Product Summary
The 1734-485ASC serial interface module bridges your DeviceNet master to RS-485 or RS-422 ASCII devices. This POINT I/O module uses shielded cables to cut electrical noise and supports configurable transmit and receive buffers of 20 bytes each. Its compact design fits directly onto a DIN rail for quick industrial deployment.
Installation Guide (Step-by-Step)
Mount the 1734-485ASC module onto a metal DIN rail. This rail connects to your system’s input-output interface ground. Ensure the shield of your cable grounds only at the DIN rail side. Never ground both cable ends because that creates a ground loop.
Wire either an RS-485 two‑wire network or an RS‑422 four‑wire network to the 1734‑TB terminal block. Follow the pin markings on the module case to connect the serial lines. Connect the second end of the cable to your ASCII device.
Apply a supply voltage between 10‑28.8V DC with a nominal of 24V DC. The module draws only 15mA at 24V. Turn on power to the module and the connected ASCII device.
Set the ASCII buffer sizes in your configuration software. Default values are 20 bytes for both receive and transmit buffers. Increase these values if your application needs longer strings. The I/O message size can also be modified to match your data requirements.
To send data from the DeviceNet master to the serial device, first transfer the character string to the ASCII module. The module stores the string internally until it reaches the defined buffer length or detects an end-of-string terminator. Then it transmits the data out the serial port.
Technical FAQ
1. What types of serial networks does the 1734‑485ASC support?
The module supports RS‑485 two‑wire and RS‑422 four‑wire networks. It cannot directly handle RS‑232 without an external converter.
2. How do I configure the buffer sizes?
Access the configuration file and adjust the “Transmit Character Buffer Length” and “Receive Character Buffer Length” parameters. The default is 20 bytes each.
3. Why must I ground only one side of the shield?
Grounding both ends forms a loop that injects electrical noise. The module’s removable terminal block lacks a chassis ground connection, so the shield must ground through the DIN rail.
4. Can I use this module with a non‑shielded cable?
Shielded cable is strongly recommended to reduce signal disruption. Unshielded cable will degrade network performance in noisy industrial environments.
Logistics & Standard Packaging Details
Each unit ships with one 1734-485ASC module, one 1734‑TB terminal block, and a printed installation guide. Express delivery is available via FedEx, UPS, and DHL. Order today for quick deployment.
