B&B Electronics 485DSS - Manual (Page 16)

12 485DSS-0308 Manual
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
response from an individual 485DSS. Placing broadcast characters
in the address field specifies all 485DSS's on the network. This
command temporarily turns off (disconnect) the RS-232 port from
the network while transmitting the reply message.
The reply message transmitted by the 485DSS consists of six
ASCII characters. The first character is the acknowledge character,
an upper case "A" (decimal 65). The second and third characters
represent the hexadecimal address of the 485DSS that sent the
message. The address range is from 0 to 255 (HEX "00" to "FF").
The fourth character indicates the select state of 485DSS, a "0"
(decimal 48) indicates the RS-232 port does not have a connection
(not selected) to the network and a "1" (decimal 49) indicates the
RS-232 port has a connection (selected) to the network. The fifth
character indicates the state of the CTS handshake input line on pin
5 of the RS-232 port connector. A "0" (decimal 48) indicates a low
state on the CTS input pin, and a "1" (decimal 49) indicates a high
state on the CTS input pin. The sixth character is the end of
message character, a carriage return (decimal 13).
When this command contains a specific address, the 485DSS
whose address matches the command address will wait for twenty
milliseconds before transmitting the reply message. If the command
uses the broadcast characters to receive status from all 485DSS's
on the network each 485DSS will delay transmitting its reply based
on its address. The amount of delay is equal to the unit's address in
decimal multiplied by twenty milliseconds then add an additional 20
milliseconds.
Reply Syntax: A ___ ___ ___ ___ cr
| | | | | |
| | | | | End of message char.
| | | | Handshake input state.
| | | Select State.
| | Least signf. address character.
| Most signf. address character.
Start of message character.