IAI America SSEL - Manual (Page 238)

216
Part 2 Programs
Read completes successfully within 30 seconds o Variable No. 1 = 0
Timeout occurs o Variable No. 1 = 1
* The return code of READ command may not be limited to 0 or 1. The variable to
store the return code can be set in “Other parameter No. 24.” Refer to the
explanation of READ command for details.