CCS/TMS320F28069: I am working with TMS320F28069, I need to Initialize CANopen how ro define the LAM (Local-Acceptance Masks (CANLAM))

Tool/software: Code Composer Studio

Hello Everyone

I have 2 Devices, both are Slaves(So I send 0x80 Heartbeat signal from a display)

both Devices sends candata: Device1: 0x181 , 0x281, 0x381, 0x481...Device2: 0x182 , 0x281, 0x382 0x482

I have 16 mailboxes as RX

this is the example code for masking

/* Define Local Acceptance Masks for rx mailboxes */
for(i=0;i<CAN_RX_MAILBOXES;i++)
{
p_lam_reg = &ECanaLAMRegs.LAM0 + i; /* pointer to every Local Acceptance Mask */

(*p_lam_reg).bit.LAMI = 0; /* only standard identifiers (as MBOX own identifier) */ /// LAMI = 1; when both standard and 11- bit extended
(*p_lam_reg).bit.LAM_L = 0x0000;
if(i > 12) /* mailboxes 13-15 */
(*p_lam_reg).bit.LAM_H = 0x0604; /* bits 0, 7 and 8 from 11-bit identifier are ignored */
/* valid for ID = 0x000 (NMT), 0x080 (sync) and 0x100 (time stamp) and 0x81 state change*/
else if (i > 9) /* mailboxes 10-12 */
(*p_lam_reg).bit.LAM_H = 0x0600; /* TPDO1 from node 99 */
else if (i < 6) /* mailboxes 0-5 */
(*p_lam_reg).bit.LAM_H = 0x1E04; /* only messages for this nodeID (bit 0 ignored) */
else /* mailboxes 6-9 */
(*p_lam_reg).bit.LAM_H = 0x0C00; /* only PDO1&2 messages for this nodeID */
}

I have not understood

why /* mailboxes 0-5 */

*p_lam_reg).bit.LAM_H = 0x1E04;... 0x1E04; what is this value from 0-5 mailboxes meaning

mailboxes 6-9 */
(*p_lam_reg).bit.LAM_H = 0x0C00;... 0x0C00; what is this value from 6-9 mailboxes meaning

mailboxes 10-12 */
(*p_lam_reg).bit.LAM_H = 0x0600;....0x0600 what is this value from 10-12 mailboxes meaning

mailboxes 13-15 */
(*p_lam_reg).bit.LAM_H = 0x0604;....0x0604what is this value from 13-15 mailboxes meaning

This Masking is working as to send the CANbus data to Display 

but now i want to make new masking to communicate between 2 Devices, I mean when Device1 sends candata should receive in devices 2 usinf canbus frames PDOS

like I can read 0x181 from device1 into device2 and from device2 0x182 into device1, so i wantt o make new masking but i want to understand how to read