FS-8700-128 – Safetran SCS-128

FieldServer Driver


Safetran SCS-128



The Safetran-SCS-128 driver allows the transfer of data to and from devices over RS-232 SCS-128 protocol.  Vital Harmon Logic Controller (VHLC) supports SCS-128 protocol.  SCS-128 80938-098 Rev A04 is the basis of the Safetran-SCS 128 driver.  The FieldServer can be configured as a Client or Server.


Fieldserver Mode Nodes Comments
Client 1 Only 1 virtual client per port allowed on multidrop systems, which can poll 127 server devices
Server 127 This is a protocol limit, maximum devices can be polled by Client


Formal Driver Type


Client or Server


Compatibility Matrix

FieldServer Model Compatible with this driver
FS-x2010 Yes
FS-x2011 Yes
FS-x30 Yes
FS-x40 Yes


Connection Information

Connection type RS-232
Baud Rate* 300 ,600, 1200, 2400, 9600(Vendor limitation)FieldServer does not support baud 75 or 150.
Data Bits* 8 (Vendor limitation)
Stop Bits* 1 (Vendor limitation)
Parity* Even (Vendor limitation)
Multidrop Capability Yes


Devices tested

Device Tested (FACTORY, SITE)
Safetran-SCS Site


Connection configurations

The FieldServer is connected to the VHLC as shown in connection drawing.


Communications functions – Supported functions at a glance:

Data Types Supported

FieldServer Data Type Description (or Device Data Type)
Digital Input Indications
Digital Output Controls


Read Operations supported

FieldServer as a Client FieldServer as a Server
Read Binary Status via: Provide Binary Status for:
Poll Poll
Recall Recall
Indication Acknowledge Accept Indication Acknowledge


Write (Control) Operations supported

FieldServer as a Client FieldServer as a Server
Write Binary Commands: Accept Binary Commands:
Control Command Verify Control Command
Execute Execute Acknowledge and apply


Special Operations supported

FieldServer as a Client FieldServer as a Server
Transmit cutoff Transmit cutoff


Unsupported Functions and Data Types

Function Reason
Station testing functions These are modem testing and calibration functions, not required for FieldServer.
Change BaudDebugRecorders These functions are not implemented in the Protocol, however debugging and recording can be achieved using diagnostic tools from FieldServer.


Unsupported Devices or Protocol Options

Device Details
Devices operates on baud rate 75 or 150 FieldServer does not support these baud rates
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