Baldor mn1854 manual Serial Communications Problems

Additional Information Continued

Symptom	Possible Cause	Possible Remedies
“Unknown Command”	A command not in the command set	Check program for data entry errors.
	has been issued.
“Command Is Too	Command and parameter string	Reduce command string size.
Long”	exceeds 80 characters.
“Too Many Parame-	Parameter list exceeds amount	Reduce parameter list size.
ters”	supported by command.
“Invalid Parameter”	Parameter type is invalid.	Verify parameter with command syntax.
“Bad Command	Command and parameter list has	Check program for data entry errors.
Syntax”	invalid syntax.
“Too Many Nested	Program exceeds 16 nested loops.	Reduce nested loops.
LPs”
“Too Many Nested	Program exceeds 16 nested gosubs.	Reduce nested gosubs.
GSs”
“Too Many Nested	Program exceeds 16 nested IF	Reduce number of nested IF blocks.
EBs”	blocks.
“Bad Variable Name”	A variable used as a command	Verify variable name, or define variable with an initial value.
	parameter is undefined (misspelled).
“No Free Variables”	Attempted to define more than 100	Reduce number of user variables.
	user variables.

Serial Communications Problems

1.Test your terminal or terminal emulation software. Disconnect the motor and transmit a character. Receiving double characters (XX) when entering single characters (X), indicates your computer is set to the half duplex mode. Change to the full duplex mode.

2.Host transmit (TX) must be connected to receive (RX) of the drive unit, and receive (RX) of the host must be connected to transmit (TX) of the drive. If communication fails, try reversing these connections at either the host or the LinStep.

3.Many serial ports require handshaking. Jumper RTS to CTS, and DSR to DTR at host connector Jumpers 9 pin (25 pin) RTS to CTS 7 to 8 (4 to 5); DSR to DTR 4 to 6 (6 to 20).

4.Configure the host to the identical baud rate, number of data bits, number of stop bits, and parity.

5.Check all grounds. Use DC common or signal ground as your reference. Do not use earth ground or shield.

6.Check your cable length. If any cable is over 50 ft. long, you should be using a line driver, optical coupler, or shield. Shields must be connected to earth ground at one end only.

MN1854 Troubleshooting 7-3