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Troubleshooting 7-3MN1854
Additional Information Continued
Symptom Possible Cause Possible Remedies
“Unknown Command” A command not in the command set
has been issued.
Check program for data entry errors.
“Command Is Too
Long”
Command and parameter string
exceeds 80 characters.
Reduce command string size.
“Too Many Parame-
ters”
Parameter list exceeds amount
supported by command.
Reduce parameter list size.
“Invalid Parameter” Parameter type is invalid. Verify parameter with command syntax.
“Bad Command
Syntax”
Command and parameter list has
invalid syntax.
Check program for data entry errors.
“Too Many Nested
LPs”
Program exceeds 16 nested loops. Reduce nested loops.
“Too Many Nested
GSs”
Program exceeds 16 nested gosubs. Reduce nested gosubs.
“Too Many Nested
EBs”
Program exceeds 16 nested IF
blocks.
Reduce number of nested IF blocks.
“Bad Variable Name” A variable used as a command
parameter is undefined (misspelled).
Verify variable name, or define variable with an initial value.
“No Free Variables” Attempted to define more than 100
user variables.
Reduce number of 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.