to the CPU programming port.
Installation Requirements Insert the adapter into the rack programming port only when rack power is off. Use original 627 series programming cable for DB25 connection. Route serial cable separately from high-voltage power cable bundles. Verify the link status LED illuminates after power-up, confirming normal communication.
Usage Notes Never hot-swap the adapter, this causes programming port communication error. Oxidized DB25 pins cause intermittent communication loss; clean contacts regularly. This adapter does not support direct USB-to-serial device connection, use only original programming hardware. Replace the entire adapter on internal circuit failure, no field component-level repair supported.
