FS8700-87 – B&B Electronics Digital I/O Module

Driver Version: 1.03

Document Revision: 6

FieldServer Driver – Serial


B&B Electronics Digital I/O Module 485SDD16



The FieldServer SDD16 driver is used to communicate with a digital I/O module model 485SDD16.  The current driver only supports reading the status of all sixteen digital input lines.  The SDD16 driver in conjunction with the 485SDD16 module allows the FieldServer to sense external On/Off conditions and to control a variety of devices.

The SDD16 driver makes use of the data complement mode feature of the 485SDD16 module. In data complement mode the driver and module communicates with double the amount of data bytes to enable better error detection in noisy electrical environments.

The driver is only available as a client.  Server drivers are for FieldServer testing purposes only.


Formal Driver Type




Connection Information

Connection type: RS-485 (Two wire, Half-Duplex)
Baud Rates: 1200; 2400; 4800; 9600
Data Bits: 8
Stop Bits: 1
Parity: None
Multidrop Capability: Yes


Devices tested:

Device Tested
485SDD16 Factory


Connection configurations

Communications functions – Supported functions at a glance:

Data Types Supported

FieldServer Data Type Description (or Device Data Type)
Digital Input Digital Input Line


Read Operations supported

FieldServer as a Client
Read Binary Status:
Read the binary state of all digital input lines


Unsupported Functions and Data Types

Function Reason
Read Digital Outputs In development
Set Digital Outputs In development
Program I/O lines direction as Input or Output In development
Program Turnaround Delay In development
Program Digital Output Lines’ Powerup States In development



Limitation Reason
Only one 485SDD16 module on a RS-485 line may be used The addition of extra devices up to 256 devices are in development


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