ALSTOM MFAC14K1AA0001A Channel output card

The baud rate is user selectable. However, the RSTL requires an 8-bit word, 1 stop, and 1 start bit for proper communications. There is no hardware handshaking, a properly received character will be echoed back over the RS232 line, assuming that the echo function is enabled. The default is to echo all characters, modifiable using the SET BACKTALK command: SB1 = echo on, SB0 = echo off. Since there is a finite amount of time required to perform a command, the user should not send a second command until the first command is complete. The unit is ready for the second command when bit 4 in the serial poll register is set.

The serial poll register is used as follows:

 b0 set = Not Used. b1 set = Not Used. b2 set = Not Used. b3 set = Not Used. b4 set = supply ready to accept commands, when this bit is set after a command the results of the command (e.g. MV results) are now in the output buffer. b5 set = Not Used. b6 set = service request sent. b7 set = power on initialization, reset by CLR or device clear finish. This bit simply indicates that the unit has been turned on. This bit is reset by a device clear command. If the bit then becomes set again, it is because the controller has reinitialized for some reason. As an alternative method, the RSTL is able to assert a service request upon the implementation of a command that results in some return message. The command "SQ1" will enable this feature, "SQ0" will disable it. The default is NO service request

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