9328900990 Rev L BE1-951 ASCII Command Interface 11-9
Configuring the Serial Port Communication Protocol
The serial communication protocol is defined with the SG-COM command shown below.
SG-COM Command
Purpose: Read/Set serial communications protocol
Syntax: SG-COM[#[={baud},A{addr},P{pglen},R{reply ack},X{XON ena}]]
Example: SG-COM0=9600 or SG-COM1=9600,A0,P24,R1,X1
Comments: Password Access Privilege G or Privilege S required to change settings
# = port number. (0 = Front, 1 = Rear 232, 2= Rear 485)
baud = baud rate (300/600/1200/2400/4800/9600/19K)
Ax = Address for polled operation where x = 0 (No polling) to 65534
Px = Page length (lines/pg) setting where x = 0 (No page mode) to 40
Rx = Reply acknowledgment level where x = 0 (disabled). 1 (enabled)
Xx = Xon/Xoff setting where X0 = handshake disabled, X1 = handshake enabled.
The following parameters pertain to relays using Modbus™ communication protocol at COM2:
MFx = ModbusTM extended precision format where x = 0 for floating point or 1 for triple
precision
MPx = ModbusTM parity where x = N (None), O (Odd) and E (Even).
MRx = ModbusTM remote delay time where x = 10(msec.) to 200(msec.).
MSx = ModbusTM stop bit where x = 1 for one stop bit or 2 for two stop bits.
If a non-zero address is programmed in the 'A' parameter, then the relay will ignore all commands that are
not preceded by its specific address. If an address of 0 is programmed, then the relay will respond with an
error message for any command preceded by an address.
If polling software sends a command preceded by an address of 0, then that command will be treated as
a global command. All relays will execute the command but no relay will respond to avoid bus contention.
NOTE: Polling is disabled on COM0 (Front RS-232), so an attempt to program an address other than A0
will cause an error message. The factory default settings are 9600,A0,P24,R1,X1 for COM0 and COM1,
and 9600, A0,P0,R1,X0 for COM2.
SG-COM0 Command Examples:
Example 1. Program front port for 1200 baud
>SG-COM0 = 1200
Example 2. Read the protocol setting for rear RS-485 port.
>SG-COM2
19K, A156,P0,R1,X0
Example 3. Read settings for all ports.
>SG-COM
SG-COM0=1200,P24,R1,X1
SG-COM1=9600,A0,P24,R1,X1
SG-COM2=19K,A156,P0,R1,X0
COMMAND SUMMARY
Miscellaneous Commands
ACCESS Command
Purpose: Read/Set Access level in order to change settings
Syntax: ACCESS[={password}]
Example: ACCESS=951
Reference: Section 11, ASCII Command Interface, Miscellaneous Command Descriptions
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