FS-8700-66 - GE-SNP Protocol Serial Driver

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Driver Code:

SNP

Version:

1.00a

Protocol Version:

N/A

Document Rev:

Interface:

RS232 or RS-485 (Half-Duplex)

Baud Rates:

Std Baud Rates up to 19200 (GE PLC limitation)

Data Bits:

7,8

Stop Bits:

1,2

Parity:

Odd, Even, None

Handshaking:

None

Devices Supported:

Device	Tested
	Protocol has been tested against a Series 90-30 CPU 364 Protocol has been tested against an Intellution FIX32's SNP device driver.

Driver Details

The SNP driver is capable of acting as a client or server.
The SNP driver can read and write system memory and change privilege levels of a SNP device.
The FieldServer's serial and/or RS485 ports may be used to communicate with the SNP device.
The SNP driver supports the Mailbox communication method of the SNP protocol. The Datagram method is unsupported.
The SNP driver can expose its communication statistics so that they can be monitored by a downstream device.
The following data types may be read.
- Discrete Inputs (%I)
- Discrete Outputs (%Q)
- Discrete Temporaries (%T)
- Discrete Internals (%M)
- Genius Global Data (%G)
- Analog Inputs (%AI)
- Analog Outputs (%AQ)
- Registers (%R)
- %SA Discrete
- %SB Discrete
- %SC Discrete
- %S Discrete (%S)
Up to 4096 bytes of data can be handled in a single transaction.