B&B Electronics 485DSS manual Ack

Example: A unit with a decimal address of ten will have a delay of 220 milliseconds [(10 x 0.02) + 0.02 = 0.22 seconds].

Command character: ACK (decimal 6)

Example 1: To request status from the 485DSS set to address 11 ( 0B hex) decimal.

HOST transmits: Xoff	“0”	“B”	ACK
( 19	48	66	6 decimal)
( 13	30	42	6 hex)

Reply: “A” “0” “B” “0” “1” cr

The reply indicates that the RS-232 port has no connection to the network on unit 11 and the CTS handshake line is in the high state.

Example 2: Request status from all the 485DSS's on the network.

HOST transmits: Xoff	DC2	DC2	ACK
( 19	18	18	6 decimal)
( 13	12	12	6 hex)

Reply: “A” “0” “1” “0” “0” cr

Reply: “A” “0” “2” “1” “0” cr

Reply: “A” “0” “3” “0” “0” cr

Reply: “A” “1” “1” “0” “1” cr The reply indicates the following:

Unit 1 waited 40 milliseconds and then sent a reply indicating no connection of the RS-232 port to the network and the CTS handshake line is in the low state.

Unit 2 waited 60 milliseconds and then sent a reply indicating connection of the RS-232 port to the network and the CTS handshake line is in the low state.

Unit 3 waited 80 milliseconds and then sent a reply indicating no connection of the RS-232 port to the network and the CTS handshake line is in the low state.

485DSS-0308 Manual 13

B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104 B&B Electronics – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph +353 91 792444 – Fax +353 91 792445