485SDD16-1005 Manual 13
B&B Electronics -- 707 Dayton Road -- Ottawa, IL 61350
PH (815) 433-5100 -- FAX (815) 433-5104
Set Module Address Command
The Set Module Address command is used to change the
address of a 485SDD16. This commands requires one data byte.
This data byte is used to specify the module's new address.
Addresses can be assigned any decimal value from 0 to 255. The
address is stored in non-volatile memory and is effective
immediately. Each module must be assigned its own unique
address when connected to an RS-485 muti-node network.
Command: !{addr}SA
Argument: {new address}
Response: none
ASCII Example: !0SA9
Dec. Example: !0SA<57>
Hex. Example: !0SA<39>
Bin. Example: !0SA<00111001>
Description: Change module address from ASCII "0" (48 decimal) to
address ASCII "9" (57 decimal).
Set Turn-around Delay Command
The Set Turn-around Delay command sets the amount of time
the 485SDD16 waits before transmitting its response. This ensures
that no two drivers are enabled at the same time on a two-wire RS-
485 network. The turn-around delay is stored in non-volatile
memory. This command requires a data byte that specifies the turn-
around delay. Where {turn-around delay} is a number from 0 to 255.
One unit of turn-around is equal to one character transmission time.
The turn-around delay can be computed as follows:
character time = (1 / baud rate) * 10
turn-around delay = character time * data byte
Command: !{addr}SC
Argument: {turn-around delay}
Response: none
ASCII Example: !9SC♦
Dec. Example: !9SC<04>
Hex. Example: !9SC<04>
Bin. Example: !9SC<00000100>
Description: Set module 9's (decimal 57) turn-around delay to four
character transmission times (@ 9600 baud the turn-around delay =
4.17ms).
14 485SDD16-1005 Manual
B&B Electronics -- 707 Dayton Road -- Ottawa, IL 61350
PH (815) 433-5100 -- FAX (815) 433-5104
Define I/O Lines Command
The Define I/O Lines command is used to define each of the 16
I/O lines as either an input or an output. This command requires two
data bytes. Each data byte defines eight I/O lines. The first data
byte defines the eight most significant I/O lines (15 - 8). The second
data byte defines the eight least significant digital I/O lines (7 - 0). If
a bit position is set to a "0" then the I/O line will defined as an input.
If a bit position set to a "1" then the I/O line will be defined as an
output.
Command: !{addr}SD
Argument: {I/O msb}{I/O lsb}
Response: none
ASCII Example: !0SDUA
Dec. Example: !0SD<85><65>
Hex. Example: !0SD<55><41>
Bin. Example: !0SD<01010101><01000001>
Description: Define module 0's (decimal 48) I/O lines. The first byte
define I/O lines #14, 12, 10, & 8 as outputs and I/O lines #15, 13,
11, & 9 as inputs; the second byte define I/O lines #6, & 0 as outputs
and I/O lines #7, 5, 4, 3, 2, & 1 as inputs.
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