为什么他不能结束接受，他不结束接受就不能发送怎么办？
main
LD SM0.1
MOVB 2#10001, SMB30
MOVB 99, VB300
ATCH INT_1:INT1, 9
ATCH INT_0:INT0, 23
ENI
XMT VB300, 0

LD SM0.0
CALL SBR_0:SBR0

sbr_0
LD SM0.0
MOVB IB0, MB0
MOVB MB0, VB302
MOVB '?', VB399
MOVB '>', VB301

LD SM0.0
AB= SMB86, 0
= Q1.7

int_0
LD SM0.0
S SM87.7, 0
XMT VB300, 0
int_1
LD SM0.1
MOVB 2#11000110, SMB87
MOVB '?', SMB89
MOVB '>', SMB88
MOVB 50, SMB92
MOVB 255, SMB94
MOVB 99, VB100

LD SM0.0
S SM87.7, 1
= Q1.5
RCV VB100, 0